Nissan Frontier - Low / No Power Complaint

Рет қаралды 512,062

7 жыл бұрын

Come along with Eric O. at the SMA shop as he looks into this "low power" complaint on this Nissan Frontier Pickup. We also get to bust out the Pico Scope to aid us in our diagnostic and learn how it can tell if the exhaust is plugged.
How to check back pressure: • Exhaust Back Pressure ...
A look in the cat: • Exhaust Back Pressure ...
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair.

Пікірлер: 774

@fromstarlighttosunrise128 5 жыл бұрын

they used to make this really good catalytic converter cleaner back in the day. i believe it was called “Screwdriver and Hammer”

@outbackcountry512 5 жыл бұрын

Yup, just sold a infinit Qx4 , former owner conducted that surgery B4 I owned it , problem solved

@hahnmowermotorsports179 5 жыл бұрын

I always use one called “drill and auger bit.” Works great

@jesusofmalibu4946 4 жыл бұрын

I picked up some new old stock of that the other day works like a champ.

@pospc2 4 жыл бұрын

@@hahnmowermotorsports179 thats a great one. I used that product before. Works like a champ. Also used it combined with screw driver and hammer cleaner to make sure it was sparkling clean.

@joepellish5380 3 жыл бұрын

Hey! About 4 years ago here in Armstrong County PA I used a similar cleaner to what you guys used on my old 2004 silverado pickup. I believe it was called "sawzall, exhaust tube bender, and straight pipe". Kind of a weird name for a cleaner but it worked better than ever and sure cleaned her out. Only one cat was plugged (there is one on each bank of the 6.0 v8) so the truck was running really really weird. Also I was able to use the "hp tuners" "tune up" software to take care of my new false check engine light that came on because I used this cleaner. Took care of that and actually plugged the truck into my friends emission machine and it passed! Yes is passed after that!! That tune up software really works!!!!

@chrisrentas6471 3 жыл бұрын

This man is incredibly smart. His test equipment is top notch. He is smarter than most engineers ! Thank you so much !!

@mbarry9737 7 жыл бұрын

Thanks for showing the scope and in-cyl transducer analysis. Very informative.

@DJSekuHusky 4 жыл бұрын

I just wanted to say thanks, I watch your channel quite often. I recently acquired a $550 "towyard-special" 2001 Xterra with a KA24DE. It was running terribly and I was able to identify a blocked upstream catalytic converter with the aid of this video. $95 for an eBay cat and no more CEL. Keep up the excellent work bud.

@donnlowe9129 5 жыл бұрын

Another excellent video. Your ability to diagnose mechanical problems is amazing every video it's like a shop class. I'm 72 and have known a lot of good mechanics but I think you are probably the best I've seen!

@dufus2273 4 жыл бұрын

don't give him a big head. lol

@billyshannon6454 5 жыл бұрын

I love your explanation for how you analyze your customer and their actions in order to better diagnose their concern.

@malcommooney8086 3 жыл бұрын

And off camera he treats them like the a-wholes they are

@fredmyers120 4 жыл бұрын

Excellent example of proper diagnostic technique. You guys do it right and don't just trust intuition, you go for the data and the facts well done

@smc9764 7 жыл бұрын

Hey Eric O. Just want to say your channel is awesome and I'm constantly looking to see if you put any new videos out! You're a great dude. I also broke my foot recently after finishing a timing belt on my A4 3.0 Audi, so I been holed up on the couch. At least I can spend my recovery learning some new stuff! Thanks for all you do!

@jhauna1 7 жыл бұрын

Like your practical approach and how you integrate the tools without an over kill... good work dude!

@SouthMainAuto 7 жыл бұрын

Thanks Man!

@lichin11 6 жыл бұрын

General comment, I really love your videos and the detailed explanations provided. Thank you for doing all the work it takes to produce these!

@Anibal92234 7 жыл бұрын

Always right on time when i go to youtube! Always happy when i see SMA video good job eric o!

@camp_moto_asmr 5 жыл бұрын

Thank you for making these videos, you make me smarter every day

@axeman6560 5 жыл бұрын

Great to see all of these different faults you can fix this is real mechanic at work. Great channel. New sub.

@63256325N 5 жыл бұрын

Plugged exhaust was my guess having watched one of your videos of a vehicle with the same symptoms. Thanks for the video.

@johnmckamy6398 7 жыл бұрын

you know its gonna be a good day when you can start it with a SMA video

@kyferez1 3 жыл бұрын

I absolutely LOVE how you make your decisions based upon data! You are the best automotive tech I've seen. I WISH ALL automotive techs had your level of professionalism and data-driven decision making processes. From now on I'm going to request factual proof from any auto tech looking at my car before approving any repair. From your videos, it's clear the data can be provided. You know what I would love to see from you? A collection of videos where you publish known automotive issues and how to identify them based upon the OBD2 or CAN bus data. Please please please do something like that!

@TheMowgus 5 жыл бұрын

Very cool to see how the testing changed your initial assumption and confirmed the cause. Lots of shops would have thrown a fuel pump on and charged you for it despite it not fixing the problem. Good job!

@tiredoldmechanic1791 5 жыл бұрын

In the old days, we diagnosed a restricted exhaust with a simple vacuum gauge. Start at idle and slowly bring the throttle up. The vacuum should go up as engine rpm increases. If it goes down, the exhaust is restricted.

@darrellarrowood465 5 жыл бұрын

Nice find, all your vids are super helpful and appreciated

@workingshlub8861 7 жыл бұрын

i remember my younger days blowing the converter in my camaro......no power and it would overheat after 5 minutes after startup...the fact that i was constantly flooring did not help either.. expensive lesson lol. once again good diagnosis eric.

@craig9802 5 жыл бұрын

That is the cleanest Frontier engine bay I've ever seen, by far.

@R.E.HILL_ 7 жыл бұрын

I like your diagnostic approach. And that you choose a noninvasive solution to confirm. thx for sharing.

@bmw-e30 7 жыл бұрын

Fresh off the hook, no beans---love the lingo.

@peterpratley9973 2 жыл бұрын

I just starte4d watchina g your videos recently. I am 75 years old and my very first car was a 1955 Chevy with a 265 V8 which burned oil so In decided to tear the engine apart and relace the rings. I got most of my tools from Sears and parts by mail from J C Whitney catalogs. In 1963 that was the equal to Amazon today for cars and truck parts. I got it done and all reaasmbled but Im ended up with 2 bolts left over. Not a clue where from. The car ran well for a while but then started to burn oil again. So I took everything apart again and found out that I left the 2 bolts off the main bearing cap on the crankahaft. Solved the mystery of the 2 extra bolts. I enjoy watching auto repair videos but the electronics lose me. Keep up the good videos Pete

@Tenright77 6 жыл бұрын

Had a similar failure on a Ford V6 Escape, front maniverter came apart internally, clogged the down stream cat. Caused the plastic oem EGR to blow off as well as the no throttle response symptom. OBD showed misfire on two front cylinders. Thanks Eric.

@johnmckamy6398 6 жыл бұрын

I like video's that contain good information and nobody gets called a moron .thanks Eric O.

@donaldisrael7147 7 жыл бұрын

I learned a lot about exhaust restrictions on a 73 Buick. Special tool-hacksaw. Collapsed inner wall of exhaust pipe.

@wrenching5483 Жыл бұрын

Awesome troubleshooting. Excellent tooling. Top notch mechanic man. Impressive

@davidsewell3477 5 жыл бұрын

Hi Eric you probably know this . but i just double the Celsius and add 28 . always gets me near . Keep up the Excellent work. Dave from England

@Sandbag1300 7 жыл бұрын

14:39, "That is super cool." Yes it is! Yet another double thumbs up SMA video and terrific "plug" for Pico.

@SouthMainAuto 7 жыл бұрын

Hey , jsut use what works the best :D

@klrmoto 2 жыл бұрын

My first view of your channel. Thank you so very much for showing me how things are done these days.

@OneAuto 7 жыл бұрын

Great way of proving the back pressure with the transducer. #testnotguess Happy Easter Eric!

@chrisboucher9916 3 жыл бұрын

i thought i knew a lot about cars till i started watching you. you're very good

@stormshockin 5 жыл бұрын

Man, those muffler bearings sound shot as hell

@djmajiktuch82 4 жыл бұрын

Yup i can hear rhem rattling around in there.😁

@gwhizz44 Жыл бұрын

I've had the exact problem except it was the header piped delaminated on the inside. Love your channel Eric O.

@trainer2018 7 жыл бұрын

You are gonna love the wps 500 Eric. Awesome tool. I use mine quite a bit to determine if I have inadequate fuel pressure on the low side on our buses.

@SouthMainAuto 7 жыл бұрын

Yeah I have had mine for a bit and have been enjoying it

@george536 4 жыл бұрын

When you take a measurement when you were trying to reach zero on the pico, you can just type in “0” on the measurement box after you pull it down and it will go automatically

@JeffBrown1966 5 жыл бұрын

Thank you, I learn so much from your videos.

@halleffect1 7 жыл бұрын

Hi Eric, thanks for the upload. If you get the job and have time, please do another waveform and temp check. I'm curious to see good numbers for this truck.

@levijnkins4657 4 жыл бұрын

My first test on a car with this similar issue is is take it down the road. Give it gas tell it starts choking out and pop in in neutral will my foot still on the gas. If the rpms go up it’s most likely a fuel delivery issue. If not looking more like catalytic converter. Great work! Love the videos

@giuliom8520 4 жыл бұрын

Great video! Fancy Shmancy computer work! I would've thought it was a dirty air filter.

@mrmatt7210 5 жыл бұрын

Eric was excellent in diagnosing a bad catalytic converter. With this in mind, there are two points which may be of assistance to viewers of this video which are having a similar problem. First, the rattle noise heard coming from the exhaust is most likely the heat shield on the front catalytic converter. Over time, the heat shield will become loose and deliver the "Nissan Rattle". In such a case, a stainless hose clamp placed at the appropriate spot will remove this noise. Secondly, you may have a vehicle which still has a warranty in place. Though your vehicle is outside of the standard 5yr/60,000 mile factory warranty, converters are covered by an emission control warranty for 8 years or 80,000 miles. Dont spend a fortune on a repair if you dont have to.

@christinehucklebridge1534 6 жыл бұрын

yes, we appreciate these informative videos. good diag on the nissan.

@jamesdayton9530 7 жыл бұрын

Good Video. Your explanation as right on and I learned something today. THANKS

@tsakanendzimandze7264 5 жыл бұрын

@Mizman76 5 жыл бұрын

I said(out loud) to my phone "Plugged cat" at 0:38 of the video. I'm not a mechanic,per se,but had plenty of experience with plugged cats. Bought my first brand new vehicle in 1998,a 3.9L Dakota sport pick-up. It had a total of 83,000 miles when I traded it in and had been thru 5 CATALYTIC CONVERTERS. Exact same symptoms as this truck but with enhanced rattle. Went out every 15,000 almost to the mile! Didnt find out why,didnt really care. Got rid of that POS and never looked back! Enjoy your videos!

@50sKid 7 жыл бұрын

Another great one, thanks.

@mike-yp1uk 7 жыл бұрын

pico scoping is awesome. you can also hook up a cheap vacuum gauge and show us some mc giver stuff. was all that rattling coming from the converter. should have taken 2 more minutes and pulled it off and give us guys a picture ha ha. you are an awesome mechanic thanks for showing us some of you work. i bet your an aitn member. keep up the good work and may the Lord bless you in all you do.

@Soothsayer-rs5nb 5 жыл бұрын

Love the scanner info but you can diagnose a clogged exhaust with a vacuum gauge also

@pnwtundra07 7 жыл бұрын

here it is 2am in the pnw i should be sleeping when i get a notification of a new sma video lol

@rosscharlie5349 7 жыл бұрын

You have your priorities right brother .What can I say LOL Daz UK

@michaelstoliker971 7 жыл бұрын

That pressure sensor is awesome. I wish we had those back in the 70s/80s.

@baxrok2. 7 жыл бұрын

Damn, that Picoscope is worth every penny. Sweet diag Eric. Thanks!!

@SouthMainAuto 7 жыл бұрын

Sure is man! Thanks!

@weldingjunkie 5 жыл бұрын

900 bucks idk lol

@moparmania86 7 жыл бұрын

Eric I like to use a vacuum gauge to diagnose a plugged exhaust. Then remove 02 sensors and see when the power output comes back. Thats how I figure out which one is plugged.

@mericafreedomland3583 5 жыл бұрын

This is by far thee most interesting video ive seen in a long time, the data logging and all is soooo fricken cool

@geoffrwelsh 7 жыл бұрын

know of a couple cases on these 4.0 where not only did the front cats come apart, but the back pressure forced particles back-up into the cylinders causing valve and piston damage (on iATN). These guys were fortunate.

@emtscythe3782 7 жыл бұрын

Eric.. Just FYI The Felpro ES72481 Spark-plug tube seal kit fit almost all of the Nissan valve covers. I have used them numerous times. They cross reference for the 3.5 engines in the Altima's but they fit and seal perfectly on almost all of them.

@MyassesDragon 7 жыл бұрын

Remember the good ole days when you lifted the hood and you could actually see an engine?

@SouthMainAuto 7 жыл бұрын

haha what's an engine look like again!?

@siriusjones6719 6 жыл бұрын

Good ole days when you had to change points and set lash with a tune up? When cars didn't start right up on cold mornings? Good ole 4 wheel drum brakes that took half a block to get the vehicle stopped? Yes, under hood is a bit cluttered these days but I, for one, don't miss setting valve lash, toying with manual choke carburetors every morning, and and trying to get the drum brakes to balance from side to side so when you hit the pedal it doesn't jerk one way or the other.

@BreadAndGatorade 6 жыл бұрын

Sirius Jones just bought my new (used) car largely because it had 4 wheel disc vs the rear drum on the competition. There were other factors but man do drum brakes suck if you are not the proverbial sunday grandma driver

@felipelonestar9588 5 жыл бұрын

Yeah I saw mine when I opened the hood today

@pupupipichorrorelief4909 5 жыл бұрын

your old

@theadventuresofjavier8698 7 жыл бұрын

nice of you to serve it up fresh Mr. O.

@gordonfreeman5434 7 жыл бұрын

Love the SMA diagnostic videos.

@SouthMainAuto 7 жыл бұрын

Thanks Gordon

@thebeardedone1225 5 жыл бұрын

When you started it up, I heard that clanging and instantly thought, cat heat shield rattling, must be a clogged cat. Time to sharpen up a piece of conduit, and grab a hammer. lol

@HayesTech 4 жыл бұрын

I had a similar issue with my 2012 Nissan Frontier with the 4.0 liter engine. They replaced many parts at the used auto service department and still couldn't fix the issue. Issue: loss of power out of the blue and when engine would warm up. No engine check light. Engine thermostat was reading high but not in the red. To make a long story short, the Nissan garage had it for about 15 minutes and found it was a bad thermostat. Because it was overheating, but not in the red (danger zone) the system would cut power to the engine so it wouldn't destroy itself. Great video. I would just tell people to make sure and take your vehicles to a reputable mechanic. I was without my almost new truck for about a month and a half because the service department at the dealership couldn't diagnose a simple problem.

@npfd568rc 7 жыл бұрын

Cheaper than I thought.well that's good news for the owner.good luck,looks like it is going to be a fun one to do.

@kevinmartin9432 5 жыл бұрын

In the good ole days before OBD etc, we used to rev it up, switch off and listen. If you listen carefully at 13.47 you can hear the exhaust gasses hissing as they escape.

@jefferypowell9885 3 жыл бұрын

some of the best work ive seen

@roylwchez 7 жыл бұрын

is it possible this customer fell for the ol banana in the tail pipe

@Bud-stearns 4 жыл бұрын

My Nissan did the same exact thing. I thought it was bad gas too. I was 200 miles away from home and had to drive it with barely any power and missfiring like hell. Finally got it cleaned and now it runs perfect

@Bacha58 5 жыл бұрын

I thought so now I am sure. Thanks for great explanations.

@ncrdisabled 7 жыл бұрын

Yep I live in the catskills ny about 95 miles up from NYC. We get folks from down there come up to the local junk yards and grab a cat from there . we have 3 yards with in 60 miles from me .There was a shop that would cut them out by the pipe method but you have to register it in NJ to pass the inspection

@richardwallinger1683 4 жыл бұрын

great bit of diagnosing .. like you say a mystry on why it suddenly went bad.

@V10PDTDI 7 жыл бұрын

The first thing I heard at the beginning of the video when you were showing us the way the engine sounded like that rattle sound I knew that it could have a bad catalytic converter so I will resume to watch the rest of the video to see if I'm right.

@charleskaber9429 7 жыл бұрын

V10PDTDI

@Justin109MWC 6 жыл бұрын

You are 110% right

@MrPami9899 6 жыл бұрын

V10PDTDI exactly what I thought one he started it

@Lindenbum 5 жыл бұрын

V10PDTDI that was exactly my thought bad cat

@richo662 5 жыл бұрын

@@Lindenbum me too

@Sebastianx115 3 жыл бұрын

Thanks helped me diagnose a 17 frontier with p0304 same problem

@danmackintosh6325 6 жыл бұрын

It was even audible after you shut the engine off, the hiss of the pressure escaping. (obviously could also have been AC low on gas/evap purging or similar so wise to diagnose with the scope and pyro too). First time I've heard of it occurring suddenly though like you say, normally takes a while and in my experience usually plugs up the back box. Wonder what state the 2nd cat was in, too, having been bombarded with chunks of porcelain?

@skokie23 7 жыл бұрын

"Fresh off the hook" Awesome line!! Great Vid!!

@SouthMainAuto 7 жыл бұрын

tow them in and get'em while their hot!

@dosbox907 7 жыл бұрын

man, I need to get one of those scanners. I'm an aspiring mechanic, I currently work for myself and do a a lot of side jobs, usually doing work for people in their driveways. and it blows my mind how quick you got that thing diagnosed, just chilling in the driver seat!! haha! I feel like I'm in the damn stone age. it would took me forever to figure that out! anyways, you sir are hands down my favorite KZfaq mechanic. I look forward to the day where I'm almost half as , skilled as you m8. keep up the Vids man. you are doing god's work. I'll be watching.

@brucesheehe6305 3 жыл бұрын

I really enjoy this channel.

@djhaloeight 5 жыл бұрын

As soon as I heard the engine sound when it was being revved up, I thought plugged catalytic converter. I’ve heard other motors with that problem and it sounded exactly the same.

@NeverEnoughPyro40 3 жыл бұрын

There are other ways to check for bad cats without running the engine which could cause some major issues!

@brianeighties4481 3 жыл бұрын

Should have a p0420 code well before the cat gets too bad to drive probably something like a mass air flow meter just guessing because I haven’t finished the video.

@zfoxfire 3 жыл бұрын

Interesting to see what goes into troubleshooting modern cars.

@WCGwkf 4 жыл бұрын

My immediate thought was plugged cat or plugged exhaust then you said fuel pump and I was disappointed. But now your data makes you think exhaust.. still watching hope I'm right!

@Dannerrrr 5 жыл бұрын

I thought it would be timing related, like the timing pulley jumped a bunch. I learned something!

@westtexas501 7 жыл бұрын

When you purchase the pico does it come with a tutorial on the basics how to set everything up ?

@DevoldoinHD 5 жыл бұрын

I'm assuming they never did have you replace the converter. Was curious what the old one looked like inside. Bet they took it to some backwoods shop and they simply shoved a pipe through it.

@SeersantLoom 5 жыл бұрын

My repairman told me to floor it from time to time, just to blow the converter. Have not had any converter problems (no plugging or emission inspection fails) so far.

@tomb375 5 жыл бұрын

Excellent Call, Great wok.

@avenger1888 5 жыл бұрын

Mr O of South main auto . What are the common problems of the Nissan Frontier? I looking at possibly purchasing a Nissan Frontier Pro 4 X the 2018 or possibly 2019. Crew cab Your thoughts on this Make and model?

@The3rdCoat 4 жыл бұрын

I ended up with the same issue some time ago when i ran over a big rock and damaged the converter. Over the next few months, gradual loss of power, not major but certainly noticeable. Engine light never came on cos it's an lpg vehicle, has no downstream oxygen sensor. A thought, Wouldn't you be able to check for exhaust restriction just using intake vacuum readings from the scantool? I think there's some kind of a test for it.

@WrenchingOnCars 7 жыл бұрын

I'm surprised that there was no converter efficiency check engine light. I also miss the brake clean thing.

@spelunkerd 7 жыл бұрын

Wow, what a neat way to show an obstructed exhaust.

@n78966969696896 3 жыл бұрын

Before you even tested it I figured that's what it was.. I have a v6 pathfinder of the same era and I have replaced.... All.. 4.. catalytic converters (with cheap ass ones that'll probably only last a few years). Those O2 and AFR's are actually pretty stout on these. I took mine off about 5 times and it was tough the first time but not horrible.

@5jjt 5 жыл бұрын

@ 6:30, what is , "AFR" & what were the values that showed "rich" fuel mixture on hard throttle? I'm trying to learn. Any help would be appreciated. Also, I was watching B1S2 o2 values and noticed the voltage wasn't flip-flopping like o2 sensors normally do. Any insight?

@ryego3 5 жыл бұрын

Afr is air fuel ratio for gasoline "ideal" is ~14.7:1 (14.7 units of air to 1 unit of fuel). So anything lower is "rich" meaning too much fuel anything higher is "lean" meaning too little fuel. There's benefits to running a little bit on either side but too far either way and you can't support a combustion reaction anymore.

@5jjt 4 жыл бұрын

@@ryego3 Thanks ryego3. YT didn't notify me when you answered my question. I'm only seeing it now after rewatching the video. Thanks for sharing your knowledge!

@CVD-di1xn 7 жыл бұрын

Good catch. Make sure you do a follow up video. I want to see you cut the cat open. Once again, I've learned something. Thanks, Dave at Hamburg.

@SouthMainAuto 7 жыл бұрын

Wish I could but it had a $200 core charge on it :(

@mattltech 5 жыл бұрын

Awesome thanks! Subscribed.

@Paul1958R 7 жыл бұрын

Another great video Mr O. Ive never seen a cylinder pressure tester being used - very informative. Thank you. I believe Mfrs must warranty catcons for 8 years / 80K miles. Not sure if this truck would meet either of those limits. Paul

@SouthMainAuto 7 жыл бұрын

Nope this truck is out side the Fed Warranty :(

@hawkertyphoon4537 4 жыл бұрын

starving for fuel, pump not delivering or (suddenly?!!) clogged filter was my guess ... no, he looks at gasses... pressures... Thank you for the lesson!

@opl500 7 жыл бұрын

So he's got a special performance reducing exhaust?

@ralfie8801 4 жыл бұрын

opl500 Ordered in all the way from Calizuela!

@moeshouse575 5 жыл бұрын

my 2016 frontier V6 auto trans. when i turn it off the sheet metal around the ext pipes makes a noise as it cools off. strange i had a 1964 dodge 880 make same noise. but no cats on that one.

@amadorpiscoya 6 жыл бұрын

Good job u are the best

@DaylightDarknes 7 жыл бұрын

I literally said out loud to myself "plugged cat" as soon as you said there was no MIL. Was 100% sure when you said it had P0300 and 0303 pending lol.

@thomascoolidge2161 5 жыл бұрын

The ceramic inside a catalytic converter is made from fragile material. It is typically protected by an insulating mat. This mat holds the catalyst in place and provides moderate protection against damage. However when anything strikes the converter or a broken exhaust system support can cause this catalytic material to fracture. Once the ceramic catalyst is fractured, the broken pieces become loose and rattle around and break up into smaller pieces. Flow is interrupted and backpressure in the exhaust system increases. This leads to heat build up and loss of power.

@salvadordlicon9467 7 жыл бұрын

New word. Catafold. Good video Eric. Expensive repair. Lol!!!

@SouthMainAuto 7 жыл бұрын

around 500 for the parts OEM

@sledgehammer6759 7 жыл бұрын

So that's how you check a cat , I will get me one of those temp. guns . Great video .

@SouthMainAuto 7 жыл бұрын

well not a 100% way to do it

@Usmanthemecano 7 жыл бұрын

So Eric for us who do not have access to fancy equipment can we just measure the temp on both the inlet and outlet of the cat and call it? what readings are we to look for for a failing cat?