Mercedes 560SEL MY 86/91 Idle Speed Adjustment Tutorial Part 2

Mercedes 560SEL MY 86/91 Idle Speed Adjustment Tutorial Part 2 - adjusting ISCV high idle when warm

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2 жыл бұрын

Пікірлер: 27

@asarnth 17 күн бұрын

Very good well illustrated video! I have an 85 380SL and am having problem with intermit issue with high idle and wondering if you can assist me. After a good cleaning I bench test the ICV and seems to be working normal with the open and close when I applied 4 volts on my power supply unit. But it only shows .49 amps. After install it back on the engine and it started fine with idle normal around 750 rpm. When engine start getting hot, the rpm starts climbing to about 1400 rpm and few minutes later it went back down to normal. A few minutes later the rpm start climbing again. I tested the voltage on each cycle by disconnected the two prongs female connector when it idles at normal and it read about 4 volts. The rpm climbed when I disconnected and went back down to normal when plugged it back in. I did the same testing when it idles at 1400 rpm for few minutes. At high idle, the female connector reads 12-13 volts. Although, disconnect and reconnect the power at high idle does not effect the rpm. I repeated the testing for few times and each time it has the same affect. I assumed the high voltage put the ICV to the open position causing high idle. Should the input power to the ICV stay at around 4 volts after engine warmed up? Could this be an issue with ICM?

@VegasMikeP229 5 ай бұрын

Great video!! Do you know these Idle Control Valves (ICV) are repairable? If the valve gets sticky, brake cleaner will help quite a lot. The other failure I've found is the internal wires break between a pin and the solenoid inside the aluminum housing. I think the solenoid reads around 6 ohms, and an Open (infinite) reading tells you it's broken inside. Unsolder the wires in the pins and get them loose. Dremel cut the bent / rolled part of the case holding the plastic connector in place and remove the black plastic connector with the pins. Solder a new wire to the broken one inside the case and feed it back out through a pin. I used JB Weld epoxy to hold that black plastic piece back in the aluminum housing, then resolder the wires to the pins. Drive away...

@grungedude2 2 жыл бұрын

Excellent video, thank you.

@EmilianoCaballeroFraccaroli Жыл бұрын

Great video.

@lpeterssen Жыл бұрын

I am making a wiring harness for a custom project. This is a w113-230SL with a 560SL R107 engine and transmission. The only signal I have not been able to direct to appropriate place is the SPEED INPUT coming out of the electronic speedometer to CIS-E and IDDLE CONTROLLER

@inovahightechltd Жыл бұрын

The W113 didn’t have the Hall effect circuit to generate the speed signal on the odometer like the W126 You may want to check the cruise control controller and see how this unit gets its speed signal in the W113 On the W126 the speed signal is a 50/50 duty cycle pulse of about 10V+ The frequency is directly proportional to measured speed. From my measurements on the MY89 W126 560SEL 30 - 40 miles equates to a frequency off ~ 85Hz kzfaq.info/get/bejne/oal3i7J82N-8qY0.html

@limyrob1383 2 жыл бұрын

Very helpful. The ICV on my 92 500SL failed and the replacements were £625 so I fitted one of these units (aftermarket) which cost £28 (about $35). The side port is larger on the R129 but a short piece of heater hose is exactly the right dia to make this fit. With this ICV the R129 idled at 1200 so I made this adjustment and it now idles steady at 600.

@inovahightechltd 2 жыл бұрын

@Rob Miles Hi Rob, That’s interesting and good to know. I tried one of those aftermarket units back in January and on the 560 the engine would rev up to 1400 and then then drop down and the engine died. I tried to adjust the spring, but on this Chinese / eBay version I had bought, there was no brass guide to be pulled in or out to adjust. Could you please tell us where you obtained your ICV? Unfortunately KZfaq users cannot post links in the comments section due to spam issues Thanks Peter

@inovahightechltd 2 жыл бұрын

Rob, just saw you posted a comment which was immediately removed by KZfaq. I guess it contained a link. Please try to repost it without the link. I will try to google it

@limyrob1383 2 жыл бұрын

@@inovahightechltd OK that's very odd, I didn't put a link in. I'll try the main text again. 2 of us had the same very high -2000 rpm idle on 92 R129 500SL. The R129 uses a special ICV with an oval port, crazy since the manifold ports are round and the same size as the 107/126. The aftermarket ICVs fit with some heater hose to pack out to the oval rubber boot (that actually is circular!). With the cheap ICV the engine idles at 1200 but is correct in every other way so pulling the sleeve out 2 - 3 mm brings the idle to 600. The cheap ICVs are sticky (poor tolerances?) but do settle to a steady rpm.

@limyrob1383 2 жыл бұрын

OK youtube has just deleted my 2 last posts.

@inovahightechltd 2 жыл бұрын

Hi Rob, thanks for the update. That leaves us only with the question of which one of the cheap ICV’s u actually bought. There are three Chinese version/manufacture of this ICV

@r3FMusic 2 жыл бұрын

Thanks..

@lpeterssen Жыл бұрын

What happens if CIS-E ECU and IDDLE CONTROLLER does no receive SPEED SIGNAL INPUT from electronic speedometer

@inovahightechltd Жыл бұрын

Not sure, I have to check and see what symptoms that would cause

@charlestimmis273 Жыл бұрын

Hi Peter, my car starts when cold immediately at about 750RPM, then a bit later it goes down to maybe 650RPM. I cleaned the ICV and new temp sensors. what is the correct high idle warm up procedure. Should it not be around 1100RPM when cold? Thanks

@inovahightechltd Жыл бұрын

Hi Charles, The initial idle rpm depends on the coolant temperature. When the engine / coolant temperature is above 50C when started or on a hot day it should go up to about 1200 When cold 🥶 then the rpm will start around 550 and then go up to about 800 900 and then drop down to normal idle after a maximum of 90 seconds (the colder the longer)

@charlestimmis273 Жыл бұрын

@@inovahightechltd Hi Peter: I always thought that the RPM will start higher when cold and not vice versa? in any case , I think my car always starts around 750-850 RPM no matter what is the temp. anything to look at like idle control unit? Thanks

@inovahightechltd Жыл бұрын

It really depends of what your ambient temperature is. The coolant will always taken on the ambient air temperature when the car sits. So we have to separate this. A start after the car sat for several hours / days and coolant is at air temperature or if the engine is started while it still has residual heat say like between anything higher then ambient to 80/85 C Now on top of this, there were at least 4 different revisions (and part numbers) of the Idle speed control unit and each one does the start a bit different

@inovahightechltd Жыл бұрын

@@charlestimmis273 to sum it up: Your engine starts good and immediately when cranking and you wind up at regular idle after a little while then I wouldn’t worry about it

@EmilianoCaballeroFraccaroli Жыл бұрын

From what I understand after watching your videos. When adjusting the idle control valve and the module, we can measure in the bench how much current the valve needs to be fully closed. How can we make sure the ICM (module) outputs the neccesary current? can we measure the current the module outputs in the connector of the idle control valve? thank you

@inovahightechltd Жыл бұрын

The ICM has only a maximum output of 1000 mA That’s why you need to adjust the ICV so it closes around the mA I suggest in the video. When the ICV age they need more current to close, so you adjust the spring tension and it will work like before

@EmilianoCaballeroFraccaroli Жыл бұрын

@@inovahightechltd Thank you! Since it's really hard to find new ICM, I just want to see how to test these 'refurbished' ICM modules that are available on ebay. I think if we measure current in the connector of the ICV should give us an idea of the ICM working fine or not?

@raymondroux9846 Ай бұрын

I have a R129 500sl 119 engine. Idles high when hot can that be sorted by adjusting the valve as shown

@inovahightechltd Ай бұрын

@raymondroux9846 not sure, unless the idle control valve is 100% identical to the one shown in the video