Mercedes W126 all MY 4.2 & 5.6L - how to adjust idle speed air valve to close fully at 1 A Tutorial

Рет қаралды 12,918

2 жыл бұрын

Testing and adjusting of two idle speed air valves which where both bought on eBay. One good and in excellent condition and ideal for adjustment and the other ready for the trash bin.
This is a direct comparison of these two valves side by side where both brass inserts are pulled out to be flat with valve housing and the current they will draw to close the valve fully

Пікірлер: 32

@DavidLonardelli-tf8bd Жыл бұрын

Thank you so much. Just what I needed for my 1990 sl500 r129 series 5.0 l V8. That's awesome I have a high idle on a brand new idle control valve it could not be adjusted right or it could be the overlimit voltage relay I ordered one of those two just to make sure but that's an awesome demonstration that you did I really appreciate it it's exactly and I mean exactly what I needed to see.

@GinoOLongo Жыл бұрын

On point. Great way to test and adjust the ICV. For those of you watching this having ICV issues, you also need to check the voltage sent to the ICV from the Idle Control Unit. Should read 12 volts when the engine is first turn on then around 5 volts once the engine reaches operating temperature. If this is not the case, then the ICU should be checked or replaced.

@EmilianoCaballeroFraccaroli Жыл бұрын

I have read that it should be 12v with engine off and ignition on . Correct ?

@inovahightechltd Жыл бұрын

Depends on model / engine / my The control is PWM so current is relevant, not voltage Maximum current control unit can supply is 1000 mA

@EmilianoCaballeroFraccaroli Жыл бұрын

@@inovahightechltd mine is a 560SL 1986. I don’t have an external power supply to measure that. Can I connect the icv to its power socket in the engine with key on ignition ? Will that provide me with enough current 1Amp? Thank you

@inovahightechltd Жыл бұрын

No, this test / adjustment can only be done outside the car on a test bench

@EmilianoCaballeroFraccaroli Жыл бұрын

@@inovahightechltd thanks!

@georgesand4629 2 жыл бұрын

Hi on the 420SEL the bypass tube is closed on one end. I don't understand my MBZ would do this. Since you have a 560 it is open on both ends. I made the mistake of cutting mine . So I make a aluminum tube and and flattened one end to close it.

@cwmoser 2 жыл бұрын

Looks to me like we need 4v at 1amp fully closed. P=IE = 1x4 = 4watts of power to energize the coil in order to close the flap. Or measure the resistance of the coil and ignore voltage and just deal with the current ... R=E/I = 4 ohms. P=I*I*R = 1*1*4 = 4watts

@Sha_7184 Жыл бұрын

I have 1992 SL500 lately she has been idling in park mode at 2RPM’S fuel pressure Distributor also leaking slightly any recommendation please I was told it is. My Air idle Valve also car stutters from take off in drive mode till about 5-10 miles per hour

@inovahightechltd Жыл бұрын

Recommendation: Watch all my videos

@warrenjacob5264 Жыл бұрын

What is the purpose of the plastic cap? Is there any problem using my valve without a cap? My cap basically fell apart when I took the valve out.

@inovahightechltd Жыл бұрын

Just a protection so dirt doesn’t go into the brass guide

@VegasMikeP229 26 күн бұрын

Really great video!! Need some help - low idle, around 500 rpm and have been trying to get it up to 700 in gear, with AC on. 1. My ebay ICV has a screw in the threaded brass sleeve but it doesn’t see to do anything - should it? 2. It takes 1.3amps to close the valve. It seems that I should have a higher idle with that. 3. The bypass tube from the inlet to outlet rubber caps had an end capped off. Will it idle faster with that replaced with an actual tube, hole all the way through it?? 4. I tried moving the brass insert from flush with aluminum housing but even with a small hammer onto a screw threaded into the insert it didn’t seem to want to move. Is the screw banged on the table the best way?

@inovahightechltd 26 күн бұрын

Low idle in neutral / park with a/c compressor running or in drive?

@VegasMikeP229 26 күн бұрын

@@inovahightechltd 700 in park with AC on, 500 in gear with AC on. The AC won't turn off, I likely have to replace the dashboard switch assembly but I'm in Las Vegas and it's supposed to be 107F today. Not messing with a functioning AC!! I just opened up the bypass tube and haven't started it yet.

@inovahightechltd 26 күн бұрын

@@VegasMikeP229 it’s probably 550 in gear which is normal. The AC Kompressor Relay send one 12V signal to the idle speed control unit which increases rpm by about 50 to 100rpm The A/C compressor relay is controlled by the climate control unit. Pull the compressor relay and see what happens first. It appears that your idle speed valve and idle speed controller are fine

@VegasMikeP229 26 күн бұрын

@@inovahightechltd Ok, it changed but I'm leaving it alone for a while. Hot, it idles at 900 in neutral but around 700 in gear w/AC. The ICV will go almost closed at about 950ma, hang, then close at 1.3A. I'm hoping that just running it for a while will fix the little "catch". I put in an open bypass tube and I'm guessing that's probably why the idle went up. Any idea what the hole size should be? The car ('87 560SEC) had a terrible idle and huge hesitation on minor acceleration. Three different shops have replaced pretty much all the rubber "stuff" on top of the engine, rebuilt but validated Fuel Distributor, new injectors & buckets & o-rings. Even with all that, the idle was close to smooth (most of the time) and acceleration was mostly smooth. Hold the idle at 700 and acceleration was *always* smooth. Yep, multiple problems in a row.

@inovahightechltd 26 күн бұрын

@@VegasMikeP229 this is a bit high of an idle. I made like 3 or 4 videos about those idle speed valves: Mercedes W126 4.2&5.6L - actual test of modified idle speed air valve from tutorial video kzfaq.info/get/bejne/Zq59i89128_TqKs.html Mercedes W126 3.8 5 4.2 5.6L in-depth tutorial of root cause of idle increase with temperature rise kzfaq.info/get/bejne/m6iIe82msNDFYHU.html Mercedes W126 All 8cyl - idle speed issues - often overlooked: Connector, Idler Arm 117-094-03-12 kzfaq.info/get/bejne/qbCdoth2nsXFmHU.html Mercedes - A closer look at the infamous idle speed control / air valve ISCV and it’s internal parts kzfaq.info/get/bejne/j8ibnJZzltzJlqc.html These videos will further explain the issues and how to adjust those valves. Just in case you haven’t seen those already.