How to test a Mercedes-Benz idle control valve?
Plug on couple at idle speed adjuster in a manner that voltage can be measured on plug. Engine at idle. If a faulty control unit is found, nowhere within the Mercedes Manual does it suggest this method but others have suggested this and it worked for me. Remove the control unit cover and lightly twisting from side to side while engine is running.
Why does my Mercedes W126 500 SEC idle problem?
If you have the motorised fast idle device and not the bimetal strip type then its driven off the OVP relay – so that’s the one you need to check /resolder for dry joints. There’s also a throttle closed microswitch it might be worth checking. Lots of Mercedes! Does your car have ASR? This causes issues…
Is the idle speed adjustable on the Mercedes 116 / 117?
The 116/117 does not have an adjustable idle control. Each component within the system that make up the idle control must be functioning properly. Unless your vehicle was retrofitted with the old idle adjustment valve and ICV removed (pre-84), idle speed cannot be adjusted, only affected by failed componenets.
Is it normal for the idle to rise to 550 rpm?
Yes 550 rpm is normal. The idle should not rise when AC is switched on. The idle control unit supplies a signal, delayed, to compensate for the additional resistance caused by the compressor. The 116/117 does not have an adjustable idle control. Each component within the system that make up the idle control must be functioning properly.
Plug on couple at idle speed adjuster in a manner that voltage can be measured on plug. Engine at idle. If a faulty control unit is found, nowhere within the Mercedes Manual does it suggest this method but others have suggested this and it worked for me. Remove the control unit cover and lightly twisting from side to side while engine is running.
The 116/117 does not have an adjustable idle control. Each component within the system that make up the idle control must be functioning properly. Unless your vehicle was retrofitted with the old idle adjustment valve and ICV removed (pre-84), idle speed cannot be adjusted, only affected by failed componenets.
If you have the motorised fast idle device and not the bimetal strip type then its driven off the OVP relay – so that’s the one you need to check /resolder for dry joints. There’s also a throttle closed microswitch it might be worth checking. Lots of Mercedes! Does your car have ASR? This causes issues…
Yes 550 rpm is normal. The idle should not rise when AC is switched on. The idle control unit supplies a signal, delayed, to compensate for the additional resistance caused by the compressor. The 116/117 does not have an adjustable idle control. Each component within the system that make up the idle control must be functioning properly.
Can a car idle speed be adjusted without an ICV?
Unless your vehicle was retrofitted with the old idle adjustment valve and ICV removed (pre-84), idle speed cannot be adjusted, only affected by failed componenets. Here are the tests quoted from the MB sevice manual.
Where can I buy an idle air control valve?
An aftermarket IAC valve from AutoZone can properly distribute the amount of air flowing into your engine, ensuring a well-operating and efficient ride. Shop for an idle air control valve at your local AutoZone store or online, and benefit from our customized selection.
Can a bad idle control valve cause stalling?
This is controlled by the engine’s computer. Sometimes parts go bad, which results in your car idling strangely or stalling. Check to see if your idle control valve is functioning properly before attempting to replace it. Look for a high engine idle. A common symptom of a faulty idle control valve can be a high idle.
Unless your vehicle was retrofitted with the old idle adjustment valve and ICV removed (pre-84), idle speed cannot be adjusted, only affected by failed componenets. Here are the tests quoted from the MB sevice manual.