[W126 Coupe] cold idle surging

[Josh Allen]

On 2/1/2010 6:32 AM, Graham Scaife wrote:

> My  88 560 sec surges when cold. With a constant throttle setting 

> after start up (cold) the car surges for 1 to 2 seconds then dies down 

> to almost idle,

> then the process repeats itself until the engine warms up. I am sure 

> this may appear somewhat amusing to the casual onlooker, but not for 

> the driver.

> Any help here would be appreciated as the problem seems to be getting 

> worse on very cold days on Long Island. By the way, thank you for the 

> advise on removal of the hazard switch. Everything went well.

>     Graham


Graham,

I don't know the specifics on the 560 injection system, but the next 
time you go to start the car, you might try cleaning the idle control 
valve.
That sounds like a sticky valve that's sticking partially open, and then 
snapping fully open when it overcomes the binding inside.

-Josh
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