[W126 Coupe] Strange Idle problem

[Henric]

Idle should be bit higher. Replacing an otherwise perfectly functioning ICV in my 500 euro solved my stalling issue. All 500/560 ICV look alike but do vary. 

-h


On Nov 11, 2010, at 3:42 PM, David Doubtfire <david at racetek.com.au> wrote:


> This is the first time I have used this mailing list so I hope someone can help me.

> 

> I recently had a high idle, hard start problem with my car (Euro 500SEC 1983) which I had recently purchased. I was offered a second hand ICV from a 560SEC (US), which I was told would probably work. I put it in, and hey presto, the car started first time from cold, and after a quick test drive the idle settled down to a steady 500rpm, and would start easily when hot. A few day later I took a short trip and the car suddenly stalled when I stopped at a set of lights, and later stalled at speed when I took my foot off the throttle.

> 

> Back at the garage I checked everything and nothing seemed amiss. when hot, the engine would start easily and idle at 500rpm. The revs would then start to rise and fall, with the revs going higher and lower until it would eventually stall.

> 

> I took out the Fuel Pump Relay (FPR) and bridged the pins to keep the pump running and try to eliminate it as a cause, but the symptoms remain.

> 

> Firstly, does anyone know if the 560 ICV will work OK in a 500 (euro), and has anyone had a problem like this. Once running the engine runs sweetly.

> 

> Many thanks

> 

> David

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.