I'm looking for some bright ideas to try and solve a problem that's driving me nuts
The car in question is a 1997 155 2.0 16v. About 8 months ago it decided it wouldn't start. With one thing and another I have only got around to fixing it over the last 2 weeks. So after much reading on this forum and tracing almost every bloody wire in the car (I'm now an expert on 155 wiring!!!
) I found the problem. It turned out to be the result of a particularly nasty after market alarm installation. Where the genius responsible had cut into the live feed to the fuel pump to install the alarms fuel cut off/immobiliser, the contact over the years had cooked itself and decided to give up! So now the car starts on the key as it should... Happy days.
However this is now the problem thats wrecking my head...
When the car starts the revs shoot up to 2200rpm and hold steady there for about 30 seconds. Then it starts blipping between 2200rpm and 3200rpm constantly. Even if I restart the engine it goes straight back into that pattern.
Today I took the Idle Control Valve thingy and the Air Flow Meter off and gave them a good clean with Carb cleaner but still no luck. Two other observations are when I unplug the Air Temperature sensor while the engine is running the revs shoot up and hold steady around 4000rpm dropping back down into the blipping patten when plugged back in and when I unplug the AFM the engine nearly dies but then recovers and holds at about 1000rpm with no blipping but very roughly.
Anyone any bright ideas as to the cause? I really suspect the AFM but at this stage the obvious could kick me in the face and I'd probably miss it!
Thanks for your suggestions