Date: Sun, 06 Apr 2003 21:35:29 +0100 From: Johannes H Andersen <johsnopsamfitter.com> Subject: Re: Strange idling behaviour, hopping between 1500 and 2000 rpm
Nel Frikandel wrote: > > Hi, > > Yesterday noticed some strange behaviour, on my 1995 9000CS (2.0i). > > The "Check Engine" light had been on for a day or so, which is a > common syndrom of my car, probably due to a funny LPG conversion, and > often happening after a sudden change of weather type. > > I stopped for a traffic light, the engine kept running at 4000Rpm, > Then after I tapped the accelerator pedal, it fell back to 1500, from > which it hopped up and down between 1500 and 2000. I shut the engine, > switched back to petrol, and started again, but the "hopping between > 1500 and 2000 stayed. After a break of 10 minutes, it ran normal > again. > > Any ideas on this kinda behaviour? Listen for whistling sounds in the engine. Had this once, it was due to a split end of a small rubber air hose from the manifold. The pipe presumably carries a pressure signal to a sensor, the split was hidden from view. Cure: cut 1" of bad end to remove split and refit. Johannes