I had long suspected the idle stepper motor is not working properly. Sometimes it felt that the car runs like there was an air leak. Removed the idle motor out for inspection. In Rallye, the idle motor is quite difficult to access, easiest is to operate through a hole in fender... Cleaned the shaft of the motor but it didn't help. New motor needed.
The same idle motor is used in following vehicles (PSA-#1920V7/#19206Q , symmetrical fastening):
306 1,8-16V 97 [1997-2002]
Xantia 1,8-16V [1993-2001]
ZX 1,8i-16V [1991-1997]
406 1,8-16V [1996-2000]
Cheap aftermarket units exist but I bought a Marelli unit. Assembled and car runs finer than in a long time.
Speaking of engine control equipment, lambda sensor and crankshaft position sensor are fairly new too, changed them couple of years ago. I have had bad experience with cheap aftermarket lambda sensors in my ex 205 so nowadays when it comes to engine sensors, I prefer the original items even though they are more expensive.
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