Chimaera cutting out at junctions..

[ward6636]

Hi. The alternator packed up on my chimaera a few weeks ago I had it repaired and on the way home the car would cut out rolling up to junctions after dipping the clutch. After much googling I cleaned the stepper motor which seemed to help for a little while then it cut out again. I changed the stepper for an ebay special and it's made the car worse in my opinion. If I start the car and let it idle for 5 minutes then disconnect the stepper it runs fine. Is this just a case of a cheap stepper not being up to the job? Could it be the pipe from the stepper housing to the fuel regulator?

[taylormj4]

Not an expert but I believe there are several reasons this can happen; it's a fairly common complaint. Not sure how it would relate to a replaced alternator directly but they could have upset something else of course whilst doing the work.

Have had this on mine on and off. It seems to come and go. I just got used to being able to brake and blip the throttle with the outside of my right foot when needed.

The stepper motor can be at fault but there are several other reasons. Can you still hear the stepper motor pulsing when you turn the Ignition off?

Base idle is one to check. This should be set with the air hose to the stepper pinched closed or closed off.

Do you have Rovergauge? You can see the ECU trying to control the idle speed via that. Think you can also send signals to the stepper motor to check it is responding correctly too.

The speed sensor also affects idle speed but I think it only increases the idle speed not reduces it.