BlowMyWhistle 0 Report post Posted December 9, 2011 Hi Y'all. I've posted before regarding this car with it's incessant fault, the idle is all over the place, but not consistently, like a flick of the switch it will be idling normally, then 1500rpm. Cold start, idles fast, then settles to normal 750rpm. Problems seem to start when the engine is hot?? After months, even years of frustration, car being checked out, tuned up, my daughter bought herself a Fraud escape, with Ghetto style 20" wheels... I been driving hers, been off the road for weeks, while I'm changing my waterpump. It's been suggested to me the cold start sensor could be the culprit? I unplug it when the car is hot, it rages up briefly, then settles to a normal idle. I'm guessing there's a signal sent from the sensor to the cpu and the motor, or idle correspondingly adjusts itself?? I'm gunner unplug it and see if it makes a difference?? Funny but it seems to 'come right' after I pull the temp sensor plug, then refit it.. Now my daughter doesn't want it, my son's 18, He'll take hand me downs, but useless if it's not working. I've posted about this car before, think some may recall? If not look up my old posts... Cheers y'all.. Quote Share this post Link to post Share on other sites
hotwire 352 Report post Posted December 9, 2011 It is not a cold start sensor as such but an engine managament temp sender which relays a signal back to the ECU depending on engine temp. Is easy to diagnose - high resistance when cold (about 3kish ohms) down to around 250ish when engine at temperature. A varying reading working downwards as temp rises. Quote Share this post Link to post Share on other sites
BlowMyWhistle 0 Report post Posted December 9, 2011 Cheers for that, this has given no end of trouble for 3 years on and off, I just took the wire off and went for a long drive, peak hour down the freeway, lots of stops and starts, It ran fine, idled nicely. Tomorrow I'm gunner gobi a new one! Problem solved fingers X.d We've had Master Mechanics, cowboys, all sorts diagnose itr, but they all missed this... Wood it not come up on a diagnostic scan??? It is not a cold start sensor as such but an engine managament temp sender which relays a signal back to the ECU depending on engine temp. Is easy to diagnose - high resistance when cold (about 3kish ohms) down to around 250ish when engine at temperature. A varying reading working downwards as temp rises. Quote Share this post Link to post Share on other sites
