Thought it was my stepper motor but...
Discussion
....now not so sure.
I've had tickover problems with my Chim since I got it a few months ago. It started off by just stalling if left ticking over for more than about 20 seconds and mild shunting. Then it got worse. Revs all over the place, toe and heeling coming up to lights etc but even then the revs would vary wildly with no change in throttle input. Basically, undriveable. I checked the stepper and it was perfectly clean. I did notice it wasn't done up tightly at all, it could easily be turned by hand. I would say it was actually slack. Put it back in with some PTFE and nipped it up and it was a different car. The car was transformed and a pleasure to drive. How I always imagined it would be.
Today, we are back to square one. In fact the problem is even worse as there is very bad misfiring higher up the rev range.
If it is a stepper motor bad connection or something then surely it wouldn't affect higher up in the rev range. And where would the non-stepper end of the stepper loom be in order to check the contacts? On the ECU?
Anything else I could easily check? I could do with sorting it myself rather than taking it to someone who know what they are doing as money is tight.
Ideas would be great.
Pete
I've had tickover problems with my Chim since I got it a few months ago. It started off by just stalling if left ticking over for more than about 20 seconds and mild shunting. Then it got worse. Revs all over the place, toe and heeling coming up to lights etc but even then the revs would vary wildly with no change in throttle input. Basically, undriveable. I checked the stepper and it was perfectly clean. I did notice it wasn't done up tightly at all, it could easily be turned by hand. I would say it was actually slack. Put it back in with some PTFE and nipped it up and it was a different car. The car was transformed and a pleasure to drive. How I always imagined it would be.
Today, we are back to square one. In fact the problem is even worse as there is very bad misfiring higher up the rev range.
If it is a stepper motor bad connection or something then surely it wouldn't affect higher up in the rev range. And where would the non-stepper end of the stepper loom be in order to check the contacts? On the ECU?
Anything else I could easily check? I could do with sorting it myself rather than taking it to someone who know what they are doing as money is tight.
Ideas would be great.
Pete
Yes it was every time I accelerated but it was only when under part throttle. If I accelerated harder then it would get up and go perfectly. I took a plug out before. Looks like we're running very rich. That was after a reasonable run, engine well up to temperature.
I've checked the air flow meter with a voltmeter and the values are fine for ignition on and idle.
It did have a new temperature sensor before I bought the car but I'm suspecting that will be worth changing, just in case...
Wow, that's a hefty fuse to burn through. What was the cause of that then?
I've checked the air flow meter with a voltmeter and the values are fine for ignition on and idle.
It did have a new temperature sensor before I bought the car but I'm suspecting that will be worth changing, just in case...
Wow, that's a hefty fuse to burn through. What was the cause of that then?
Cheers for all of the suggestions. Much appreciated.
I've not had any time this weekend to tinker further but I went for a 15 minute drive this afternoon and it seemed to run perfectly. Makes me think it's a connector / bad contact / broken wire. Or a duff sensor. All I've done since it was barely driveable is test the voltage on the MAF, take a spark plug out and take the coolant temp sensor plug off and put it back on. Hopefully it's just a bad contact that I've disturbed. I will investigate further when I get a minute!
I've not had any time this weekend to tinker further but I went for a 15 minute drive this afternoon and it seemed to run perfectly. Makes me think it's a connector / bad contact / broken wire. Or a duff sensor. All I've done since it was barely driveable is test the voltage on the MAF, take a spark plug out and take the coolant temp sensor plug off and put it back on. Hopefully it's just a bad contact that I've disturbed. I will investigate further when I get a minute!
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