So i had an L shaped idle motor (wrong one for my car) it had a jumpy idle from the day i got it and if in park or neutral my car would I would 2000 rpm I bought a new motor and put it on in now when I start my car off it immediately goes puuuut and dies the only way i can seem to get it to idle is to adjust the screw on the monifold (a no no i am aware of ) otherwise it just kills over i am going to put the old one on because it ag least ran but do you have any ideas? And where is my tps
Well that's what I was thinking but i didnt realize it was on the bottom i found it right after i posted. That said do you have any ideas? I was thinking my tps might be bad the tps tells my idle motor how far to open right?
Is that out of a bently manual? And why would my new idle motor not open? And if erratic idle is a syptom i may have a problem. When i stop the rpms wil jump from 750 to 1000 for a few and if i am at a long light it will eventually drop to 500 to 750 and so on until it is barely staying running it has only died from this once
At 500 rpm it should idle smoothly even if that is a little low. Yes, those are pages from the E30 Bentley Manual. You REALLY need to get one. Erratic idle is almost always vacuum- leak related.
While we're at the TPS
Is there a TPS that will fit in the place of this E30 B20 unit that measures actual throttle position ? Like all civilised vehicles :tsk:
Oh yes, to get back to your problem. If the TPS does not see a closed throttle it cannot tell the idle motor to adjust the idle
Correct. Continuity means zero resistance. 0 ohms. It's really two switches in one housing. It tells the ECU it's either a closed throttle with one switch, or a wide open throttle with the other. In between (throttle part-way open) it should have infinite resistance between the center contact and either of the outside ones. When the throttle is closed, the idle side turns on the idle control valve (through the ECU). If the TPS is bad or adjusted incorrectly, the ICV can't regulate the idle.
That is completely backwards from what it's supposed to be. You should have continuity (zero ohms resistance) between pins 2 and 18 with the throttle closed, and continuity between 3 and 18 with it wide open, and that's all.
Hh, it is an automatic. I suppose that would explain it. So, does that mean I should idle faster in park ? Or should the idle still be in the 500 - 600 range while in park ?
Oooops. Looks like I need a new one. Unless there's a way to know where the set screw is supposed to be. I've been fiddling with it since I got the car a few months ago. My idle was around 1300 rpms and I had to slow it somehow...
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