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The ECU was dead, lots more (m) (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by GHBH on January 09, 2001 at 11:36:52:

In Reply to: Re: Got the exact same problem! (very long) posted by Bob K. on January 09, 2001 at 02:33:22:

My car had a slowly dying ECU. The car would completely die on occasions, but a little bit of pounding on the ECU would get it running again. Finally, it died completely. I didn't know about the solder fix at the time, so I bought a rebuilt unit from ProGrama for $380.

I have NOT checked the throttle switch. How does it get stuck? Do they ever come out of adjustment? I've had the car since new, and the throttle switch has never been touched. Your suggestion is a great one, though, because its problem does seem to be running too rich off idle. Do you think the throttle switch can cause this problem intermittedly?

I guess that is really the problem, though. It is very intermittent, only happens once every few months, and almost instantly goes away. If I check the connections while the car is running fine, I don't think I'll see a problem.

My car has 117K on it. My problem with a used AFM is that they are still kinda expensive used, and I will not know what I am getting. I'd rather just spend $150 extra for brand new.

Haven't cleaned the injectors, but I don't think they would cause an intermittent, extreme running problem.


I have replaced, in the last year (not necessarily because of this problem): The ECU, all relays, all fuses, all vacuum lines, fuel pressure regulator, fuel filter, plugs, cap, rotor, valve adjust. Checked and cleaned the crank position sensor and the engine speed sensor (both checked out good electrically). Checked the resistance of the temp sensor, cold and hot, and it is fine. Maybe some other things I am forgetting.

Very surprised you changed the ECU. Did you check the throttle switch? If it's stuck in the idle position, I believe it will choke the motor, or at least make it run very rich as you go off idle.

Also, did you clean the injectors? You could also check the various sensor values at the Motronic connector (for broken wires, etc). Lastly, if you decide to replace it, why buy a new AFM? They can be had used fairly cheap.

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