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DME/ECU (archive)

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Posted by Bob on June 11, 2000 at 01:15:25:

In Reply to: Re: No power above 5000 rpm/ Need //M3 Guru posted by CFL on June 10, 2000 at 21:22:47:

: :
: :

: Sorry, not very good advice from me but a couple of things. Our engines pull the hardest from 4500 to 7000rpms, so definitely your buddy's car is going to feel very slow.

: I would've suggested trying another DME (ECU as you say) but you've ruled it out. Any chance that it could be cap/rotor/wire related? Another cause for slow S14's is the throttle position sensor (you've replaced it) but is it adjusted properly? It should click just as you come off idle, try it out by manually opening the throttle and listening for the click. I'm out of advice and it might not be the correct advice anyway.

: Try contacting one of the Roundel advisers, Fillipo at probably can advise you best. Give him as much info as possible.

We did ensure that the TPS is adjusted properly in fact.

I proposed the idea to him that other parts (other than the PROM chip) of the DME could be inop, so that certain inputs are ignored, eventhough they are present.

Unfortunately, obtaining a complete spare computer is an expensive trouble shooting measure that he was hoping to avoid by finding something else first.

I have a handheld diagnostic oscilloscope that I was thinking of connecting to the injectors to make sure taht the pulse width was indeed affected by the TPS "wide-open" signal, as well as the RPM sensor.

As we know, over about 3500 rpm the AFM no longer signals for wider pulse widths (more fuel) and it is up to the RPM sensor to signal the DME to increase the injector pulse duration the pre-programmed amount depending on the exact RPM. the TPS adds even more fuel, of course, when it senses WOT.


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