ecu problem or wiring problem?
#1
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ecu problem or wiring problem?
i have a 94 boosted gsr. the car will run great for about 30-45 minutes of drive time then it just starts missing on cylinder 4, got spark but no fuel. so i got my volt meter out and check the power going to the injector harness, i have a constant 12.5 volts coming out of both sides of the pigtail. if im correct one should be a "signal/ground" for pulse or what not? so i checked the other pigtails and they are all reading 12.5 and .0009 or some some number in that nature. i figured if it was a short in the harness it wouldnt have any power to the pigtail, correct? so i put the factory ecu back in and volts show to be fine on both side of the pigtail, then i put the neptune ecu back in and it runs fine again for another 30-45 minutes or so. someone please shed some light on this please. anything will be greatly appreciated...
its bone stock on 10lbs with a precision 5731 billet wheel, rc 750cc's and a walbro 255.
its bone stock on 10lbs with a precision 5731 billet wheel, rc 750cc's and a walbro 255.
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Re: ecu problem or wiring problem?
so would a new dizzy resolve the issue? like i said tho ive got spark. the dizzy thats on there is only 6 months old. and its just the one (#4) cylinder..
#4
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Re: ecu problem or wiring problem?
I know you said you have spark but you didnt say how you confirmed that. So I didnt trust it. A simple dist swap would eliminate alot of variables. If you still think its injector related you can swap injector to another cylinder and see if the problem follows the injector.
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Re: ecu problem or wiring problem?
problem does not follow injector. that was my first test. i tested spark by pulling a plug wire and putting a plug that i was not using in the wire and held it against clean metal and had a blue spark.
#7
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Re: ecu problem or wiring problem?
If you swapped all the plugs, the injector driver circuit could be done for #4. Have you visually inspected the ECU for any signs of burnt pieces or the likes. Do you know anyone that has equipment to test the ECU? I have been seeing a fair amount of Demons dieing lately as well...
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Re: ecu problem or wiring problem?
If you swapped all the plugs, the injector driver circuit could be done for #4. Have you visually inspected the ECU for any signs of burnt pieces or the likes. Do you know anyone that has equipment to test the ECU? I have been seeing a fair amount of Demons dieing lately as well...
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