Help
Thread Starter
4th Gear
Joined: Jun 2015
Posts: 4
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Help
Hey everyone my name's Jordan,first post. I have an 85 in the shop with a no start issue. Determined initially it was a bad pick up coil. Replaced dizzy car starts up and runs perfect for minute and a half then dies again. Now i have spark but no injector pulse whereas i had vice versa before. Figured might be cheap junk A1 reman unit so we replaced again. same thing again. Got spark with no injector pulse. Fuses and everything else are all good. Tps, maf everything else is all good. Could this just be as simple as a bad module? At my wits end. Help
Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
Remove the injector connector. Measure the resistance between the two injector pins. Use the lowest DVM scale (probably 200 ohms). The resistance should be above 12 ohms. Usually they will measure about 15 ohms and all of them should be pretty close to the same resistance.
Thread Starter
4th Gear
Joined: Jun 2015
Posts: 4
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Actually gm-sourced bosch multec injectors will all read right around 16.1 ohms, In which case these all do... i know that in this case all these A1 remanned dizzys are crap in my experience . I've been through three in as many days but i have to think that there's no way that at least one of them wasnt good which was there only one in which the car started. It ran for about minute and a half and gave up the ghost. Everything keeps pointing me back to dizzy. Got fuel, got spark, but no injector pulse. Tps is set at .54v closed and communication with everything else is fine, i.e. wiring, ecm, proms, etc. I have a snap on solus pro scanner which wasnt a problem scanning just no codes.
Thread Starter
4th Gear
Joined: Jun 2015
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Think about it like this, if i pull an injector wire pigtail and install a noid light, hook up the distributor in all respects, coil, batt. hot
, etc. If i keep it out of the car whilst key-on-hot (key turned to hot) and spin the main shaft on the dizzy, i should see that noid light pulsing... but i don't.., even tried a known good ecm with good eproms, still same symptoms... is it really possible that I get a STRING of bad dizzzys?
, etc. If i keep it out of the car whilst key-on-hot (key turned to hot) and spin the main shaft on the dizzy, i should see that noid light pulsing... but i don't.., even tried a known good ecm with good eproms, still same symptoms... is it really possible that I get a STRING of bad dizzzys?
Melting Slicks
Joined: Aug 1999
Posts: 2,240
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From: Baltimore, MD USA
Did you verify on your scanner there is engine rpm?
That signal comes from the Purple/White wire of the 4 pin distributor connector to ECM connector C2 pin B5.
Another indication there are distributor reference pulses is the ECM will continually enable the fuel pump relay as long as it sees the pulses.
That signal comes from the Purple/White wire of the 4 pin distributor connector to ECM connector C2 pin B5.
Another indication there are distributor reference pulses is the ECM will continually enable the fuel pump relay as long as it sees the pulses.
Race Director
Joined: Feb 2003
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From: Kingman AZ
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