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| 2.8 quit; cranks won’tstart (Page 1/1) |
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stevep914
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DEC 15, 06:36 PM
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Had my 86 2.8 run like 1 cylinder was not firing while driving. Parked it and could not find anything obvious. Started it cold, and it idled for 3 minutes normally, and then quit. It would not fire again when cranked. Last time something like this happened, it was the ignition module. Changed it and the problem was solved. I did this again this time, and it solved nothing. I can smell fuel when cranking the engine. I guess I am looking for any advice about where to start, before digging into this step by step. Anything anyone could suggest would be appreciated! Steve
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shemdogg
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DEC 15, 08:58 PM
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All the spark plugs have good spark? How old is the cap/rotor/wires? Smelling fuel then the plugs may be fouled and not sparking enough. Check all grounds for sure, I always wiggle the wiring harness to see if that makes any difference looking for bad connections. Cold start injector leaking? Post up what u find
shem
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sanderson231
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DEC 15, 09:22 PM
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1) Test for spark with a high energy ignition (HEI) spark tester (look like a spark plug with an alligator clip to grounf it)
2) Test the fuel rail pressure with a special fuel pressure gauge (connects to the schraeder valve on the fuel rail). Run a 12V+ jumper to terminal G on the ALDL to hot wire the fuel pump.
3) Test for injector pulses with a "noid" light. Disconnect 1 injector and install the noid light on the connector. Crank the engine and make sure the light blinks.
All the tools are available at major auto parts stores. I think O'Reilly's has them all in their loaner program if you don't want to buy.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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Notorio
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DEC 17, 05:55 PM
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| quote | Originally posted by sanderson231:
.....
3) Test for injector pulses with a "noid" light. Disconnect 1 injector and install the noid light on the connector. Crank the engine and make sure the light blinks.
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You can fit your hand in there? How are you removing and reinstalling the injector plugs?? 
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stevep914
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DEC 23, 01:31 PM
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Just a follow up to finish this thread: I bought a new ignition module and tried changing that first- no luck. Then tested all spark plug wires, tested the coil, cleaned all metal contacts for the coil base and where it fits on the engine, checked and cleaned cap and rotor- all with no spark. Then I found an ignition module under the seat of the car that I presume I bought to carry as a spare when the last one gave out. It did not look new but was in a new box from Autozone. Put it in and the car fires and runs. I guess the new replacement was faulty- will have to go back and see if they can test it, and replace if no good. I hear this happens more frequently than assumed. Thanks for the suggestions, this forum and the internet is a great source of info! I am learning how to be a do it yourselver as honest mechanics here are tough to find. Steve
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sanderson231
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DEC 24, 11:01 AM
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| quote | Originally posted by Notorio:
You can fit your hand in there? How are you removing and reinstalling the injector plugs?? |
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Yes you have to unplug one injector to plug the noid light into the connector. Never did it on a 2.8L but easy to do on a 4.9L or 3800.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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Australian
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DEC 27, 06:06 AM
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Yay thread like these do help others as there was a time for me that this would have helped knowing.
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