ignition problem - Team Camaro Tech
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post #1 of 11 (permalink) Old Feb 3rd, 07, 12:37 PM Thread Starter
wayne moore
 
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ignition problem

My son has a 91 Z-28 with a 5.7 tuned port injection engine, for the last week it has failed to start, the engine turns over good, has plenty of fuel in the fuel rails but no spark on the coil or distributer. There has been a couple of times that it started and ran good for a few miles then starts cutting out and dies. We changed the coil, ignition module, and the rotor, it cranked and ran and then did the same thing. There is power to the coil and distributer but still no spark Any help is appreciated.
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post #2 of 11 (permalink) Old Feb 3rd, 07, 12:54 PM
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Re: ignition problem

First thing that comes to mind is the oil pressure switch. Not the sender for the gauge. Those cars have a pressure switch that ties into the computer, and it will kill the motor if it thinks there is no oil pressure.





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post #3 of 11 (permalink) Old Feb 3rd, 07, 12:58 PM
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mike
 
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Re: ignition problem

sounds like a similar prob in another post...sounds like a hall effect sensor...its a magnetic pick-up in the distributor that tells the computer when the engine`s turning over...do you have a noid lite set???you can unplug an injector and check for injector pulse to see if you`re getting a distributor reference to the computer...you could do this by scan tool also, but not everyone has one of them...or you could`ve gotten another bad module...
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post #4 of 11 (permalink) Old Feb 3rd, 07, 01:00 PM
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Re: ignition problem

jim, doesnt that sensor kill the fuel pump???
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post #5 of 11 (permalink) Old Feb 3rd, 07, 02:14 PM
Rich
 
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Re: ignition problem

i was going to say the same thing. it sounds like the distributer to me as well. i had a similar issue and i tried everything and $800 it ended up being the distributer.
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post #6 of 11 (permalink) Old Feb 3rd, 07, 02:17 PM Thread Starter
wayne moore
 
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Re: ignition problem

first thing, thanks for the replies. I had borrowed a scanner from a friend, the only code it picked up was a bad egr valve, but that should'nt stop it from getting fire, I'm limited on knowledge and special tools. Does anyone know if that car has a crank sensor, if it does I can't find it. I've looked in the GM books I have but can't find anything.
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post #7 of 11 (permalink) Old Feb 3rd, 07, 02:19 PM
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Jim
 
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Re: ignition problem

Quote:
Originally Posted by kustomwerker View Post
jim, doesnt that sensor kill the fuel pump???
yes, yer right, that's what it does.

tpi car would have an hei, maybe the module's bad?





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post #8 of 11 (permalink) Old Feb 3rd, 07, 02:23 PM
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mike
 
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Re: ignition problem

the scanner will show you if theres a crank reference when you turn the car over, but you need a scanner that will show a data stream...easier to plug a noid lite into an injector plug to see that...the grank sensor you are refering to is the hall effect sensor i was refering to, and is the round magnetic thing under the rotor in the dist...
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post #9 of 11 (permalink) Old Feb 3rd, 07, 02:24 PM
Rich
 
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Re: ignition problem

no crank sensor on th L98 block. my $$$ is on the distributer.
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post #10 of 11 (permalink) Old Feb 6th, 07, 03:26 PM Thread Starter
wayne moore
 
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Re: ignition problem

Thanks for the help, It was the hall effect senser. at least I think so. its running now. Great site, you can learn alot just scanning all the post.
thanks alot
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post #11 of 11 (permalink) Old Feb 6th, 07, 04:11 PM
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Re: ignition problem

I just caught this post. its the crank sensor under the distirbutor.

AE2(AW) Harley Moody, USNavy
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November 26th, 2008 was my last day to serve my country as a member of the World's Greatest Navy.
Thanks Chief.
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