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Topic: 90 Vette won't start

in Forum: C4 General Discussion


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Re: 90 Vette won't start (15/25)
 10/6/11 9:57am
vette2100
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Spring Grove, PA - USA

Vette(s):
1992 Black Rose Coupe


Joined: 7/25/2011
Posts: 18

42 lbs while cranking checked it three times gonna check thr TPS today , the pressure is at fuel rail

|UPDATED|10/6/2011 6:57:58 AM (AZT)|/UPDATED|


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Vette2100
Re: 90 Vette won't start (16/25)
 10/6/11 1:25pm
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

Something stinks in Denmark.....got good fuel pressure, infectors firing, plugs sparkin....I assume the plugs are all sparkin? I think I'd have to get a spark tester and see how much energy the coil/ign is actually getting to the plugs, at this point....sure seems like it's gonna be an ignition issue somehow.

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Re: 90 Vette won't start (17/25)
 10/6/11 5:17pm
vette2100
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Spring Grove, PA - USA

Vette(s):
1992 Black Rose Coupe


Joined: 7/25/2011
Posts: 18

That was my next step after that I have no idea i am gonna test coil and if its good guess it will have to go to shop. Thanks

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Vette2100
Re: 90 Vette won't start (18/25)
 10/6/11 10:37pm
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

Imma gonna back up a bit, and ask...have you actually checked each individual infector for resistance? You could have ONE infector that is shorted, or close to it, and it would kill all of the infectors on that side of the engine, making it hard to start, or not start at all. Unplugging them to use the noid light would show them to be getting a signal to fire, but once plugged back in, it would again kill the circuit.
I mention this because my '85 had ONE bad infector(shorted), and it absolutely would not start. I'm sure if the rest of them weren't derty from age, it may have had an easier go at it, but still....


|UPDATED|10/6/2011 7:37:52 PM (AZT)|/UPDATED|


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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: 90 Vette won't start (19/25)
 10/7/11 9:31am
vette2100
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Spring Grove, PA - USA

Vette(s):
1992 Black Rose Coupe


Joined: 7/25/2011
Posts: 18

yup, checked each injector, all are good, ihave no idea what to do next. This is what if done so far, injectors, fuel pump , fuel filter, ignition module and coil. The only thing that i can think of now is, is the ecm bad? i guess a Gm shop would have a way to test it, so maybe that will be next step

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Vette2100
Re: 90 Vette won't start (20/25)
 10/7/11 1:03pm
SAYWHEN
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Joined: 2/26/2011
Posts: 82

vette2100 said: yup, checked each injector, all are good, ihave no idea what to do next. This is what if done so far, injectors, fuel pump , fuel filter, ignition module and coil. The only thing that i can think of now is, is the ecm bad? i guess a Gm shop would have a way to test it, so maybe that will be next step


What resistance readings did you get on each injector ? Was it 15-16 ohms ? When you checked while cranking engine with a noid light plugged into the injector harness...the light flasnes while cranking...correct ?
Re: 90 Vette won't start (21/25)
 10/7/11 8:25pm
vette2100
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Spring Grove, PA - USA

Vette(s):
1992 Black Rose Coupe


Joined: 7/25/2011
Posts: 18

finally got it running thanks everyone i put another coil in it this morning and it fired up

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Vette2100
Re: 90 Vette won't start (22/25)
 10/7/11 10:41pm
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

Glad ya got it runnin again! Sux when new stuff don't work, but it happens all the time....

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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: 90 Vette won't start (23/25)
 10/7/11 10:53pm
eddie20890
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lanoka harbor, NJ - USA

Vette(s):
1990 L-98 white/ red/black leather interior targa top auto 1975 L48 blue/black leather interior t tops auto


Joined: 3/22/2009
Posts: 1363

just another question....is there any codes stored in the memory. i saw no mention of you checking for any.

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Re: 90 Vette won't start (24/25)
 10/8/11 7:06am
SAYWHEN
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Joined: 2/26/2011
Posts: 82

Glad to hear you got her goin' !Big smile
Re: 90 Vette (25/25)
 6/19/14 1:01pm
ORD
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Joined: 3/12/2014
Posts: 3

Check the pressure regulated , you could pull injector out to check spray . Pinch off return line and see if regulator hold pressure .
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