90 Vette won't start

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Spring Grove, PA - USA

Joined: 7/25/2011

Posts: 18

Vette(s): 1992 Black Rose Coupe

Got fuel pressure 42 lbs. at rail, got spark to multiple plugs and air still wont start, could it be the ignition module or coil even though there is spark, my 92 had spark but was told not enough, turn out i had to change good ole Optispark do 90 vettes reqiure the same amount of spark to fire up

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Vette2100

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Re: 90 Vette won't start

Posted: 10/4/11 10:19amMessage 2 of 25

Adams' Apple

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Duncanville, TX - USA

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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Gotta have spark, fuel, and air, at the right TIME.
You do need a good spark to fire off an engine. Have you checked your plugs for correct gap, fouling, or other problems?

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Re: 90 Vette won't start

Posted: 10/4/11 1:12pmMessage 3 of 25

SAYWHEN

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Joined: 2/26/2011

Posts: 82

vette2100 said: Got fuel pressure 42 lbs. at rail, got spark to multiple plugs and air still wont start, could it be the ignition module or coil even though there is spark, my 92 had spark but was told not enough, turn out i had to change good ole Optispark do 90 vettes reqiure the same amount of spark to fire up

How 'bout some more details. Did it cut off going down the road? OR One morning wouldn't start after being driven the previuos day ? Has any work been done on it recently and now it won't start? What do the plugs look like ? Wet or dry?

Since you have spark I'd try some starting fluid in the throttle body. If it runs w/starting fluid i'd use a noid light to check for pulse at the injectors while cranking since you have fuel pressure.

If it won't start w/starting fluid i'd guess spark is to weak to start (coil maybe??) I say this under the assumption that nothing has been done to change spark timing such as loosening or removing the distributor recently.

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Re: 90 Vette won't start

Posted: 10/4/11 1:14pmMessage 4 of 25

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Spring Grove, PA - USA

Joined: 7/25/2011

Posts: 18

Vette(s): 1992 Black Rose Coupe

Yeah plugs are good the car started ran for ten seconds then shut off, thats what my problem was with 92, had spark but not enough thats what i am wondering could it be the ignition module or if thay was no good would i get no spark at all

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Vette2100

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Re: 90 Vette won't start

Posted: 10/4/11 1:25pmMessage 5 of 25

SAYWHEN

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Joined: 2/26/2011

Posts: 82

When the ign. modules fail you would loose spark. Once again starting fluid would check the entire ignition system....so to speak

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Re: 90 Vette won't start

Posted: 10/4/11 2:39pmMessage 6 of 25

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Spring Grove, PA - USA

Joined: 7/25/2011

Posts: 18

Vette(s): 1992 Black Rose Coupe

tried starting fluid fires n thats it so i guess its getting spark, i have heard that if even one injector is bad the car wont start

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Vette2100

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Re: 90 Vette won't start

Posted: 10/4/11 2:40pmMessage 7 of 25

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Spring Grove, PA - USA

Joined: 7/25/2011

Posts: 18

Vette(s): 1992 Black Rose Coupe

nothing was done car arn fine then went to start it one day and it ran for ten seconds and shut off, wont start now

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Vette2100

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Re: 90 Vette won't start

Posted: 10/4/11 4:01pmMessage 8 of 25

eddie20875

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Lanoka Harbor, NJ - USA

Joined: 12/21/2006

Posts: 2191

Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c

could it be the fuel pump relay?

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Re: 90 Vette won't start

Posted: 10/4/11 4:06pmMessage 9 of 25

SAYWHEN

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Joined: 2/26/2011

Posts: 82

vette2100 said: tried starting fluid fires n thats it so i guess its getting spark, i have heard that if even one injector is bad the car wont start

Yours pulses 4 injectors at one time (what some call batch fired)...the ECM has 2 injector drivers each driver running 4 injectors..so if one injector is bad the "driver" won't operate any of the 4 on that circuit. If you have a VOM check the resistance on each injector I think they should read around 16 ohms..that may vary a little depending on your meter. The point is the readings of all should be close to the same. if you have one reading 3-4 ohms or one reading 48 ohms those injectors are bad and all should be replaced. If the readings are good you're back again IMO to checking for pulse at the injector connectors w/a noid light

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Re: 90 Vette won't start

Posted: 10/4/11 5:45pmMessage 10 of 25

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