'95 lt1 won't start - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 6th, 10, 06:56 PM Thread Starter
Gerald
 
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'95 lt1 won't start

My car has been in storage for a couple of years.I now have time to use it so i decided to check it over.
I did the usual ,change oil ,filter,new coolant.the engine was rebuilt before storage and did run.
It has plenty of fuel in the tank (new ).
It cranks over fine.
I don't see any spark at the coil.
Also i am not sure if the injectors are working..I get less than 1vac at the connector.
There is plenty of fuel pressure.
There is 12.5 vdc at the coil pink wire,both at crank and key on.
Thats all i can think of.
It sure would be nice if there was a troubleshooting tree for these things.
Thanks
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post #2 of 6 (permalink) Old Nov 6th, 10, 10:35 PM
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Re: '95 lt1 won't start

Did you get coolant on the distributor(OPTI) when you changed it out? If so, you may have ruined it. If the opti gets wet, it will not crank up.

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post #3 of 6 (permalink) Old Nov 7th, 10, 12:20 AM
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Re: '95 lt1 won't start

Most fuel injectors are supplied key on 12 volts dc.
The computer grounds them to switch them on, but the pulse is so quick most volt meters can't catch it and display the voltage before the computer is done firing the injectors.
You can buy a cheap noid light set. They plug in inplace of an injector and flash a light instead of trying to get the volt meter to work.
I purchased a set for $15-20 at the parts store.

That said, my first guess would be the optispark.
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post #4 of 6 (permalink) Old Nov 7th, 10, 04:05 AM Thread Starter
Gerald
 
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Re: '95 lt1 won't start

looks like i'll go get a noid light today and check that.
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post #5 of 6 (permalink) Old Nov 7th, 10, 09:24 AM
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Re: '95 lt1 won't start

As said, one wire on injectors, black(?), is battery voltage from an ign controlled relay from a fusible link on the solenoid stud. Colored wire is from ECM.

A good brand of DMM will have an analog scale, series of black squares across the display and the scale reacts very quickly to incoming voltage. You might be able to view the 'low' the ECM places on the colored wire to open the injector.

Another point as suggested, the dist gives out a REF pulse to the ECM and ECM splits it; one for ign/spark, the other for injector pulse, no dist, no workie.

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post #6 of 6 (permalink) Old Nov 7th, 10, 05:17 PM
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Re: '95 lt1 won't start

I would look at the module in the dist, like Everett mentioned. That was what was wrong with my 91 truck.

If you get a noid checker and it does not light when cranking over the motor then it is a bad wire, connection, module in the distributor.

Mike
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Last edited by prostreet69camaro; Nov 8th, 10 at 03:07 AM.
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