A friend has a 1992 vette "J" car. Car has set for 2 years, in garage.
Cranks but won't run. Noid light lights on all injectors. Spray gas in inlet and it will try to run till gas is gone. Fuel pressure is 42 PSI. I pulled a plug wire and there is a yellow spark while cranking.

Scan computer, no codes. Checked CCM, code H64. That code isn't in the GM shop manual.???

I disconnected the TPS and tried to start, of course it didn't. ECM still sets no codes. Unhooked the MAP sensor, tried to start, ECM set no codes.

When it sets overnight, the first time you try to start it it will run for about 2 seconds then die. Then just cranks.

Could this be a bad ECM, scanner sees all sensors, very cheap scanner, BTW. And they look nominal.

Thanks for any help.

 

"J" is the designation for the Corvette ZR-1. So, you're on the wrong site. The ZR-1 had the LT5 engine, which is totally unrelated to the LT1, LT4 or any other engine used in an F-Body (Camaro/Firebird). The ECM may have some remote commonality, so the best bet would be to post this on the "Computer Diagnostics...." forum.

I'll move it there for you. Might get lucky.

 

Sorry, I misspoke. the car has a LT1 and is a "P" car I think.

 

From you explanation, you have a clogged fuel filter or clogged injectors from sitting. I get this from the fact that you can run the engine if you put fuel in the manifold.

Check when you have 42 PSI. Is it while cranking or is it some other time?

 

Fuel pressure is 42PSI while cranking.

Can the injectors be cleaned or are they toast?

 

If they clogged due to lack of use, they will need to be professionally cleaned. I've had mine cleaned and flow checked by TPIS, but the cost is not a whole lot less than new injectors. Someone posted a link to a less expensive source a month or two ago. "Search" might turn up the post.

Pull the rails up and see if the injectors flow when you try and start the engine. Make sure there is no source of ignition nearby, since the fuel will spray.

 

Well you hit the nail on the head. My friend gave the injectors a quick cleaning with carb & choke cleaner and it runs, not good, but at least we got somewhere to go with it.

Thanks for the time to help.