86 Vette not running

[metoo1012]

Pulled the valve cover to verify no 1 at tdc. crank at no. 1 dist. at no. 1.
Have compression on all cylinders. Code 12, spark is blue in bypass mode, noid light blinks
Had control module tested at Auto Zone, had AZ test mod 5 times to prove unit. passed. pick up coil is new and passes testing.Injectors are new. am now going to the egr valve. Theory ? Stuck valve and or not seated, allowing positive pressure in the plenum. Noticed vapors or smoke emiting and slight outword pressure at the intake end .
I refuse to give up I refuse to give up I refuse to give up. This has been them most challenging vehicle I have ever come across. replaced spark control
thanks for the input
Earl

ps 150 lbs compression

 

[metoo1012]

Can not keep the engine running long enough to check anything
thanks

Earl

 

[The Car Whisperer]

Can not keep the engine running long enough to check anything
thanks

Earl

Hang in there Earl, a member of this forum is sure to come to the rescue. They have helped me out many times.

 

[metoo1012]

Hang in there Earl, a member of this forum is sure to come to the rescue. They have helped me out many times.

too stubborn to give up

thanks

Earl

 

[badglas]

check the injectors

Ohm test the injectors, if the test electrically ok, try a fuel pressure drop test. Watch the pressure as you fire the injector. You can have all the noid light flash in the world, but that does'nt mean the injector is actually opening.

Ron Kane
Benchmark Corvette Service
Bloomington Gold Restoration Workshop Instructor

 

[metoo1012]

Injectors are firing, pulled plugs, wet with gas, res. readings normal

thanks
Earl

 

[redvett]

Have you checked for plugged exhaust maybe a bad converter.

 

[metoo1012]

Have you checked for plugged exhaust maybe a bad converter.

dropped the y pipe and still runs for 3 sec. and dies
going crazy

noticed smoke coming out of intake plenum

 

[metoo1012]

Ohm test the injectors, if the test electrically ok, try a fuel pressure drop test. Watch the pressure as you fire the injector. You can have all the noid light flash in the world, but that does'nt mean the injector is actually opening.

Ron Kane
Benchmark Corvette Service
Bloomington Gold Restoration Workshop Instructor

pressure is steady

 

[rlg]

where on the plenum was it smoking?

 

[metoo1012]

light smoke or vapor out the front

 

[rlg]

out of the throttle body?

 

[iburyem73]

I have same problem

I have an 85 that is doing the exact same thing... have replaced fuel pump, ecm, fuel pump relay, iac; also not long ago the cap/plugs/wires/ignition module/and coil pack was replaced. Im having mine taken to a shop and put on a computer today and hopefully i can get us both an answer....have you checked the fusable link between the battery and ecm? Ive been told that can be a prob.

 

[metoo1012]

Replaced one fusible link and a lot of other parts.
anxious to here what the garage has to say.

thanks
Earl

 

[iburyem73]

They are going to be looking at it this afternoon or tomorrow morning...its already been towed there. I will post as soon as I know.

 

[iburyem73]

mine has two probs....the new fuel pump i put in did not have enough pressure so they replaced it and there was a bad wire on the back side of the distributor...he says it will be ready to be picked up...i will believe it when i am driving it..LOL

 

[iburyem73]

ok..that solved it!!! Mine runs great! The main prob was the wire on the distributor was only get electric part of the time...added in with the pump and problem solved...wish i would have taken it there first!LOL

 

[metoo1012]

ok..that solved it!!! Mine runs great! The main prob was the wire on the distributor was only get electric part of the time...added in with the pump and problem solved...wish i would have taken it there first!LOL

there is a 4 wire harness on the back side of the dist. that goes from the ignition module to a connector within 12 -14 inches of the dist. was that the one for your problem? I put a 12 volt load test on mine and it tested fine.

 

[iburyem73]

yes one of those wires was shorting....are your grounds all good?

 

[metoo1012]

Cleaned all of the grounds that I could find