86 Vette not running

**metoo1012** · 04-20-09, 07:44 PM

VATS by passed with bypass module, verified by pulling fuse on vats system, dead. installed bypass module and have fuel, injectors and spark

**metoo1012** · 04-21-09, 04:29 PM

IAC motor is new.

HELP!!!!!

**rlg** · 04-21-09, 05:59 PM

what about the ignition control module?

**vetteboy86** · 04-21-09, 06:35 PM

Pull a plug, put it back into the plug wire boot, and then lay that against a good ground. Use a bracket or something so that the hex part of the plug (where the socket engages the plug) is touching a ground. Have someone turn the car over while you watch the spark. It should be blue if it is strong. If it is orange than the spark is weak. Either way this may not be your problem.

The next thing I would do is disconnect the fuel pump. Turn the the ignition over for at least 10-15 seconds and make sure spark is happening the entire time while cranking the motor over. Next put a timing light on #1 and verify the timing is close while cranking. If that is the one you pulled put it back in now.If the timing is close, than put the plug back in, and plug wire back on. Hook fuel pump back up. Now pull the EST wire that connects to the distributor. This is the electronic spark timing wire. It is brown, and has a brown connector I believe. Start the car again, and verify timing. See if the car runs with this wire unplugged. It will throw a code, not sure what it is off the top of my head.

How does it run for those few seconds while it is running? Does it pop and back fire through intake or exhaust? I am wondering if the spark control isn't correct. Try these things then get back to us.

Craig

**The Car Whisperer** · 04-21-09, 07:12 PM

Originally Posted by metoo1012

IAC motor is new.

HELP!!!!!

Is the IAC adjusted properly? There is a procedure for this. If you don't adjust it using the prper procedure the engine will not idle properly. Here's a procedure I found online that I have used on my 86 L98 when I installed a new IAC. I hope the author won't mind -

**metoo1012** · 04-22-09, 01:24 PM

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** · 04-22-09, 01:25 PM

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

Earl

**The Car Whisperer** · 04-22-09, 03:54 PM

Originally Posted by metoo1012

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** · 04-22-09, 05:29 PM

Originally Posted by The Car Whisperer

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** · 04-22-09, 10:57 PM

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** · 04-23-09, 03:05 PM

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

thanks
Earl

**redvett** · 04-23-09, 03:23 PM

Have you checked for plugged exhaust maybe a bad converter.

**metoo1012** · 04-23-09, 04:23 PM

Originally Posted by redvett

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** · 04-23-09, 04:27 PM

Originally Posted by badglas

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