silver8ts

i have a 91 corvette with a 5.7 ltr. i am getting fuel to the rails, i have spark, but i have no injector pulse. i replaced the pcm, and the ignition module. still have no pulse, i checked all of the fuses. if i spray starting fluid in the manifold, the car will start and run for 30 seconds. do you guys have any suggestions???????

01ssreda4

iTrader: (96)

by what you describe it sounds like you are getting spark but maybe low/no fuel

ds98formula

iTrader: (3)

Check the cam shaft positon sensor as well as the crank shaft positon sensor not sure witch on that model uses for a refrence signal to fire the injectors.

1 Bad Ass Formula

iTrader: (7)

Sounds like an vacuum leak at the manifold. Whether between the throttle body and manifold or Manifold & engine. Check & make sure that the fuel rails are seated properly first and then go on. I had an issue when I installed an LS6 intake on an LS1 engine similar that turned out to be the gaskets on the LS6 intake.

lovescamaros28

http://www.2carpros.com/first_things...wont_start.htm

Maybe this will help.It could be a lot of things...would have to be there to troubleshoot the problem.It could be anything from a Crank Position Sensor to a Throttle Position Sensor on your throttle body stuck in the WOT position during start up and causing the ECM to go into "clear flood" mode.

intense3123

+1 on crank or cam sensor

02 35thLE

iTrader: (3)

Check and see if you have power at one of the injector connector wires with the key in the run position. There should be power at one and the pcm pulses the other one.

99RTA

iTrader: (-1)

I'm gonna guess its a vats issue......if the computer doesn't see the square wave form from the secuity module it will NOT enable the fuel injectors. If this is the case you have a few options.....one install a square wave form generator....two tune out the secuity feature in the computer or repair your security system.

silver8ts

i got a scanner. i have no rpm signal. this vehicle dose not have a crank sensor. i have plenty of fuel, no injector pulse!!! any other suggestions?

thanks guys