91 L98 doesn't start
Thread Starter
Cruising
Joined: Feb 2012
Posts: 10
Likes: 0
91 L98 doesn't start
My 91 l98, will not start. It will run on starting fluid only. Soon as I quit spraying it dies. I have 45 psi on the fuel, spark is good also. I have a feeling the injectors aren't pulsing. It doesn't show a code, just 12 which I think means it didn't find anything. I'm open to any suggestions
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You can check the voltage on the injectors to see if the ECM is pulsing them. Use a DVM or test light to probe an injector connector while cranking. One will show 12 volts all the time (from the INJ1 or INJ2 fuse). The other will pulse (light green or light blue wire). The ECM fires all 8 injectors at the same time so it doesn't matter which bank you check.
The three most obvious reasons for no injector pulses are VATS, high TPS voltage and no reference pulses from the distributor. VATS is probably OK if the engine cranks.
The three most obvious reasons for no injector pulses are VATS, high TPS voltage and no reference pulses from the distributor. VATS is probably OK if the engine cranks.
