Brock Nation

I lost the key so I put a new one in but the security won't let the fuel injections work how do I bypass it the starter will work it just won't let it get fuel need help

JackDidley

You dont have VATS on an 85. Its not the security keeping it from starting.

383vett

A car with a vats system would not crank if a key with the wrong pellet was used.

Brock Nation

Does it change for an 86 or is it the same

JackDidley

86 has VATS. That will cause a no crank situation.

Brock Nation

How would I bypass it or fix it

belairbrian

There's nothing to bypass on an 85. You need to troubleshoot why the injectors are not providing fuel.




I'm guessing you don't have a set of Noid lights. So how did you determine the injectors aren't firing. Might want to see if the local parts store can loan you a set.


Start with a simple test.


1) when key is turned to run do you here the fuel pump turn on?
If not check fuses, if fuses are good time to troubleshoot why the fuel pump isn't pressurizing the system
2) If #1 is yes do you have fuel pressure? Will need a gauge to determine this.

Brock Nation

I can take a wire and ground it and the fuel injectors will come on and it will start but won't run for long and start itself I just can't get the key to start it and keep it running

Cliff Harris

Disconnect ALL the injectors. All the injectors are connected in parallel and if even one other injector is connected you will get a misleading reading. Then check one injector connector on each side for voltage (both pins) with the ignition on. One pin should have approximately 12 volts and the other should be near zero volts. There are two fuses for the injectors, INJ1 and INJ2. They are where the 12 volts comes from, one for each bank. The other side of the injector connectors goes to the ECM.

You can damage the injectors if you ground the ECM side. They are not made to have continuous voltage applied to them.

Does the fuel pump run for 2 seconds when the ignition is turned on? What fuel pressure do you have at the fuel rails? On my car the fuel pressure is about 44 PSI when the key is first turned on and drops to about 40 PSI when the engine starts. That is controlled by the vacuum line on the fuel pressure regulator.

TBSS/85vette

IT may sound dumb but did you install a new ignition switch? I would make sure it's installed correctly if you did.

belairbrian

I think the OP needs to verify what car he has.


he has a second thread asking the same question for an 86.


I believe the responses would vary significantly between 85 (non-vats) and 86 (vats)


But if the starter is engaging and the engine is turning, the issue is not VATS.

Joe C

Cliff Harris

The ECM turns on the fuel pump when it sees DRPs (Distributor Reference Pulses) from the ignition module inside the distributor. If the ICM (Ignition Control Module) is bad or the connection between the ICM (4 wire harness that comes out of the back of the distributor) and the ECM is open, then the fuel pump will not run. The ECM needs the DRPs to synchronize the firing of the injectors to the rotation of the engine.