PSI Conversion

[dhutton]

I thought the TCC (Torque Converter Clutch) signal was only needed with the auto trans. At least that was the case with the LS1 builds I did.

Is the car cranking? Is there provision for a clutch safety switch in the harness?

A lot of guys make the mistake of connecting the ECM power to the power that is not hot when cranking. It needs to be connected to power that is hot both when cranking and running.

Don

[Swain]

Put a new cam sensor in still not fire.

[andrewb70]

Originally Posted by dhutton

....
A lot of guys make the mistake of connecting the ECM power to the power that is not hot when cranking. It needs to be connected to power that is hot both when cranking and running.

Don

^^^This...

Andrew

[gerno]

I used PSI and had a firing issue too due to the tune and VATS. I had to add a wire to the harness and put it to constant ground. I forget exactly which one it was but will see if I can find it tonight.

You can and google it to come up with the wire, that's how I figured it out.

[cpd004]

Do you have fuel at the rail?

[Swain]

Yes fuel at rails. I did notice the power dropped from 12v to 9.8V when cranking so I'm charging the battery. Maybe the ignition switch could be bad also. Trying to figure this out.

[cpd004]

When cranking, do you have spark?

[Swain]

No spark

[Vega$69]

With a PSI harness you do not need a brake switch with a manual.

If you wired in a neutral safety or clutch switch it would not crank so thats not the problem.

When you first turn the key on you should hear the fuel pump run for a few seconds. That would indicate the fuel pump relay is working.

Then you need to determine if the ignition relay is working. The easiest way is to touch the relay and have someone turn key on to see if it clicks on.

The other common issue with not starting is the ground wires that attach to the head are either not connected or loose.