Hello everyone.

I have been trouble with my 1991 Firebird v6 and cant seem to fine the problem. For background story click -https://www.thirdgen.org/forums/elec...d-v6-vats.html

Today I drove it to my local auto parts store thinking I had fixed the engine trouble. But when I came out the thing would not start. It would start stay on for about a minute and then while driving it would just shut right off.

So I left it there and decided to check the codes on a code reader.

The code reader then displayed the following "Code Errors."

33. High voltage (low vacuum) at mass air flow sensor (or MAP sensor)
43. Low voltage at electronic spark timing circuit
54. Low voltage at fuel pump OR Low voltage at Fuel pump relay OR Output failure at quad driver module.

Now I'm not exactly sure what these codes mean or how to fix them so if anyone could help it would be greatly appreciated.

I do have a feeling though that it has something to do with the fuel pump because it sounds like the engine is starving for of fuel.

I put my ear to the gas tank while we tried to start it and I could not hear the pump running.

So, my first thought is the fuel pump. But still am unsure.

 

Get a manual and a VOM ( voltmeter) and start checking the voltage at the battery and alternator ,then the terminals from the ECU to the relays, etc.
I had to break ALL my electrical connections and clean them .Then use an anti oxidation paste upon assy. After almost 20 years, corrosion is your worst enemy.
Good luck

 

43 Can Be either high or Low Voltage.. Check your grounds.....