What does this mean? I've had 3 computers put in my car. The ECM has the old PROMM inside. Could this my problem all along? Or do I have some wiring problems.

 

The Quad Driver is used to activate high current loads like solenoids. Getting a Quad Driver code - e.g. DTC 26 - does not necessarily mean the "driver" module is bad, it could mean the load that it is driving it faulty. Are you replacing the ECM because you are getting a "quad driver" code? Do you have a specific code?

 

I replaced the ECM because I got a code 42. And, the computer was non responsive. Now I have a Quad Driver Failure.

 

Which of the quad drivers shows as failed? #1, #2, #3?
I am not sure about #3, but I know a faulty/removed air pump or EGR will cause #1 and #2 to fail.

 

I don't know which one it is. The guy didn't say. But it's missing hardcore. Starts missing at operating temperature.

 

I got that code when I unplugged my air pump at the track to run the fans on. Check the egr.

 

I changed my PROM when I did my heads/cam, but my QDM failure code stayed in the computer. It didn't go away until I changed the main ECM.

Don't the Quad Drivers control the injectors on a '93?

Frank

 

Injectors could be!!!

Turn your ignition on (engine off), and with a voltmeter poke the terminals on each of the injector harnesses. Pink Wire is 12V, and the other wire (forget color) is the ground.

So poke the harness slot for the pink wire (12V power) and the harness slot for the ground wire. If you get a power reading (12V), then your injectors stay open, which will cause misfires, and lousy fuel mileague.

Let us know, and give us some feedback

 

I had injectors installed today. When they checked the ECM the Quad Driver Failure came up.

 

I am not saying your injectors themselves are bad, I am suggesting that if that error codes is related to the injector drivers a good way to test would be that.

Follow me.

With the ignition, the ECM is suppose to supply 12 volts of power to each injectors harness (pink wire).

Now keep in mind that an injector is opened when both power and ground is given to it. This means the ECM fires each bank of injectors by grounding the ground wire. (blue or green).

So the test simply suggested to probe the pink wire slot on the harness (power) and probe for ground by probing on the blue wire (ground). If the voltmeter reads voltage, this means that the blue (ground wire) is grounded, therefore your injectors are always open.

Just a suggestion.

 

I can't test it. It's still sitting at the shop.