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Old 04-04-2016, 04:13 PM   #1
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Quad driver module misfire

I'm 17 years old and I worked all summer to buy a 1993 camaro. I bought it for 1200 and I knew the head gaskets were blown so I took apart the engine refurbished the heads and now it runs but there is a pretty bad misfire. At first I thought it was the distributor only because the previous owner had a new distributor in a box in the back but I never meet the previous owner so I couldn't ask him. So I jumped the obd port and it read me an error code 26 (I was very surprised there was only one error) but that is the quad driver module and being a module I don't see how that could cause the car to misfire. But then I read that it has to do with the injectors, air pump, and 2 solenoids and that's about all I know so I guess that could be the reason for the misfire but I am super confused on what to do now to fix it so if anyone has any ideas or anything that could help it would be much appreciated Click image for larger version

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Old 04-04-2016, 05:18 PM   #2
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You most likely need a new ECM.


Contact a company known as PCM for less.
PCM for Less


Even though it is called PCM for less, they should still have ECMs for 93 model years.
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26PPH injectors.

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Old 04-04-2016, 08:26 PM   #3
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But why would a module be causing me to misfire? The injectors seem to be working fine and I'm not sure how that could be bad is there a way I could check it and or check the injectors or at least see which cylinders it's misfiring in?


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Old 04-04-2016, 09:19 PM   #4
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There's no way to test the driver, you can use a noid light to test if the injectors are getting a signal. You can use a mechanics stethoscope to listen to them fire while the car is running. Most likely the misfire will be random. When diver modules fail they can still fire the injectors but they can't time them correctly or manage PW properly.
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Old 04-04-2016, 10:18 PM   #5
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Quote:
Originally Posted by jordan7736 View Post
But why would a module be causing me to misfire? The injectors seem to be working fine and I'm not sure how that could be bad is there a way I could check it and or check the injectors or at least see which cylinders it's misfiring in?


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Because of an injector not pulsing properly.
Each cylinder has an injector.
If one injector doesn't pulse, that cylinder ( that has no fuel to drive the piston down ) registers a misfire by way of the crank position sensor.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 217k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles
26PPH injectors.
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Old 04-05-2016, 07:19 AM   #6
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Okay thank you guys


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