94 grand am missing

[mrsmuddtoy]

Okay here it is I have a 94 grand am 2.3 liter single overhead cam with a little over 108,000 miles on it, well it has been sitting for 2 years and three shops later and tons of money we are still at a lose. Here is what has been done injector cleaned and replaced, converter replaced, new spark plugs and plug wires, new computer (ecm), crank shaft sensor, cam positioning sensor, oxygen sensor, new coils, and two new coil towers. The timing chain is right and in good shape and the fuel pump and fuel filter has been replaced as well. I took it to the shop and they told me to replace the coil tower first after starting missing it fixed the problem for about the first 3 weeks. It then started missing again,and all of this has been done to it and still no help. The converter was replaced and it then started and was driven but had no power and the converter turned red. We have considered replace the MAp sensor next but I was looking for someone elses input and insightinto this matter. When it was hooked up tot the computer at the last shop that it was at they told us that it was to unstable to finish the test and it would not start and stall for them to find a code and then there was nothing... PLEASE HELP WE HAVE DONE EVERYTHING!!!!!!!!

[Slade901]

99.99% the problem is the Ignition Coil Housing $60 which are a crappy design and fails most of the time with our Quad4 engine. You can replace it yourself

[mrsmuddtoy]

thats been replace not once but twice and DID not fix the issue.

[Slade901]

I just want to clarify what I meant by Ignition Coil Housing. Ignition Coil Housing is not the same as the Ignition Coil Towers. Since you did not mention that they have replaced the spark plug boot connector and ICM (Ignition Coil Module), I would check it.

With Quad4 engine, it does not use any spark plug wires. Instead is uses a spark plug boot which connects the spark plug to the Ignition Coil Housing. The two ignition coils and the ICM sits on the Ignition Coil Housing.

Check the crankshaft position sensor wires to make sure its wire is not rubbing on the engine block. If the cps wire is rubbing the engine block then the ICM will be getting incorrect reference signal and will in turn fire the ignition coils to fire incorrectly which shows as misfire.

[april15_]

I have a 94 grand am with 103,000 miles that had the same problem. 6 months of frustration and wasted money until finally someone figured it out. It was the ignition coil housing, just as Slade said.