Misfire cyl-2 plug,wire,coil pack fine injectors fine no vacuum leaks,smoked engine,compression test all fine

Bruce Bracey

• 1000 Answers
• Posted on Mar 31, 2009

SOURCE: 1998 pontiac grand am misfire cyl 4

I'm a bit confused concerning your spark plug wires as the standard 2.2 engine does not have them, so my suggestion is based on the 2.2 engine as the 4 cylinder you state you have.
If the secondary electrical has been replaced, I would suggest inspecting the fuel injectors for operation.
The easiest way to test the operation of the fuel injectors is to listen for a clicking sound coming from the injectors while the engine is running. This is accomplished using a mechanic's stethoscope, or a long screwdriver. Place the end of the stethoscope or the screwdriver (tip end, not handle) onto the body of the injector. Place the ear pieces of the stethoscope in your ears, or if using a screwdriver, place your ear on top of the handle. An audible clicking noise should be heard; this is the solenoid operating. If the injector makes this noise, the injector driver circuit and computer are operating as designed. Continue testing all the injectors this way.
If all appear to be functioning we can move on to the next suggestion.
Let me know.
Regards.

SOURCE: I have a 1996 Pontiac Grand AM GT 2.4 L. I got a

fuel injector sound like the problem if you have checked the power with a node test the injector and you have pwer then mest likely the ijector is clogged ,so first make shure you have power to the injector hope this is helpfull

SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my

A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

SOURCE: possible vacuum leak dont know what else

What codes did auto zone tell you? You wrote it down,along with the explanation? Why replace the coil packs? You did some kind of test first? You need to spend the money on education first,then test equipment,then parts.

SOURCE: 1999 Grand Am 3400 v6 misfire.

I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.