1997 Grand Prix 3.8L...code for cylinder #3 misfire...I have changed plugs, wires, coil and injector and did a compression check (which was fine). The car seems to run ok when its cold, but once it warms up (10 miles or so) it misses and doesnt have normal power upon acceleration....any ideas???

SOURCE: cylinder 3 misfire

Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.

SOURCE: I am getting a misfire

Check the cap and rotor - if the contact point for cylinder number 5 is worn or corroded, or the edge of the rotor is smooth, you need to change them (the rotor's edge should look like the edge of a quarter, with ridges). If the contact point on the cap is worn out, it won't fire the plug.

There's a chance that the fuel injector for that cylinder isn't firing, so that would be something to look at if the electrical work doesn't fix the problem, but it sounds as if it's more of a problem with the electrical parts than a fuel injector.

Johnny Brown

• 5763 Answers
• Posted on Oct 24, 2009

SOURCE: Engine code states cylinder 2 misfire. Replaced

sounds like a bad injector, just connection at the injector, also check for leaks at intake, one more thing , do a compression test on that cylinder start there, good luck.

SOURCE: I have a random misfire code that comes up. the

is this a quad 4 ? if so you should replace the housing also , double platinum sparks plugs are advised also..

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