Thread: 04 gtp cylinder #3 missfire

I have an 04 gtp and #3 cyl is missing ALOT, they have it narrowed down 2 injector, or burnt valve. My dad has been a mechanic all his life and says if you can hear it missing out the exhaust its def a valve. Wondering if anyone knows about this, also if anyone knows how to fix this as cheap as possible, but still want it done right. I live in Greenville WI. So if anyone knows somebody or a place that can do this cheap but GOOD Please let me know. Or if its possible that its somethin else. ( i plan on tearing the whole top end down and new valves and whatever else needs to be done port and polish, stuff like that.) Please let me know. THANKS!!

Well what have you done to try and fix it?

Have you done new plugs?

Have you switched coils to see if the misfire follows, did you do the same for the injector?



And

My dad has been a mechanic all his life and says if you can hear it missing out the exhaust its def a valve.

Of course you can hear a misfire out the exhaust, but that doesnt always mean its a valve. Like where else can the noise go???

Originally Posted by slgrnvlfire

I have an 04 gtp and #3 cyl is missing ALOT, they have it narrowed down 2 injector, or burnt valve. My dad has been a mechanic all his life and says if you can hear it missing out the exhaust its def a valve. Wondering if anyone knows about this, also if anyone knows how to fix this as cheap as possible, but still want it done right. I live in Greenville WI. So if anyone knows somebody or a place that can do this cheap but GOOD Please let me know. Or if its possible that its somethin else. ( i plan on tearing the whole top end down and new valves and whatever else needs to be done port and polish, stuff like that.) Please let me know. THANKS!!

you cant pin point a misfire by just saying its a injector or valve all the time, thats just silly.

when was your last tune up? have you checked the plug thats in cylinder 3 and checked it for damage? being #3 is in a heat sandwich, pistons do chip smash the plug, then misfire.



bad icm, bad coil, bad wires to the icm, or crank and cam sensors, spark pug wire burnt/melted to the manifold. so many things to check.

you can swap plugs around, coils, plug wires, or the injector to see if the misfire moves to help narrow it down.

At idol?

How about idle.

Check the plugs and wires. Probably needs them. Then get back at us.

Too add: sounds like you need a new mechanic. Theyz be dumz

post a vid if you can.

so the misfire came along, and then you did the tune up, or the tune up was done a while ago, and now its got the misfire?

did the misfire come after beating on it? does it make the cel flash when you floor it now? flashing cel happens for 2 reasons, clogged cat, or bad misfire.

if cyl 3 plug came out smashed when you did the tune up, the piston is chipped.

compression test been done yet?

you said everything as been done so far leads to a valve or injector, do tell us the whole story, chain of events, it helps us figure it out better. what has been done so far?

Swap the injectors and/or coils around and see if the misfire follows them or if it stays on #3. If it stays on #3, thenI'd have the piston inspected ala a borescope or do a leakdown/compression test.

Are you using 91+ octane in it? Is it modded?

compression test time

Also I merged these threads.

You only need one.

Don't multi-post problems just to get quicker answers...doesn't really work that way.

Probably chipped #3 then.

It needs premium or higher.

Welcome to owning a boosted car.

you can for free i may add. swap the coil packs around, the plug, and the wire, swap the injector, with the one next to it. do each thing one by one. the idea is to make the misfire move, if it does, the last thing you changed is the problem.

these coils can also crack, and not be seen so easy. and the icm's go bad, sometimes they test good, and they are bad. icm is what the coils bolt onto. icm = ignition control module.

all this can be done with a 25 dollar socket set from home depot or lowes. then keep it in the trunk so you have a few tools with you at all times. every car or truck ive owned i carry some tools with me, even the new trucks i had.

you need to run 91 or higher octane, or boom goes the pistons. even stock. read the owners manual.

if the piston is chipped, get a used engine for around 500, put it in. its what most here will do. rebuilding is costly due to machine shop work it will need.

most garages will charge in the $500 range to swap a engine.

look for a cheaper engine then 1500 for a 50,000 mile engine, its not gold, lol and thats over paying. 800 to a grand would be fair.

you also do not have to use a 04 and up engine, you can put a older year engine in the car as well.