View Full Version : Car is missfiring- help!


Ell Ess Won
09-19-2006, 05:30 PM
It doesn't do it all the time, but under acceleration the car will missfire and kind of stumble. This has been happening only after I changed the plugs a few months ago. I checked to make sure all the wires and and everything was in tight. No SES lights. Is there any way to tell if I have a bad plug?

brandons02
09-19-2006, 06:23 PM
What type of plugs did you use, also check and make sure you didnt cross you plug wires. Not sure but if the plugs look really white that means your running lean. you could unplug your wires one by one and see which one changes how the engine runs, normally if you unplug a wire and nothing changes that plug or wire could be bad.

Ell Ess Won
09-19-2006, 06:34 PM
NGK TR55 and the stock wires. what do you mean by cross my plug wires? Will it hurt anything if I pull a wire out from the top one by one if the engine is running?

rune02
09-20-2006, 06:39 AM
you mite get juiced if you do it was it was running

Camaroz
09-20-2006, 07:48 AM
Coils hurt.

blown 346
09-20-2006, 09:49 AM
I would pull off all the plug wires and bend them and inspect the whole plug wire this way. You will notice cracks etc while the plug wire is bent. Check inside the plug wire as well.

Ell Ess Won
09-20-2006, 04:00 PM
Checked the wires and it doesnt look like anythings wrong. Could it be a dirty fuel injector?

The PAT WS6
09-20-2006, 05:43 PM
hmmm doesnt sound like ur spark plugs. and ur sure its missfiring? the ses should blink if it miss fires.

gr8one99SS
09-20-2006, 06:20 PM
check to make sure all the wires are well seated it happened to me a while back

Ell Ess Won
09-20-2006, 06:39 PM
ya all the wires are in from what I can tell. Under acceleration sometimes the car pops and hesistates.

Domestic Demon
09-20-2006, 07:06 PM
What type of plugs did you use, also check and make sure you didnt cross you plug wires. Not sure but if the plugs look really white that means your running lean. you could unplug your wires one by one and see which one changes how the engine runs, normally if you unplug a wire and nothing changes that plug or wire could be bad.

It's pretty much impossible to cross the plug wires on an LS1 - the coil packs are directly above each spark plug. If the wires were crossed, you'd evidently see it - they should go straight down from the coil pack to the plug.

I'd check to make sure all the plugs are screwed in snugly and that the wires are all the way on the plugs. They can be a real bitch to get on sometimes, if they don't "snap" on, they usually aren't on all the way. I'd just pull them all off and re-install them, making sure each one snaps onthe the coil pack as well as the plug.

blown 346
09-21-2006, 06:07 AM
You could have washed out the plugs.

Dex
09-21-2006, 09:53 AM
I'd pull all the plugs out and inspect them.

LT1-DAN
09-24-2006, 11:05 PM
maybe a bad coil pack? :confused: