3800 Misfires

[BoostInside]

My car starts misfiring crazy at WOT, if I ease into it its fine, but if I punch it it bogs down and misfires. usually starts misfiring at around 3.5-4k

anyone have this issue?

VS cam, 3.4 pulley, just did plugs with GTPictor (NKGs 1 heat range colder plugs) and custom DHP.

help?

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[Fish]

Just did plugs??

Check your wires at the plugs and on the coils. Make sure they are secure. Very easy way to get a misfire.

 

[BoostInside]

Originally posted by Fish@Mar 11 2005, 09:01 AM
Just did plugs??

Check your wires at the plugs and on the coils. Make sure they are secure. Very easy way to get a misfire.

[snapback]75081[/snapback]​

did that .... or I should say Pictor did

 

[imported_GraFFix]

How old are the wires? what did you gap the plugs at? Were the tips on the plugs tight? NGK's have those screw in tips that can come loose if there not tight? hopefully thats not the case though you dont want those little electrodes bouncing around on your cylinder head...
Have you scanned the car and found out which cylinder has the misfire?

just one thing to double check cause i was having an issue with slight random misfires...turns out that one of my plug wires wasnt that tight on the plug and would start to slip off over time...they looked ok and felt tight but I would have to push down on the wires all the time once it started to misfire then it would be fine for a week or so...I eventually trimmed the boot down so it would slip further down and it hasnt slipped yet.

 

[BoostInside]

Originally posted by GraFFix@Mar 11 2005, 12:29 PM
How old are the wires? what did you gap the plugs at? Were the tips on the plugs tight? NGK's have those screw in tips that can come loose if there not tight? hopefully thats not the case though you dont want those little electrodes bouncing around on your cylinder head...
Have you scanned the car and found out which cylinder has the misfire?

just one thing to double check cause i was having an issue with slight random misfires...turns out that one of my plug wires wasnt that tight on the plug and would start to slip off over time...they looked ok and felt tight but I would have to push down on the wires all the time once it started to misfire then it would be fine for a week or so...I eventually trimmed the boot down so it would slip further down and it hasnt slipped yet.

[snapback]75135[/snapback]​

haven't scanned the car yet, planning to.

Wires are new, plugs are gapped at .06 .. I think, double checked the wires when we did plugs, they are nice and snug.

almost thinking its coil packs or ECU .... anyone have problems with those?

 

[sr71_rgl]

Originally posted by BoostInside+Mar 11 2005, 12:47 PM-->

<!--QuoteBegin-GraFFix

@Mar 11 2005, 12:29 PM
How old are the wires? what did you gap the plugs at? Were the tips on the plugs tight? NGK's have those screw in tips that can come loose if there not tight? hopefully thats not the case though you dont want those little electrodes bouncing around on your cylinder head...
Have you scanned the car and found out which cylinder has the misfire?

just one thing to double check cause i was having an issue with slight random misfires...turns out that one of my plug wires wasnt that tight on the plug and would start to slip off over time...they looked ok and felt tight but I would have to push down on the wires all the time once it started to misfire then it would be fine for a week or so...I eventually trimmed the boot down so it would slip further down and it hasnt slipped yet.

[snapback]75135[/snapback]​

haven't scanned the car yet, planning to.

Wires are new, plugs are gapped at .06 .. I think, double checked the wires when we did plugs, they are nice and snug.

almost thinking its coil packs or ECU .... anyone have problems with those?

[snapback]75146[/snapback]​

[/b]

.060 seems too wide of a gap. I'd try a smaller gap and then test again with more WOT runs. My car is very sensitive to plug gap and will only misfire/hesitate when WOT above 3500rpms if the gap isn't just right.

 

[jk99gtp]

Also, you might want to make sure there arent any injector issues going on also..

Might be time for a can of chevron techron thru the tank and/or fuel injection cleaning...

 

[Royalgtp]

.060 sounds big as hell for a cammed car.


I think you want to at least be around .056 or so....

I think Im around .55 or so.....with the IC and 3.0


My MAF was messed up and that was causing my car to rev and misfire all over the place.