Misfire @ WOT
 

I've developed a misfire at wide open throttle.
Car runs fine under normal acceleration.
One member suggested changing the plugs.
You can see my mods in my avitar
Any other suggestions on sourcing the issue before i pull the plugs?
Can anyone link me to a good DIY article on plug r&r?

Thanks guys

Uh, did you get the codes? plugs and/or coil packs....check renntech for DIY.

99% its the plugs.

Haven't got any check engine faults on dash.

Can i have my ECU read to determine if my coil packs are putting out to spec?

Any links to good coil pack threads?

Coil pack #5 is very common.

I had the same issue until i changed out the plugs...............

Hey guys, I think I have a similar problem, misfire on cyl 4 at WOT and high boost. Car starts to shutter almost like tire hop.

I just did plugs a few months ago, so probably a coil pack. Two questions:

1. Is it wise to just replace the coil tubes or should I just do the entire coil pack?

2. Since I just did plugs, I am not too interested in getting in there again this soon. It only happens at WOT with high boost going. I can keep my foot out of it for a while. Is a misfire a serious enough problem for me to correct right away, or can it wait and I will keep my foot out of the pedal?

Thanks!

If you are alrready in there you should replace the entire coilpacks and plugs. The coilpacks are about $40 each

have an 01 seemed to misfire on hard acc it was the maf. get some elec cleaner at ace hardwear it's a 4.00 fix... i chose to do this last after replacing my pluges, coilpacks, softwear and i can't remember what else.... try the maf even a new one is cheapo and ez to install

Hmm. Would a dirty MAF cause just one cyl to misfire?

are there any threads DIY articles on testing the coilpack and maf either by diagnostic tools or ?

Seems like replacing component after component is not the most effective solution..

Have a happy 4th all...............Geno

If it occurs at about 4500 it's most likely plugs

I vote plugs too. Mods eat plugs quickly.

Change the plugs and the coil packs.
I used the Bosch plugs and coil packs and it solved my problems.

My coil packs had been in there for about 8 years but my car has only 40k miles on the clock. Every coil pack had a crack on it. They dont last forever!

Andy

So your saying when i'm in there is the best time to do both?

This will be my first time doing plugs on a 996TT

What is the total cost for the coil packs and where to buy?