need some diagnostic help.

[my fear]

You can see misfire counters looking at mode 6 data. It will show misfires long before the check engine lamp comes on. Test I'd 53.

I've got a full set of good used 4 valve coils I bought as spares when I had mind converted to cop, I've since gone back to coil packs and wires. Pm if interested.

im pretty inclined mechanically but i don't know what this is sry. i have a scan tool but only scan trouble codes.

[dee]

You'll need one that is capable of giving you live data.

[turbostang]

If you're not getting a CEL, I'd be worried - especially considering it's a stock motor.

Like mentioned above, I'd be looking for a broken ring land. Most cars will run fine like that, but lack some power. Did you gap that one plug back properly? If the gap is too wide, it will misfire like a mofo.

I'd ask around for someone who has a bore scope so you can check the pistons.

[00pooterSS]

yeah ever since i regapped the plugs i have 0 issues unless i punch it. so im gonna buy a single coil and go 1 by 1 and see if i can just find the bad one myself. and no the car goes rich when its starts misfiring, i have and a/f gauge in the car and have looked at it the few times i made the misfire happen. thanks everybody for the helpful information.

Damn, have fun with that!

If you get desperate, come to Rowlett, I have a scanner that reads live misfire data. I have found it's hit or miss on some vehicles though, I used the misfire counter recently on an F body but for some reason I'm thinking it doesn't have the live misfire data for Ford. I will have to look and see.

[turbostang]

..I forgot one thing. When a car 'misfires', 99% of the time it shows lean. Usually by way of big spikes in the AFR. This is because raw oxygen is pumped out the exhaust (not being consumed by combustion) and is picked up by the 02 sensor as 'lean'.

So, if you are truly seeing 'rich' spikes it's one of two things, it's the ECU trying to correct the lean condition that it's really seeing OR You have another problem.

Also, one last thing, if you are seeing any movement on the guage as far as AFR is concerned, what ever you've seen has already happened many milliseconds ago - the problem has already come and gone and the damage, if any, has likely been done.

[my fear]

thank you very much for the responds but i replaced the plugs and coils and she runs fine again. do i still need to be concerned? she doesn't seem to be down on power, and about the closed plug, i carefully looked at the end of the plug and didn't see any marks on it like something hit it. it was just bent down.

[ktm300hater]

I'd ask around for someone who has a bore scope so you can check the pistons.

This

[00pooterSS]

thank you very much for the responds but i replaced the plugs and coils and she runs fine again. do i still need to be concerned? she doesn't seem to be down on power, and about the closed plug, i carefully looked at the end of the plug and didn't see any marks on it like something hit it. it was just bent down.

If it runs fine now you found the problem. If you had broken a mechanical part it would still be acting up. Drive it around for a day or so easing in to it and keep a close eye on everything. If the A/F etc seems fine then write it off.

I would be a little concerned with it being so hot and this happening around the time of year it started getting hot. How sure are you that the tune is spot on?

[my fear]

If it runs fine now you found the problem. If you had broken a mechanical part it would still be acting up. Drive it around for a day or so easing in to it and keep a close eye on everything. If the A/F etc seems fine then write it off.

I would be a little concerned with it being so hot and this happening around the time of year it started getting hot. How sure are you that the tune is spot on?

to be honest the tune is not 100% but not much i can do about that since i paid a shop to do, and cant tune myself.

[00pooterSS]

to be honest the tune is not 100% but not much i can do about that since i paid a shop to do, and cant tune myself.

Running a boosted car without a spot on tune is a really really bad idea, especially in this heat. It may have detonated. Get a top notch tune or you may be buying a new motor soon and then doing a proper tune.

Glad it's fixed, sucks about the wasted money, get it to a good tuner and you'll be happy that you'll have the peace of mind that it's right.

[Andy@PrimeTuning]

The bad coil(s) can and will cause detonation and that is more than likely what closed the plug gap

Glad you got it figured out

[my fear]

i mean it was tuned at hpp but there are some small daily driver stuff that needs to be ironed out thats all...

[BlueCoupeRedVert]

i mean it was tuned at hpp but there are some small daily driver stuff that needs to be ironed out thats all...

Their tunes are good for life right??? Take it back in and get it checked.

[my fear]

i need to just time, trying to close on my house and move and blah blah blah