New girl from Michigan with misfire

[gogocricket]

Haha.. it's just that I've found myself borrowing it every time my car isn't working. Which has been a lot.

[Donkey]

The motor will not be in.. coming out tonight. It's probably going to be a PITA with the motor out too.

Depending on how it looks and how things measure out when it is apart, I may get it machined. Pretty sure my valves are fine, my rings are bad.

Right. What I'm saying is if your pulling the motor to rebuild it I would just do the heads as well. They have almost 100K miles on them. You don't need all new parts (valves,springs,keepers). You can reuse the old stuff with just some new valve stem seals. Clean up the old valves and just relap the seals (if needed). Hind sight is 20/20 . You would be pissed if you rebuild the motor,drop it in and 30K miles later the heads are leaking oil passed the valve stem seals or the valve clearances are off. The 02 uses shimed buckets that require a special tool to remove the shim and replace. 100x faster to do will out of the car.........

[gogocricket]

oooh i see. yes, i will probably do the seals on the valves. so far from what i can see, the valves themselves look pretty good. here are some pics..

[gogocricket]

jesus. cause of misfire= piston, and rings, missing chunks!

[TheJ]

jesus. cause of misfire= piston, and rings, missing chunks!

Holy cow!


Thanks for posting pics.

[mycologist]

Wow, excellent effort to get those out and thanks for sharing the pic.

Time to put some very serious thought as to what happened before starting your new motor with the old tune and hardware in place. Can we see the top too? Is it pitted etc.

I'm guessing this was severe detonation and the tune is all buggered up.

[SD_GR]

Wow, that explains it. Sorry for the terrible news, what a shame.

[Sinister]

whewww bummer

[gogocricket]

yeah.. here are more pics. the heads:

You can see the really black one that had the crap piston in it, that was cylinder 4

[gogocricket]

turns out my clutch and flywheel came out with the engine, so definitely replacing the clutch. i think i will get a lightweight flywheel as well. i don't think this clutch would have lasted much longer. not sure if you can see, but its worn nearly to the rivets. i'm surprised i never noticed any slipping or anything.

[SD_GR]

Take care though because too light a flywheel can lead to misfire codes.

[mangostick]

damn, def want to find out what aced those ringlands.. How does the bore look? The piston is pretty scary, I'm hoping it didn't ace the bore as well.

clutch looks like normal wear for the mileage, def good to catch that now too.

Good progress, not so great findings but nothing you cant recover. Keep us posted!

[gogocricket]

here are pics of random other parts. i still cant believe my car is in so many pieces. there is that injen CAI, and it looks like the uppipe isn't stock. other than that, i think everything is stock. i replaced an exhaust pipe with a hole rusted through it with the grimspeed one shown here. my exhaust from the turbo back is all stock. people have mentioned that maybe someone turned up the boost prematurely; how do i know if that is the case? how do you even 'turn up', (or turn down) the boost?

[gogocricket]

the block actually looked like it was in good shape. I can still see the cross-hatch pattern on all of the cylinder walls and there were no ridges. i'm pretty sure i don't need machining. just going to hone them all. i ordered a new piston, a set of rings for four pistons, all the rod bearings, and the clutch release spring today for 262.00, not bad.

[mangostick]

the block actually looked like it was in good shape. I can still see the cross-hatch pattern on all of the cylinder walls and there were no ridges. i'm pretty sure i don't need machining. just going to hone them all. i ordered a new piston, a set of rings for four pistons, all the rod bearings, and the clutch release spring today for 262.00, not bad.

awesome.. and not all that expensive for rebuild parts either. Very nice. Granted if I were in the same spot the testosterone and habit of overbuilding everything would have kicked in and I'd have gone a bit nuts on bullet proof internals.. but then again that would be very expensive ( and I wonder why I'm still single ) ..

As for boost, if the car was tuned at any point in time boost might have been increased .. or.. a manual boost controller could have been installed. <-- without a tune that may very well have caused a detonation problem. Or they could have just always ran crappy fuel in it that might have caused enough detonation to ruin the ringlands too.. no telling really. I would suggest installing a boost gauge just so you can monitor after the rebuild. They're generally not too expensive and fairly easy to install. What they are, is worth their weight in gold when it comes to ruling out leaks or overboost issues.