Thread: Engine go put-put-put-glug-glug-glug - Muliple misfires - lost 03 GP GT

Where in MN are you?

I'm willing to bet because of that bad rear 02 sensor its dumping fuel like crazy and it plugged up your cat converter and thats your problem.

Cats clogged

X3 on the bad cat. and the o2.

Yup, may be the O2 sensor. If you have a OBDII scanner (depending on which type you have) You could read the O2 voltage which should be no less than .2v and no more than .9v. And remember, the cat usually dont go bad on its own( usually burning oil, unburned fuel, incomplete combustion, coolant getting in there, too rich, bad 02 sensor, etc. causes the cat to go bad) But as mentioned, its probabaly the O2 sensor but dont go swapping out the CAT or anything else without finding out the source of this issue, otherwise your new CAT and whatever else you buy would just go bad also....

In 4 a uim failure about to go down as well

We dont got a timing belt.

Timing chain ftw.

You should probably do that and get ready to change your upper intake manifold as well

the N/A engine is known for the upper intake manifold gasket to fail, when it does, it dumps coolant into the engine oil, and kills your engine, most call doing the upper intake and lower intake manifold gaskets maintenance, due to the old plastic gaskets failure rate. and peace of mind.

Scott...always right there with a youtube link. A porn link.. a great word of advice and yet...this time...no link?

Here ya go guy. Read up and learn about the engine's usual failures. I'd agree your current issue is most likely an O2 that clogged a cat.
http://www.grandprixforums.net/97-03...ure-60667.html

yeahh, scott its not the gasket that goes bad, its the whole upper intake.

If you go through Bill's thread, you will find that on an n/a engine, there is an egr stove pipe that is presses into the lim, this pipe goes up through a tunnel into the uim (upper intake manifold), on each side of this tunnel, there are two coolant passages to allow coolant up into the throttle body to keep it cool...honestly doesn't help in my and most peoples opinions. After years/milage....the egr tunnel goes through many heat cycles and wears through to the coolant passages because the stovepipe is right against the tunnel.

The revised Dorman Intake Manifold ( PN# 615-180)...which can be purchased at most every parts store, most all of them will have it in stock, comes with a new stovepipe that is the same base diameter to be pressed in the lim, but has a smaller pipe diameter as to not be so close to the tunnel walls.

Almost got it all Mike. The coolant is for keeping the TB from icing at the north pole. Which I've never heard of it being an issue and for how little coolant is in the TB.. it's sad.

The replacement UIM's can still have the issue. It's all about heat cycles etc.

true, but with the smaller pipe..it is alot less likely to occur

Lim gaskets are partial cause... Main cause is the big black hunk of plastic sitting on top.

Oil cant get into the cooling system, but trans fluid can from the side trans cooler tank on the rad.

Or it could be that the air in the coolant system mixed with your dexcool and sludged it all up.

If you ever wanted help doing those intake gaskets I might be around to lend a hand, but you might be a far drive.

So it was an intermittent problem? Thats always the main issue when you cant find a problem, some damn wire somewhere.....

Was the ICM affected in any way?