Thread: Here lies my currently dead prix......but will be bought back to life!!

McFly - I did pretty much all of the same work as you, with the addition of new heads.
I still have some hesitation, and i believe it is a clogged catalytic converter - I will find out for sure this weekend when I cut it out & weld in a straight pipe.

OMG! You are right! I released the upper bolts of the cat, and REV REV REV! It was the cat on my car as well!

I guess my cat must have got full of water/junk when the Manifold Gaskets failed.

Edit: I'm wondering now if the reason the Gaskets failed, which was because of overheating, was caused by the cat going bad. In other words, I wonder if the cat was going bad, which caused it to overheat, which caused the Gaskets/UIM to fail. I'm just happy my car is running again (well, very loud, until I get the cat back on).

that's not a downpipe.

Originally Posted by crazyguy03

all that work and no top swap?

it's a 97. the vac assisted 4t60 would explode after a few weeks

Originally Posted by spider4

Well guys my car has been running decent for the last few days since we put it back together. It does now have an annoying rattle when the car is in drive and car is stopped or slightly moving. But otherwise decent. Although i do find myself looking at a 02 grand prix now lol.

GREAT NEWS! Very good to hear!

Rattle? Did you forget something? I had a rattle before, and now it's gone!... It was the PCV valve, funny actually. That was a nice surprise to find when I opened my new LIM gaskets package. Even nicer when I found out mine was bad.

Originally Posted by Nixon

that's not a downpipe.

Oh, Ok. Well, it's a decatted section of pipe that goes down from the Manifolds, and to the mid-pipe of the exhaust. I don't know. Coming from the standard naming convention from the other cars I've worked on, that's what I thought to call it.

Originally Posted by zach101

its called the domino effect mcfly lol

I was actually thinking about this today. You are absolutely right. To explain it... The faulty EGR design caused the upper manifold to crack, which then leaked coolant into cylinder 1, which caused it to misfire, which caused the coil to go bad because of the plug shorting out with the water causing feedback to the coil, which then caused more misfiring, which then caused the motor to be over taxed and overheating, while also leaking away the much important coolat, which then resulted in low coolant, overheating even more, causing the lower manifold gaskets to crack and leak making matters worse, so much that the engine began to steam clean itself with vapor, causing carbon deposits to flake off the combustion chamber, which then ended up in the catalytic converter, causing the catalytic converter to clog, then causing the engine to be even more overtaxed, to the point that the engine could not take it anymore, overheated even more, hurt the water pump gasket along the way with such overheating, and then completely lost all ability to even stay running, no matter how hard I tried to gas it OR try to starting it with the failing cylinder(s) removed from the circuit without sparkplug (two bad cylinders).

Results, bad upper manifold, bad coil, bad gaskets, bad catalytic converter, bad waterpump gasket.

Oh well, I replaced the bad EGR design with a better one (aka redesigned upper manifold), sealed the coolant passage on any chance the new EGR design is still not good enough, replaced all the other bad stuff with new/better, and cutout the catalytic converter from ever causing a bottleneck ever again.

Sheesh! My engine seems so very happy to be alive. I've NEVER felt it so strong! I can do burnouts too easily now, which I never could before.