05 GTP- exhaust leak into cab

[DEEZUZ]

Ive noticed a strong exhaust smell lately. Even if I have the HVAC on recirc, it still gets in cab. With heat off, not so much. Are there any common leaks? I know when I start it up cold it has a loud exhaust tick, but only for about a minute....

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[02BlueGT]

HVAC intake is in the cowl, so underhood leaks can get into the system that way. Even on Recurculate, the GM cars take in some outside air. The flex section at the flange between the rear mani and the cat is a common failure. If you do not want to replace it, you can fill it with copper RTV and let it cure for a few days before driving it(if it is an option for you)

Part all the way to the left on the bottom DP in the picure below:

 

[DEEZUZ]

I take it that shiny to piece is a cat delete? I have emissions here, could I install that delete and install O2 simulators?

 

[02BlueGT]

I take it that shiny to piece is a cat delete? I have emissions here, could I install that delete and install O2 simulators?

Yes, there are several DP's on the market, make sure you get a 04+ version. If you want to test, while the engine is running, move it back and forth and see if you can get the leak sound. You might have to unbolt one or both of the "dog-bone" front engine mounts (two 15mm wrenches IIRC) Many times it breaks in a place that really only leaks when the car is in either reverse or a forward gear. (Motor movement)

I'd suggest wbodystore.com if you go the DP route to support a TCG sponsor and member

And you can do a 02 sim or a tuned PCM with the code deleted. Many members here have DHP and can remove the code for a smallish fee.

 

[DEEZUZ]

oh ok. I'll toss it on the lift at work and see if I can see the leak. I also have a boost leak kit at work, I'll see if I cant hook it up. thanks!

 

[02BlueGT]

oh ok. I'll toss it on the lift at work and see if I can see the leak. I also have a boost leak kit at work, I'll see if I cant hook it up. thanks!

Probably be easier to see from the top, nothing over it, but under it you have the steering rack and a frame member. You can't really look straight up at it. Once you get in there I'm sure you'll figure it out though. There might be a factory heat shield on it, I'm unsure with the 04+ ones.

 

[Turbocharged400sbc]

someone might have pulled the rubber weatherstripping along the cowl thats supposed to keep engine bay air from entering the cabin.

daves spot on about the oem flex pipe splitting

 

[AjL227]

I don't believe there are any '04+ o2 emulators.
It is still possible to pass without one.

 

[DEEZUZ]

Ok so one exhaust manifold bolt broken in the front. Exhaust pouring out of there... common?

 

[serb82]

Gm junk. If it was a diesel you would love the smell !

 

[wolfe]

push into a lake

 

[Turbocharged400sbc]

ive seen it but its not too common

the one ive seen snap is the lower left near the lower radiator hose

which of yours is missing? both the outter one's are studs the inner 4 are studed head bolts

 

[DEEZUZ]

One closest to beltdrive in front

 

[IZZy]

dont get high on those fumes CTC

 

[Turbocharged400sbc]

One closest to beltdrive in front

yup thats the one

honestly if it is broke off its not hard to drill it out but often times it works to just take the manifold off and copper rtv that end/between the MLS exhaust gasket layers then reinstall it with the left side snug and let it sit overnight then give em a little tweak and finish it up

you can leave the crosover in place and just remove the heat shields, you dont need to put em back on either

 

[DEEZUZ]

So what your saying is park it til spring time and drive the Powerstroke..... done....

 

[SleeperLS]

 

[slowchevy]

y u no just buy cheap headers and cheap catback for that race car.

 

[DEEZUZ]

Cause unlike you im not sinking stupid money into junk gm w body cars....