Thread: 04 GTP caught fire, cat issues and questions

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  1. #1 04 GTP caught fire, cat issues and questions 
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    The day before yesterday after only a 15 minute drive to work, the engine caught fire melting the oil cap and 2 plug wires and would've flamed everything if a co-worker hadn't told me my car was smoking.

    The guy at the shop swung by to have a look and from what we could tell, it was a clogged cat backing up heat to the engine. Hardly any exhaust is making it to the back. Car isn't running great, but it's not too bad. Temp reading shows the cat heating up quick, and cool afterwards

    Sooo, instead of them getting the parts and charging me out the ass, I was going to source my own but i'm not sure what to do. A 3" downpipe and hi-flow cat would be nice. However, what happens if it throws a SES cat code? I don't mind a ghost code but don't want it effecting stuff down the line. Hogans got a nice inexpensive setup but it could still throw a code, or dish out another $100 for one that don't. At that price, just rather get a cheap direct fit.

    Just trying to make the best performance, inexpensive, no hassle decision. You guys have any input?
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  2. #2 Re: 04 GTP caught fire, cat issues and questions 
    Donating Users silverstreak's Avatar
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    Are you sure it's a clogged cat that started this fire? I don't buy that because if your engine got that hot to melt your oil cap then its toast. Your oil would turn to sludge causing failure everywhere.
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  3. #3 Re: 04 GTP caught fire, cat issues and questions 
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    My bad, not really the engine, but the exhaust manifolds being super hot. Two of the plug wires by the front mani were melted, and must've flamed which then started on the oil cap and dipstick. We stopped it before it spread anywhere else....but the fire was singled out to that spot. Luckily I didn't have the engine cover on!
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  4. #4 Re: 04 GTP caught fire, cat issues and questions 
    Donating Users silverstreak's Avatar
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    Wow, that's crazy! Lucky u caught it!
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  5. #5 Re: 04 GTP caught fire, cat issues and questions 
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    Found out that pre 05's have no computer issues regarding the secondary 02 sensor, just trips the check engine light. Yay for having a bastard year for once! Was almost just going to go stock, cause I didn't want the code throwing fuel problems due to a hi-flow cat. Sooo, 3" downpipe and hi-flow cat on the way
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  6. #6 Re: 04 GTP caught fire, cat issues and questions 
    GTX Level Member kjohnson's Avatar
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    have fun and make sure none of your gascuts melted to you dont want another fire because of oil running out of your engine
    silver 2003 Grand Prix GT List is on it's way to be updated

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  7. #7 Re: 04 GTP caught fire, cat issues and questions 
    resident snitch gtpinsc's Avatar
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    valve cover gasket leaking could have caused fire?

    02 GTP with mods 05 GP for DD
    Quote Originally Posted by SuperSport View Post
    The majority of the people here are potheads who want to buy good condition parts at junkyard prices.
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  8. #8 Re: 04 GTP caught fire, cat issues and questions 
    GTX Level Member kjohnson's Avatar
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    naw the 3800 was never known for that
    silver 2003 Grand Prix GT List is on it's way to be updated

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  9. #9 Re: 04 GTP caught fire, cat issues and questions 
    I AM PEWPIN! rynoman03's Avatar
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    Yah it was.... There was a TSB about it.

    FWIW i had a Hogan Catless downpipe and loved it.
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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  10. #10 Re: 04 GTP caught fire, cat issues and questions 
    GTP Level Member tazyboy28's Avatar
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    so were u looking for an aftermarket cat or one from a diff grand prix?
    specs:2007 GP GT, wizair intake, ZZP headers, 3inch high flow cat downpipe. SLP power flo exhaust
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  11. #11 Re: 04 GTP caught fire, cat issues and questions 
    GTX Level Member kjohnson's Avatar
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    Quote Originally Posted by rynoman03 View Post
    Yah it was.... There was a TSB about it.

    FWIW i had a Hogan Catless downpipe and loved it.
    you musta missed my sarcasm... thats cool
    silver 2003 Grand Prix GT List is on it's way to be updated

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  12. #12 Re: 04 GTP caught fire, cat issues and questions 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    Quote Originally Posted by cavGTP View Post
    Found out that pre 05's have no computer issues regarding the secondary 02 sensor, just trips the check engine light. Yay for having a bastard year for once! Was almost just going to go stock, cause I didn't want the code throwing fuel problems due to a hi-flow cat. Sooo, 3" downpipe and hi-flow cat on the way
    Idk where you got that info. but removing the rear 02 sensor on 01+ cars has been known to do a cat diagnostic test at random. The best solution is to get an 02 emulator or recently a tuning program was released to help disable these tests.

    You may want to check your EGR as well if the cat was plugged, sometimes the egr will heat up and fail, causing a lot of gases to go directly into the intake. I've seen an impala with a clogged cat burn a hole through the upper intake near the egr.
    2001 GTP PT61 Turbo, E85, Stock Motor
    2011 Chevy Cruze MT6 1.4L Turbo
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  13. #13 Re: 04 GTP caught fire, cat issues and questions 
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    Thanks for the info guys, i'll check into those. It was the main dude at Hogan performance. He seemed pretty knowledgeable about the 3800 and the computer systems. So the cat test I was afraid of does indeed happen on the older models? I've also read the 02 simulators don't work on the newer models, but was going to try and remove the code with HPTuners later on. Anyways, it's coming in today woohoo, can't wait to get the car back.
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  14. #14 Re: 04 GTP caught fire, cat issues and questions 
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    Quote Originally Posted by cavGTP View Post
    Thanks for the info guys, i'll check into those. It was the main dude at Hogan performance. He seemed pretty knowledgeable about the 3800 and the computer systems. So the cat test I was afraid of does indeed happen on the older models? I've also read the 02 simulators don't work on the newer models, but was going to try and remove the code with HPTuners later on. Anyways, it's coming in today woohoo, can't wait to get the car back.

    i have an 07 stock down pipe if u want to buy it from me at any point in time just incase it can fit ur car.
    specs:2007 GP GT, wizair intake, ZZP headers, 3inch high flow cat downpipe. SLP power flo exhaust
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