Thread: Car runs great but...

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  1. #1 Car runs great but... 
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    CEL won't seem to go off even after fixing the TPS. Today I went and got it scanned and it came up with P0121 and P0420 on the symptoms it said that a large vacuum leak can be the cause, anyone know a good place to start, which vacuums are prone to go bad? Also would like to add I don't think the cat is going out because it doesn't give off the "rotten egg" odor at all.
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  2. #2 Re: Car runs great but... 
    Moderator dsmuts's Avatar
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    hit the cat and see if it makes a rattling noise. If it does it's bad.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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