Thread: Random misfire after topswap

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  1. #1 Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    Heres a quick rundown, within the first 100 miles of the topswap i never noticed the code, but checked during a trip and a random misfire had popped up. I set up torque app to read it and it said i was misfiring on 3 and 6, but the highest i saw was 20 times and it would jump around from misfiring to being fine. Well when i got back i switched the coil with a different one and the app said it was fine. Noticed today that it was misfiring again on 3 and 6, so i swapped the icm's. From there sometimes it would be 3 and 6 or 3 and 2. Every once in a while 2 would misfire or the like. Now i never noticed it sounding like it was misfiring, and the car never shook. So right now 3 and 6, and sometimes 3 and 4 are misfiring. Never much though, usually only blips of 2 or 4 for a couple of seconds. Anyone have any thoughts? The plugs seem fine, im only running 604's though. Thought it could be the injectors or plugs for them, but still unsure. Any help is appreciated! On a sidenote, the only SES codes i have other than EGR is a BBV "A" code.
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  2. #2 Re: Random misfire after topswap 
    Moderator dsmuts's Avatar
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    What mods do you have?
    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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  3. #3 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    Basically stock everything from the gtp. Other than that headers, 180 tstat, AL604's, new plug wires from napa. Pretty sure thats all.
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  4. #4 Re: Random misfire after topswap 
    Moderator dsmuts's Avatar
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    Do you mean 104's? Recheck your firing order and look over the plugs and regap them again.
    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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  5. #5 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    I pulled and rechecked the order several times, but i have to put new plugs in tomorrow anyways. I put in one step colder plugs when i should have put in two or three step cooler. As long as im doing that what should i gap them at? I gapped the ones in now at .55.
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  6. #6 Re: Random misfire after topswap 
    Moderator dsmuts's Avatar
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    gap them at .055 one step colder is 605's
    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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  7. #7 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    Then that lol, meant .055
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  8. #8 Re: Random misfire after topswap 
    GXP Level Member Timing's Avatar
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    I wouldnt trust torque app for misfires. I was chasing them for months cause the app said i had some but when i got the car tuned not a single misfire was showing on dhp. And after tune it still shows misfires.
    08 MazdaSpeed 3- Treadstone tr8l, Ebay Piping, Ported intake,Thermal gasket, Cs Injector Seals,Cobb intake/inlet, Autotech Internals, Poly mounts, Speed Daddy DP, Magnaflow CB,
    RPF1 17x9 255/45 Direzza Zll
    04 COMPG- Vs, getrag 284 RIP
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  9. #9 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    I thought that too but I also checked with a snap on modis and still got a couple blips on 3 and 4. I forgot to mention that I havnt had an in car tune done yet. Hust running on a rough tune with gtp trans settings and richened mixtures I believe.
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  10. #10 Re: Random misfire after topswap 
    GTX Level Member dbextreme's Avatar
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    So you are running a stock GTP PCM in your top swap car?
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
    1995 Firebird Formula - Under the Knife
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  11. #11 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    Not quite. GT pcm, with GTP trans settings, and richened up'ed fuel tables. Took the pcm to get loaded with new settings then put it in the car to get some miles on it, then this weekend go get an in car tune.
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  12. #12 Re: Random misfire after topswap 
    Moderator dsmuts's Avatar
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    Why are you using gtp trans settings with a top swap?
    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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  13. #13 Re: Random misfire after topswap 
    GT Level Member WolvesSoulZ's Avatar
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    Hopefully he meant the other way around.
    2000 GT - L67 swapped SOLD | 2004 GT1 - Winter Beater - SOLD
    2004 GTP Comp-G - 3.3"/3.2", XP, #50 , 4" MAF, SD's, 180*, AL103's, HAI, Tuned, 06+ Dual pistons brakes, STB's, SSC's and FE3.
    2011 Audi A6 S-Line - Also Supercharged
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  14. #14 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    Well im stupid and just assumed that's what was needed. Gt settings with raised shift pressure, shift time, and raised shift points.
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  15. #15 Re: Random misfire after topswap 
    Moderator dsmuts's Avatar
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    So you are using the gt trans settings or gtp?
    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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  16. #16 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    I'm not totally sure..Im assuming modified gt settings, but am not totally sure.
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  17. #17 Re: Random misfire after topswap 
    GTX Level Member dbextreme's Avatar
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    LOL Right now, in your case, boost = boom...

    Don't drive the car until this weekend, then slowly drive it to your tuner... A baseline is to use your stock GT PCM and tune from there.
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
    1995 Firebird Formula - Under the Knife
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  18. #18 Re: Random misfire after topswap 
    GT Level Member natethegreat's Avatar
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    It is the stock gt pcm with some changes done to it to make it safe to drive without romping on it. I just drive like a grandpa, don't go into boost and i don't see any KR.
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