Violent backfire at WOT, stumbling
02-13-2012, 07:53 PM
#1
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Violent backfire at WOT, stumbling My 98 c5 violently backfires if you go WOT, sounds like a bomb going off (no kidding its scary loud) and the car stumbles like crazy. Only does it at WOT, its fine cruising around and what not.
What do you guys think it can be? Anyone had similar situations? And no its no just "backfire" i mean its so loud sounds like a gun going off!
Appreciate the help
What do you guys think it can be? Anyone had similar situations? And no its no just "backfire" i mean its so loud sounds like a gun going off!
Appreciate the help
02-14-2012, 09:43 AM
#4
When was the last time you swapped plugs? How about the wires? You'd be surprised how often it's just the spark plugs or wires.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
02-14-2012, 10:11 AM
#5
I think a backfire is usually unburned fuel in the exhaust pipes lighting off? Could be a number of things, but if you have unburned fuel in the pipes, there is a good chance your CAT(s) is going to be trashed along with your O2 sensor(s). I would look at everything mentioned above and also look at the CATs and O2s because they may be ruined.
