misfire - all causes?
09-26-2009, 06:48 PM
#1
Drifting
Thread Starter
misfire - all causes?
Simple question, this misfire is driving me nuts. Car will misfire above 7.5PSI of boost, and only above that.
Plugs are #7 gapped to 0.30
Wires are new
Coils are new
plugs are new
1 - What are the non obvious things that can cause a misfire, does a collapsing turbo inlet tube "act" like a misfire? Do I need to furthermore gap down the plugs?
2 - Are there any other ENGINE related issues that I might be over-seeing?
3 - Can high crankcase pressure cause an engine to misfire? Sounds weird to me, but I overheard someone saying this
Any help recommended. Engine is a forged low-comp (9:1) Warhawk with a turbo cam, and TT kit.
Plugs are #7 gapped to 0.30
Wires are new
Coils are new
plugs are new
1 - What are the non obvious things that can cause a misfire, does a collapsing turbo inlet tube "act" like a misfire? Do I need to furthermore gap down the plugs?
2 - Are there any other ENGINE related issues that I might be over-seeing?
3 - Can high crankcase pressure cause an engine to misfire? Sounds weird to me, but I overheard someone saying this
Any help recommended. Engine is a forged low-comp (9:1) Warhawk with a turbo cam, and TT kit.
09-26-2009, 09:12 PM
#2
Melting Slicks
Member Since: Nov 2005
Location: Houston 06 C6 Ysi SC 402 fgd TX
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Friend of mine traded in his 05 on an 07 and took the mods off the 05 and put them on the 07. He never figured out his misfire on the 07, taking it to the dealer numerous times after taking the mods off. They eventually lemoned it and he moved on to an 08 for about $500.
Thats no help but they tried everything, new computers, firmware, wires, you name it, and he walked away from it into something better.
Thats no help but they tried everything, new computers, firmware, wires, you name it, and he walked away from it into something better.
09-26-2009, 09:54 PM
#4
Drifting
Thread Starter
09-26-2009, 09:55 PM
#5
Drifting
Thread Starter
Friend of mine traded in his 05 on an 07 and took the mods off the 05 and put them on the 07. He never figured out his misfire on the 07, taking it to the dealer numerous times after taking the mods off. They eventually lemoned it and he moved on to an 08 for about $500.
Thats no help but they tried everything, new computers, firmware, wires, you name it, and he walked away from it into something better.
Thats no help but they tried everything, new computers, firmware, wires, you name it, and he walked away from it into something better.
09-26-2009, 10:13 PM
#6
Pro
Member Since: Mar 2006
Location: calgary alberta
Posts: 727
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Go figure? I started at .028 and had ignition breakdown at 5200 rpm. Tried using coil dwell #'s from one of the blower manu. recommendation and it got worse. Everything was checked with no problems discovered. Tried .035 out of desperation and the problem went away wtf!
09-27-2009, 10:21 PM
#7
Former Vendor
Was the car ever tuned or are you still running the base file I sent you? If the car hasn't been tuned and you don't know what your air/fuel ratio is I would start there.
09-27-2009, 10:29 PM
#8
Drifting
Thread Starter
Go figure? I started at .028 and had ignition breakdown at 5200 rpm. Tried using coil dwell #'s from one of the blower manu. recommendation and it got worse. Everything was checked with no problems discovered. Tried .035 out of desperation and the problem went away wtf!
