Strange Problem I can't solve, Misfire and loss of power.
04-12-2008, 02:02 PM
#11
5th Gear Member
Join Date: May 2007
Location: N/A
Posts: 2,690
RE: Strange Problem I can't solve, Misfire and loss of power.
That 1st plug does look odd. Change plugs and perhaps have it dyno tuned if the problem persists. Sounds like you have a dead cylinder.
Could be a tune issue....maybe nothing more then time to change the plugs.
Your running race gas, are you F/I or spraying?
Could be a tune issue....maybe nothing more then time to change the plugs.
Your running race gas, are you F/I or spraying?
04-18-2008, 03:33 PM
#12
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
RE: Strange Problem I can't solve, Misfire and loss of power.
ORIGINAL: 2k05gt
I hit MIR a few weeks back for the first time this year, and my last run of the day I went past the trap and let off the gas and a huge puff of white smoke came from the exhaust. Now I hear a misfire while at idle or on cruise control at low RPM, it happens every 2-5 seconds and at idle like waiting at a stop light I can feel the car shake, you can hear the tone of the engine drop when that happens. At WOT you can here a constant misfire sounds like popping.
I went to a local 1/8 mile track a week later with no issues other than it misfiring.
. What could this be? could it be a serious problem?
I thought Plugs but I pulled them and they look fine, I cleaned the TB and MAF sensor, nothing helps.
here are the plugs, they look good 46,893 miles
I did use 2 Gal of 104 with 1/2 tank 93 oct.that was over 3 months old (the car sat over the winter while I installed headers and polished the Valve covers)
I also reloaded the tune just to see if that would fix it, but nothing...
Any Ideas, other things I can try?
I hit MIR a few weeks back for the first time this year, and my last run of the day I went past the trap and let off the gas and a huge puff of white smoke came from the exhaust. Now I hear a misfire while at idle or on cruise control at low RPM, it happens every 2-5 seconds and at idle like waiting at a stop light I can feel the car shake, you can hear the tone of the engine drop when that happens. At WOT you can here a constant misfire sounds like popping.
I went to a local 1/8 mile track a week later with no issues other than it misfiring.
. What could this be? could it be a serious problem?
I thought Plugs but I pulled them and they look fine, I cleaned the TB and MAF sensor, nothing helps.
here are the plugs, they look good 46,893 miles
I did use 2 Gal of 104 with 1/2 tank 93 oct.that was over 3 months old (the car sat over the winter while I installed headers and polished the Valve covers)
I also reloaded the tune just to see if that would fix it, but nothing...
Any Ideas, other things I can try?
Check the boot of the COP you pulled off of it. It will probably have some white powder on the boot. The white powder indicates arcing.
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