Help with misfire
03-11-2008, 09:27 AM
#11
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gap is too wide for a FI car, imo.
if the new plugs don't work, it's your tuning.
if the tuning isn't wrong, it's your coils. sometimes taking it out and re-clicking it might kill the problem, but .032 is big for anything boosting over 4psi.
if the new plugs don't work, it's your tuning.
if the tuning isn't wrong, it's your coils. sometimes taking it out and re-clicking it might kill the problem, but .032 is big for anything boosting over 4psi.
03-11-2008, 10:27 AM
#13
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I am hesistant to point the finger at the tuner, he is very well respected and has a buttload of experience. If it weren't so intermittent then I would be going that direction. I'll go check out the AFR when this happens and close the gap up a bit.......
"stay tuned" no pun intended
"stay tuned" no pun intended
03-12-2008, 08:09 AM
#14
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Originally Posted by gotswap,Mar 11 2008, 08:13 AM
So do you think the heat is causing increased resistance and the coils are not able to fire over a .032 gap?
BTW I am only running 9.5 psi gauge but 6.5psi absolute due to the altitude here.
So your probably around 14+9.5 or 13.5+9.5 ABSOLUTE
or.... I didn't sleep enough
-Greg
03-12-2008, 05:26 PM
#15
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ok so here is the scoop
I drove it for about 40 miles pretty hard then parked it for 20.
AIT was at 160ish when I started it and it immediately started misfiring. The AFR went up into the 16's and 17's while it was doing this. I also pulled the plugs and regapped them to .028.
I drove it for about 40 miles pretty hard then parked it for 20.
AIT was at 160ish when I started it and it immediately started misfiring. The AFR went up into the 16's and 17's while it was doing this. I also pulled the plugs and regapped them to .028.
03-12-2008, 05:29 PM
#16
If it drives fine and then starts crapping out, I have a hard time believing its the spark plugs.
Does it always happen at idle or just at idle after driving a while and waiting a little bit?
Does it always happen at idle or just at idle after driving a while and waiting a little bit?
03-12-2008, 06:05 PM
#17
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I thought I would give it a try. It can happen any time when the AIT's go up such as being put away wet after being driven hard then starting it back up a bit later.
In the example above, it starts like normal but revving it up or putting any load on the engine will cause it to dork up. If I let it cool down completely it will be good again until the above happens again.
In the example above, it starts like normal but revving it up or putting any load on the engine will cause it to dork up. If I let it cool down completely it will be good again until the above happens again.
03-12-2008, 06:35 PM
#18
Originally Posted by gotswap,Mar 12 2008, 09:05 PM
I thought I would give it a try. It can happen any time when the AIT's go up such as being put away wet after being driven hard then starting it back up a bit later.
In the example above, it starts like normal but revving it up or putting any load on the engine will cause it to dork up. If I let it cool down completely it will be good again until the above happens again.
In the example above, it starts like normal but revving it up or putting any load on the engine will cause it to dork up. If I let it cool down completely it will be good again until the above happens again.
I'd say have him check out the maps again, give him a ride to show him whats happening so he can tune it out.