missfire on #2 and #7
07-22-2009, 02:09 PM
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missfire on #2 and #7 OK, I'm logging this thing with HP tuners, and it's showing massive amounts of missfires on #2 and #7.
car runs like crap, and has an obvious miss. the check engine light is flashing (missfire).
Here is what I've done--- swapped plug, wire, and coil from #2 to #4 and the missfire stays at #2. So I'd say that those three items are OK (plugs looked about the same BTW). Before I plull the fuel rail and swap injectors, I'd like to see what you guys think.
Thanks in advance for your help.
car runs like crap, and has an obvious miss. the check engine light is flashing (missfire).
Here is what I've done--- swapped plug, wire, and coil from #2 to #4 and the missfire stays at #2. So I'd say that those three items are OK (plugs looked about the same BTW). Before I plull the fuel rail and swap injectors, I'd like to see what you guys think.
Thanks in advance for your help.
07-23-2009, 12:15 PM
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Its 4 and 7 are on the same circuit. I just went through this bullshit on a 06 GTO i had in my shop two weeks ago!
Check valvetrain, do a leak down/compression test. and check your cylinder misfires again.
Check valvetrain, do a leak down/compression test. and check your cylinder misfires again.
07-30-2009, 10:15 PM
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Here is what I've found....
I moved the #2 and 7 injectors to #1 and 3. I lowered the missfire detection temp to 100. within 30 seconds of reaching temp, it picked up more than 40 missfires on #1 and 3. But it still picked up 5 on #7.
I guess new injectors are in order, but does anyone have any ideas about the 5 missfires still on the #7?
I moved the #2 and 7 injectors to #1 and 3. I lowered the missfire detection temp to 100. within 30 seconds of reaching temp, it picked up more than 40 missfires on #1 and 3. But it still picked up 5 on #7.
I guess new injectors are in order, but does anyone have any ideas about the 5 missfires still on the #7?
07-31-2009, 08:29 AM
#5
I'm having the same problems on my #4 cylinder, but while dealing with this issue I'm seeing that other cylinders also get misfire counts every now and then (but nowhere near the amount I'm getting on #4).
Some misfires here and there are ok and happen normally, so even though #7 is a good cylinder now, it still will get some misfires. But if the heavy misfires moved with the injectors to 1 and 3, then that's what your problem is.
Some misfires here and there are ok and happen normally, so even though #7 is a good cylinder now, it still will get some misfires. But if the heavy misfires moved with the injectors to 1 and 3, then that's what your problem is.
08-28-2009, 02:34 PM
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OK, I'm Lost.
I bought a complete new set of injectors. once installed the missfires were still on #1 and 3. after driving (easily) for 10 min, the missfires moved to #1 and 7, then 10 min later they were back at #1 and 3, then back to 1 and 7 and finally #2 and 7 where they stayed. which by the way, is right where I started!
I bought a complete new set of injectors. once installed the missfires were still on #1 and 3. after driving (easily) for 10 min, the missfires moved to #1 and 7, then 10 min later they were back at #1 and 3, then back to 1 and 7 and finally #2 and 7 where they stayed. which by the way, is right where I started!
