plug #7 getting wet with gas
05-29-2009, 05:01 PM
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plug #7 getting wet with gas Alright so my car passed the leakdown test so i know my internals are good. So now my problem is either fueling or ignition related. Plug 7 is getting wet with gasoline. Spark is good and the wire is good. Could it be that all i have to do is lean out cylinder 7 or could something else be causing the problem?
my injectors have been flow tested, matched, and cleaned recently. all are in working order.
my injectors have been flow tested, matched, and cleaned recently. all are in working order.
05-30-2009, 12:16 PM
#2
Is it throwing any codes? Does it feel like it's only running on 7. I would say a faulty injector, maybe try swapping a different injector to that cylinder. Or possibly you have weak spark thats blowin out from the compression of the motor. When you checked for spark, was the color a bright blue or pink? If pinkish color, then you have an ignition issue. But normally all cylinders atleast on one bank would show the same symptoms.
05-30-2009, 03:54 PM
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ive swapped injectors around but still have the same problem. the spark is real strong blue/white in color. car isn't throwing any codes. its running only on 7 because when i take the injector harness off of 7 nothing happens. injector harness has been tested as well and it is fully functional.
according to my datamaster log during wide open throttle my left long term trim reads 156 while my short term is at 128.
according to my datamaster log during wide open throttle my left long term trim reads 156 while my short term is at 128.
05-31-2009, 10:13 AM
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we did swap injectors around. we put an injector from a cylinder whose plug wasn't getting wet on #7 and the plug still got wet so i thought i could rule out injector failure.
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05-31-2009, 03:26 PM
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the pcm theory is logical but i swapped my stock one out for another stock one with a new tune to see and still the problem was the same.
05-31-2009, 08:23 PM
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Did you try new spark plugs? Maybe that one is faulty.
And to repeat what SD said.. did you actually use a noid light? That will ensure it's really activating the injector. Not just verifying power and ground.
And to repeat what SD said.. did you actually use a noid light? That will ensure it's really activating the injector. Not just verifying power and ground.
06-14-2009, 12:31 PM
#18
Sounds like possible cracked head at cylinder #7
Is it misfiring in that cylinder?
Have you done compression test?
Might have a hair line crack and coolant might be spraying in that cylinder, it happen on my 97 V6 Firebird took me long time to find it.
Is it misfiring in that cylinder?
Have you done compression test?
Might have a hair line crack and coolant might be spraying in that cylinder, it happen on my 97 V6 Firebird took me long time to find it.
Last edited by LT1; 06-14-2009 at 12:41 PM.
06-14-2009, 12:45 PM
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its gas not coolant the plug doesnt appear to be firing at all i have put 3 different plugs in it and they all look the same so i thought the wire wasnt up on the opti all the way so i checked and rechecked that and they are good pulled the injectors and cycled the key to see if they were leaking, no luck there.
06-14-2009, 02:18 PM
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okay got an update. so i decided to look over the logs real carefully and the problem is mostly at idle and dfco (cells 16 and 18). also a little bit in cell 15 not sure what range cell 15 is for but that could probably be fixed by some VE fine tuning anyway.... i said to myself let me try to do the cheapest and easiest thing to see what happens which would be mess with the fuel trim at idle for cylinder 7. i took out 5% of fuel and logged it to my weekly car show. at first it was looking shitty but after a couple of minutes the computer got settled and the problem got better from what I could see while looking at my datalogger at stops. went from Long Term Left Trims in the 150s to a steady 140. all was looking good. i was like **** yeah!
on the drive home i said let me log it again. Long Term Left Trims were now at 152 and I was PISSED! so i get home turn the car off and open up the hood to put on the battery saver. i then notice something is missing. somehow the car blew off plug on the valve cover. i was like WTF how did this happen? anyway i assume that the car blew it off early on the way home and that was causing the lean condition again. going to get a new plug to test it out again.
on the drive home i said let me log it again. Long Term Left Trims were now at 152 and I was PISSED! so i get home turn the car off and open up the hood to put on the battery saver. i then notice something is missing. somehow the car blew off plug on the valve cover. i was like WTF how did this happen? anyway i assume that the car blew it off early on the way home and that was causing the lean condition again. going to get a new plug to test it out again.
