...Still running like crap
Thread Starter
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Joined: Jun 2005
Posts: 57
Likes: 0
From: Siloam Springs Arkansas
...Still running like crap
I posted my original problem here. I thought it was running pretty good until I drove the car to work. It's backfiring and missing in high gears at lower RPMs (ie. 6th gear at about 45-50 MPH) It also started idiling a little rough.
I'm pretty dang sure the wires are on right, because I was very careful to listen for the clicks when I put them on. I also put a decent amount of dielectric grease on them. I was also very careful when putting the plugs (GMPP Iridium plugs gapped at .4) in to make sure I didn't crack the ceramic.
Is it possible that the computer has the timing messed up? I reset all the codes (which included a misfire code), but that didn't seem to help.
Another thing I wondered was if having a cracked plug and wire in engine possible messed up one of the coil packs. I don't even know if that is possible though. Any thoughts guys?
I'm pretty dang sure the wires are on right, because I was very careful to listen for the clicks when I put them on. I also put a decent amount of dielectric grease on them. I was also very careful when putting the plugs (GMPP Iridium plugs gapped at .4) in to make sure I didn't crack the ceramic.
Is it possible that the computer has the timing messed up? I reset all the codes (which included a misfire code), but that didn't seem to help.
Another thing I wondered was if having a cracked plug and wire in engine possible messed up one of the coil packs. I don't even know if that is possible though. Any thoughts guys?
Team Owner
Joined: Sep 2007
Posts: 21,915
Likes: 61
From: Miami Beach FL
When I changed mine I didn't use grease on the plugs or wire boots, just some anti-seize on the plug threads. That may be causing the issue with the boot popping off of the plug; since you got back have you checked to make sure they're completly on?
That's all I can think of, I'm sure others will chime in as well.
That's all I can think of, I'm sure others will chime in as well.
Racer
Joined: Apr 2002
Posts: 274
Likes: 0
From: tarentum pa
if you gapped those plugs, they are junk. but a new set. the plugs come pre gapped for the reason that if you try to set the gap you remove the electroplating on the ground arm. it is also recomended to NOT to use anti seize on the plug threads due to making the plug not ground correctly. only a thin coat of oil is the proper procedure on the threads.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
if you gapped those plugs, they are junk. but a new set. the plugs come pre gapped for the reason that if you try to set the gap you remove the electroplating on the ground arm. it is also recomended to NOT to use anti seize on the plug threads due to making the plug not ground correctly. only a thin coat of oil is the proper procedure on the threads.
Where did you pick up this bit of "information" not to use anti-seize ?????
Racer
Joined: Apr 2002
Posts: 274
Likes: 0
From: tarentum pa
You will never ever see a GM service manual suggest antiseize, ever. it will changed your plug torque values and will sometimes, inhibit ground of the spark plug. 1 drop of synthetic engine oil and torque to 20 ft lbs. Thats it.
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Thread Starter
Advanced
Joined: Jun 2005
Posts: 57
Likes: 0
From: Siloam Springs Arkansas
I've changed plugs on many cars and never used anti seize (I've never had a problem getting plugs out before so I never thought it was necessary). I do typically use die-electric grease on the connections though, which is probably why my plug wire popped off.