Name that problem
So go get a scan to see what the 02 sensors are doing while the engine is running.
A dirty MAF will effect cold start-up and WOT only. But clean it anyway.
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12 Second Club
Joined: Nov 2005
Posts: 407
Likes: 1
From: Rockwall, TX
Depending on what it costs you to get a scan, you can buy something like: www.obdcom.com to check your O2 sensors. When the front sensors are working as they should they will rapidly switch from high to low voltage but the average should be somewhere near the middle. Your o2 sims should read a constant 0.45v or right around there.
You can buy specific MAF cleaner in an aerosol can. Use that. Do not touch the tiny sensors that are exposed inside the MAF. They are delecate.
You can buy specific MAF cleaner in an aerosol can. Use that. Do not touch the tiny sensors that are exposed inside the MAF. They are delecate.
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 63
Likes: 0
Well, we replaced the crank sensor and that didn't work. My buddy is going to bring a real scanner over this weekend. We drove down the road and now it is misfiring bad and constantly. We are going to check plugs/wires and coil packs this weekend.
Make sure the harnesses on the injectors are completely seated. All of them should "snap" into place. One of mine was barely unplugged and I could barely drive my car home it was misfiring so bad. Just a thought.
But the culprit was the ground wire that goes from the PCM and attaches to the engine block. 4 little wires come out of the PCM and merge into one, then that larger wire attaches to the block somewhere.
Start it up and grab the wiring harnesses everywhere and move them around to see if things change from crappy to good. Move the fuel injector harnesses on both sides and move the coil harnesses on both sides.
And remember, one bad fuel injector on a side will take out all 4 injectors, if its an electrical issue with that bad injector.
Best way to find the misfiring cylinder......
When the engine is cold, start it up for 15 seconds, then feel each exhaust pipe near the heads. The cold one(s) are misfiring...or not firing. You can also hold a screwdriver on each exhaust pipe and you should be able to feel the "tick" when it misfires.
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If I remember correctly it was for some emissions BS, no worries mine has the same wire hanging LOL.
BUt I have just today started having the same DAMN problem! I have aeroforce guages and they dont detect misfires, SES lights, Knock is 0 I pull all the plugs and the #5 looks like this, all full of SOOT!
So I think I have a leaky injector or a coil going BAD, my brother has a 06 tahoe and Im gonna stop by tomorrow and take one of his and replace it with the one in cyl #5 and see if mine still does the SAME EXACT DAMN thing you have
If you like can I keep you posted? I dont wanna be a highjacker but they are the same problems and symptoms!
BUt I have just today started having the same DAMN problem! I have aeroforce guages and they dont detect misfires, SES lights, Knock is 0 I pull all the plugs and the #5 looks like this, all full of SOOT!
So I think I have a leaky injector or a coil going BAD, my brother has a 06 tahoe and Im gonna stop by tomorrow and take one of his and replace it with the one in cyl #5 and see if mine still does the SAME EXACT DAMN thing you have
If you like can I keep you posted? I dont wanna be a highjacker but they are the same problems and symptoms! LS1 Tech Stories
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Staging Lane
Joined: Nov 2005
Posts: 63
Likes: 0
Everything is running smooth (crossing fingers) after changing my plugs and wires. Some of the plugs looked very bad with a nice build up on them. I put the msd wires in this time instead of a cheap set like last go around. Thanks for all the help!!!!
Lol, man we must be on the same work schdule. I was typing to tell you I changed the coils and I STILL have the problem! I'm gonna change wires next, even though I just bought these MSD's in October.
