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misfiring

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Old Jun 18, 2003 | 03:38 PM
  #1  
matt_82transam's Avatar
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From: Winnipeg, Manitoba, Canada
Car: 82 T/A
Engine: 350
Transmission: th350 w/ high stall C.
misfiring

I recently put headers on my trans am and had to route the plug wires so they wouldn't get fried. I had a basic setup and then I always smelt a burning since I put the coated headers on 4 weeks ago. So yesterday I took duct tape and taped the 4 right side plug wires together so they would be out of the headers way. Since yesterday, under heavier throttle my car misfires alot.
Could it be because the wires so close together are inducing current at such high speeds to the wrong wires?

*I dont think the oxygen sensor can make it misfire but mine is new, however it was close to being totally fried the first day I was driving with headers.

Last edited by matt_82transam; Jun 18, 2003 at 03:54 PM.
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Old Jun 19, 2003 | 12:47 AM
  #2  
25THRSS's Avatar
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From: Glen Allen, VA
Did you replace the burnt wire? If not, thats your problem. Could it possible that while reinstalling the wires you crossed a couple up?
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Old Jun 20, 2003 | 12:00 AM
  #3  
matt_82transam's Avatar
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From: Winnipeg, Manitoba, Canada
Car: 82 T/A
Engine: 350
Transmission: th350 w/ high stall C.
I took the duct tape off of the 4 plug wires and it doesn't hesitate anymore. However today i installed an open element filter system and it has like no low end but lots of top, is this normal?
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Old Jun 20, 2003 | 12:58 PM
  #4  
1MEAN92RS's Avatar
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From: Blacksburg, VA
Car: '92 Rally Sport
Engine: LO3
Transmission: 700R4
Re: misfiring

Originally posted by matt_82transam
So yesterday I took duct tape and taped the 4 right side plug wires together so they would be out of the headers way. Since yesterday, under heavier throttle my car misfires alot.
You need to keep plug wires apart as much as possible. If they happen to get even the least bit toasty on the headers it damages the insulation and being that close they will arc back and forth causing misfire. Get some wire looms.

Later,
Harry
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Old Jun 20, 2003 | 02:31 PM
  #5  
matt_82transam's Avatar
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From: Winnipeg, Manitoba, Canada
Car: 82 T/A
Engine: 350
Transmission: th350 w/ high stall C.
does the same go for the boot, because I tried everything but my #5 boot is about 1/4 of a centimeter away from header.
I also changed the plugs today and noticed that half of them were severely cracked.
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Old Jun 20, 2003 | 04:36 PM
  #6  
1MEAN92RS's Avatar
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From: Blacksburg, VA
Car: '92 Rally Sport
Engine: LO3
Transmission: 700R4
Originally posted by matt_82transam
does the same go for the boot, because I tried everything but my #5 boot is about 1/4 of a centimeter away from header.
I also changed the plugs today and noticed that half of them were severely cracked.
The plug boots aren't as bad about it, esp. if you use a good dab of dielectric grease on every one. The ceramic insulator on the plugs being cracked is BAD! When they crack you can open the hood at night (take the hood light out) and see a "halo" effect around the plugs where the fire is jumping to the block. There's also a neat little tool you can get from about any parts store that looks like a ball point pen to help you diagnose any arcs or misfires. Check it out, they work pretty good and only cost a couple bucks. If you still think your plug boots are too close to the headers then you can always order some Accell shorty plugs for headers. Here's a good picture of what my wire looms did for me.
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Old Jun 23, 2003 | 10:24 PM
  #7  
matt_82transam's Avatar
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From: Winnipeg, Manitoba, Canada
Car: 82 T/A
Engine: 350
Transmission: th350 w/ high stall C.
slick looms, about how much did they cost, how many did u use?
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Old Jun 27, 2003 | 01:12 PM
  #8  
1MEAN92RS's Avatar
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From: Blacksburg, VA
Car: '92 Rally Sport
Engine: LO3
Transmission: 700R4
Originally posted by matt_82transam
slick looms, about how much did they cost, how many did u use?
They were the Made for You centerbolt looms - $44 from Summit and it come with 8 pieces. Six of them screw down onto the top of your valve covers with the longer bolts they provide and two of them mount between the valve cover and the dissy to keep those wires apart.
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Old Jun 27, 2003 | 01:16 PM
  #9  
icebird_1981's Avatar
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From: Toronto
u r not suppost to have wire crossing
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