LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

new plug wires = low RPM stumble

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Old Oct 2, 2007 | 07:12 PM
  #1  
JoeliusZ28's Avatar
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Question new plug wires = low RPM stumble

Ok i recently installed a taylor OTVC wire kit, and im on gremlin number 2.

the issue im having is a stumble from 1-2k rpms, under load (half throttle or more). It is also mostly in first and second gear. the car seems to 'hiccup' and mildly buck the drivetrain. If i hold it under load, it will usually buck continually until it gets out of the lower RPMs. It almost seems like something a car would normally do under heavy throttle at low RPMs, but the thing is... it didnt do it before the new wires were installed.

The car still pulls hard as hell, but its definitely weaker on holeshots. It doesnt want to turn the tires from a slow roll like it used to. The way it is right now i am 99% sure it would sputter on me coming off the line at the drag strip.

it doesnt seem like a plug wire issue but it kind of has to be... so im looking for advice on what to do next. Some people have told me i should stick to factory wires, so im debating trying that.
Old Oct 2, 2007 | 07:29 PM
  #2  
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From: Jackstandican
Check your plug wires and your plugs. If it wasn't doing that before you changed the wires out it's a good indication the wires and/or plugs are the culprit.
Old Oct 2, 2007 | 07:33 PM
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Agreed - check the wires again. Make sure you have a positive click on the plugs and the opti.
Old Oct 2, 2007 | 07:39 PM
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Originally Posted by DarkHorse
Agreed - check the wires again. Make sure you have a positive click on the plugs and the opti.
getting a 'positive click' on the opti was more than a challenge on every last one of them. They are all on the opti though snug with 1/4" or less room remaining on every one.
Old Oct 2, 2007 | 07:41 PM
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Originally Posted by JoeliusZ28
getting a 'positive click' on the opti was more than a challenge on every last one of them. They are all on the opti though snug with 1/4" or less room remaining on every one.
How about the plugs-to-wires? You should also check to make sure the plugs are in good conidtion (ie porcelain is not cracked).
Old Oct 2, 2007 | 07:42 PM
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I remember them being tough - just check them for your own benefit. I also remember not really hearing a click but more feeling it click, if that makes sense.
Old Oct 2, 2007 | 07:46 PM
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JoeliusZ28's Avatar
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Originally Posted by SS RRR
How about the plugs-to-wires? You should also check to make sure the plugs are in good conidtion (ie porcelain is not cracked).
im beginning to wonder if thats the problem. i heard a plug make a crack sound on me but i couldnt see or feel any cracks on it. whats worse is i cant remember what plug that was.
Old Oct 2, 2007 | 07:49 PM
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Originally Posted by SS RRR
How about the plugs-to-wires? You should also check to make sure the plugs are in good conidtion (ie porcelain is not cracked).
Good call.

I had this happen to me - little too much on the ratchet when tightening and cracked one myself. Luckily, I pulled it out immediately and replaced.
Old Oct 2, 2007 | 09:09 PM
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Did you terminate the plugs yourself? Might have snapped a core lead or bent it too far, and it only fires when it's got more voltage to jump to the rest of the lead.
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