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

New plugs and car stumbles

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Old Feb 20, 2009 | 03:52 PM
  #16  
Kevin Blown 95 TA's Avatar
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When you were changing plugs, did you drop any of them?
Old Feb 20, 2009 | 04:01 PM
  #17  
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negative....would it be possible for my car to be running lean with the new plugs? all the new plugs look a little on the lean side

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Old Feb 20, 2009 | 04:44 PM
  #18  
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Are you sure any of the plug wires are not touching anything hot enough to melt them?

I had the same problem and found two of my wires cooked on the manifold!

Good luck bro!
Old Feb 20, 2009 | 04:52 PM
  #19  
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well hopefully in about an hour I'll be heading over to a friends garage that has a pit in it and we'll see if it's the wires.....
Old Feb 20, 2009 | 10:43 PM
  #20  
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well the new wires didn't change a thing...and btw I absolutely hate changing plug wires on this thing.....I will gladly change 3 sets of plugs to 1 set of wires........but now I dont know what to do
Old Feb 21, 2009 | 01:50 AM
  #21  
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Originally Posted by deerslayinrenek
well the new wires didn't change a thing...and btw I absolutely hate changing plug wires on this thing.....I will gladly change 3 sets of plugs to 1 set of wires........but now I dont know what to do
You should have checked them before you replaced them. Now if the car still stumbles i would test the IAC valve and the temp sensor check for vacumm leak's just do a real goo check over of the top of the motor.
Old Feb 21, 2009 | 09:26 AM
  #22  
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how do I test them and will that make the car run like crap
Old Feb 21, 2009 | 05:44 PM
  #23  
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the car is just running too lean...is it possible that the NGk's are just too hot.....and is there anyway to turn up the fuel without sending the pcm away? it had ac delcos before...let me see if I can get a picture on here[IMG][/IMG]

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Old Feb 21, 2009 | 07:01 PM
  #24  
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sorry it's not a very good picture, it was with a camera phone....but this has about 20 miles on it w/ a set of NGK TR55's
Old Feb 21, 2009 | 09:36 PM
  #25  
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Originally Posted by deerslayinrenek
the car is just running too lean...is it possible that the NGk's are just too hot.
I doubt the NGK's are to hot, a lot of people have used them, including me without issue. If this is indeed a fuel issue that just happen to occur when you changed plugs then turning the fuel pressure up is only a temp fix to a real issue. Are all the wires secured on the opti also? I know you more than likely checked already but i'm just making sure.
Old Feb 21, 2009 | 09:55 PM
  #26  
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yea i check all the wires and even put a new set on just to make sure that wasn't an issue, can I turn up the fuel pressure?
Old Feb 21, 2009 | 10:13 PM
  #27  
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Does the car seem like it is missing at all at idle? if it is i would pull one plug wire off 1 by 1 if the missing gets worse put the wire back on and move to the next plug.. if it stays the same you found the dead cylinder. i would then change the plug in that cylinder and go from there.. Hope this helps you some i know how it is to have your camaro down it sucks.. keep us updated
Old Feb 21, 2009 | 11:07 PM
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it doesn't miss at an idle but if your cruising and you try to open it up it'll stumble.....it's like when ya push the throttle, the car isnt getting enough fuel and it breaks up....but if I just slowly keep increasing the rpms it'll be ok....but it still feels kinda doggy
Old Feb 22, 2009 | 12:14 AM
  #29  
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Its not running lean because of the heat range of the plugs. And "turning up the fuel pressure" will not accomplish anything. The O2 sensors will see the extra fuel added by the higher pressure, and the PCM will lower the long term fuel corrections to shorten the pulse width. A hot plug may look cleaner because it reduces the carbon deposits, but it doesn't cause the engine to run any different than it did before.

If it really is running lean (your description does not necessarily support that fact - have you actually measured the A/F ratio?) you need to find out why, not attempt to apply a "band-aid" fix that might cause more problems than it cures.

You are indicating it ran fine BEFORE you changed the plugs. It developed the misfire AFTER you changed them. Something got damaged in the process, or you get a defective plug.
Old Feb 22, 2009 | 04:24 PM
  #30  
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ok so that throws all that out of the window........When i was changing plugs, I think the ratchet hit the knock sensor and it sparked....(yea I know I should always pull the battery terminal but I didn't this time)...what could this have done? and no I didnt check the a/f ratio and I don't want to just put a band-aid on it..........and again if its over about 2700rpm it's ok but if its below it'll stumble pretty bad.....and if i just feather it at low rpms it is also fine.....it just looks to me like its running on the scary side of lean, i was figuring on more of a coco brown....



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