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What could be making my Tahoe have a misfire

Tiny
SHAKEYJAKE
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 113,000 MILES
I replaced the plugs and wires disributer cap and roter. The ignition coil has been replaced but was not mounted for a little bit whenever I messed with the plugs on it, it ran better for a little when I turn it off and start again it misses again.
Monday, July 9th, 2012 AT 11:37 PM

22 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So does it miss at idle or driving etc?What codes if any do you have?
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Monday, July 9th, 2012 AT 11:43 PM
Tiny
SHAKEYJAKE
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  • 12 POSTS
It does it driving and at a stop light when in park the rpm goes a little over 500 rpm then below 500 and lopes between them. It threw two codes p1345 and p1345 pending
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Monday, July 9th, 2012 AT 11:51 PM
Tiny
SATURNTECH9
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Did you have the code before replacing everything?
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Monday, July 9th, 2012 AT 11:58 PM
Tiny
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I had it before I replaced the ignition coil
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Tuesday, July 10th, 2012 AT 12:00 AM
Tiny
SATURNTECH9
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I would be following the trouble tree for that code do you have the trouble tree for that code?
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Tuesday, July 10th, 2012 AT 12:25 AM
Tiny
SHAKEYJAKE
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No I don't. What is a trouble tree, sorry not to smart on this stuff so I will probably ask a lot of questions like that
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Tuesday, July 10th, 2012 AT 12:28 AM
Tiny
SHAKEYJAKE
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  • 12 POSTS
Oh I took it to a shop for the test and they say my disributer is probably sticking
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Tuesday, July 10th, 2012 AT 12:30 AM
Tiny
SATURNTECH9
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A toruble tree is a flow chart used to diagnose and repair of trouble codes or other issues cars and trucks have. For yours that trouble tree requires a advanced expensive scan tool to follow the trouble tree.I posted a diagnostic for your code that might help. Distrubutor sticking?Iam not following what there talking about.
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Tuesday, July 10th, 2012 AT 12:42 AM
Tiny
SHAKEYJAKE
  • MEMBER
  • 12 POSTS
I did not follow either they said it could be sticking and it is not hitting the points like it should, it kinda sounded like a scam so I did not let them do it. So by that chart seeing it gets better when I mess with the plugs, could I have a loose or busted ground?
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Tuesday, July 10th, 2012 AT 12:53 AM
Tiny
SATURNTECH9
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On the trouble tree I see cap rotor distrubtor miss installed distrubutor loose etc. Also loose cam sensor bad crank shaft sensor loose wires to the distrubutor. Nothing about spark plugs for that code.
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Tuesday, July 10th, 2012 AT 1:30 AM
Tiny
SHAKEYJAKE
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Sorry I did not specify I thought the worn wires would include the plug for the coil, the one that powers it not the lead to operate the disributer
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Tuesday, July 10th, 2012 AT 1:59 AM
Tiny
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So if you move the coil feed wires around it changes the way it runs?
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Tuesday, July 10th, 2012 AT 3:24 AM
Tiny
SHAKEYJAKE
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  • 12 POSTS
Yes normally it will
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Tuesday, July 10th, 2012 AT 10:42 AM
Tiny
SATURNTECH9
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Are the wires your moving close to the coils connector?
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Tuesday, July 10th, 2012 AT 5:29 PM
Tiny
SHAKEYJAKE
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  • 12 POSTS
Yes I unplug it and plug it in couple times
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Tuesday, July 10th, 2012 AT 6:00 PM
Tiny
SATURNTECH9
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You said the coil isnt mounted?If thats true bolt the coil down tight and see how it runs?If you can still play with the plug and change the way it runs replace the connector to the coil.
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Tuesday, July 10th, 2012 AT 8:15 PM
Tiny
SHAKEYJAKE
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I recently mounted it so I will try that do I just splice a new plug on or run a whole new wire
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Tuesday, July 10th, 2012 AT 8:45 PM
Tiny
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Iam sure you can get the connector with leads I would replace the connector with leads thats your best bet Look at www. Rockauto. Com you can get the part number and probably find that part number on amazon cheaper.
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Tuesday, July 10th, 2012 AT 9:22 PM
Tiny
SHAKEYJAKE
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Ok thank you hope this works
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Tuesday, July 10th, 2012 AT 9:57 PM
Tiny
SATURNTECH9
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You have to start with the problems that you can find like that one and go from there.
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Tuesday, July 10th, 2012 AT 10:05 PM

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