Modular 4.6L Tech For all your 1996-2005+ 2V, 3V, and 4V modular motor needs.

Miss in engine

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  #1  
Old 06-21-2005 | 06:02 PM
GTmustang04's Avatar
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Stereo Nut
Joined: Feb 2005
Posts: 83
From: Baltimore, MD
Default Miss in engine

it feels like i have a miss in the motor when im running in first gear at a low RPM. any idea what this is?
 
  #2  
Old 06-21-2005 | 09:06 PM
mike sweeney's Avatar
Senior Gear Banger
Joined: Sep 2004
Posts: 230
From: Two Harbors, MN.
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Have you washed your engine recently or did you get water in the engine compartment??? Water down in the spark plug wells can short out the coils. I have been replacing a lot of coil packs at work over the last 3 years, they have a fairly high failure rate. If you have access to a scan tool check the PCM for codes. if you have a code p0301 through p0308 that will tell you which cylinder is misfiring the last digit of the code is the cylinder number. For example a code p0301 is for cyl 1 and a p0304 would be for cyl 4. coils are by far the number 1 cause of misfires on all Modular engines.
 
  #3  
Old 06-21-2005 | 09:29 PM
WaterDR's Avatar
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Joined: Sep 2004
Posts: 6,613
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Hey Mike, could someone have a degraded coil pack such that the car runs fine on brand new plugs, but starts to miss after a few thousand miles? Then, new plugs seems to fix the problem, then the msss comes back again in a few thousand miles?
 
  #4  
Old 06-22-2005 | 07:44 PM
mike sweeney's Avatar
Senior Gear Banger
Joined: Sep 2004
Posts: 230
From: Two Harbors, MN.
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Yes that could be the problem. Does the plug look fouled when it starts to miss? If so the coil could be the problem.
 
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