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2003 Buick Century 3.1. multiple misfire, changed 3 coil packs now sparks come from secureing bolts on 5/2 coil.

Also then a loud engine knock developed. Replaced knock sensor. No Change. New wires,plugs. Still misfireing with arcing bolts 5/2 coil.Switched around coils and still arcs 5/2. Cat. Coverter and muffler were replaced and still smell of rich fuel and bad smell. plugs gapped checked and replaced 2x as well as wires just to make sure. Still same problem. I suspect Ignition controll Module.?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

fastboyz
  • 674 Answers

SOURCE: 99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul

Posted on Sep 23, 2008

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

  • 5 Answers

SOURCE: 2003 Chevy Venture misfiring

The injector is a good possibility, although you should check for spark in the wire first, as the electrical is the weakest link in the system. Put a spare plug in the end of the wire with the plug resting on metal, then have someone crank the van to see if you have spark that far, test and replace spark plug, (do not get shocked!) then look into a new injector or a good cleaning.

Posted on Jul 17, 2009

  • 15 Answers

SOURCE: Hesitation and stumbling.

Before you do that, check which thermostat it has in it, if it has one that is letting it get too warm or not completely up to temp when the computer think it should be, it would cause this. My 2000 crown vic did the same thing and thats what it was.

Posted on Jul 20, 2009

  • 257 Answers

SOURCE: 2004 kia optima arcing around the coil pack

the coil pack mybe bad

Posted on Aug 11, 2009

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