2000 Pontiac Ignition Problem - Engine Troubleshooting


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2000 Pontiac Ignition Problem

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

cpharr
New User

Nov 18, 2008, 5:12 PM

Post #1 of 3 (3878 views)

2000 Pontiac Ignition Problem	Sign In

I have a 2000 Pontiac Bonneville, 3.8, 118k miles and it is not firing on 1&4. I can pull the wires from the ignition coil to verify this, so I replace the coil and still have no spark from this coil. What else can cause this, maybe the Ignition Control Module? If so, where is it located at and how can I verify that this is what I need without buying one first?

Thanks in advance for any help.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Nov 18, 2008, 5:48 PM

Post #2 of 3 (3872 views)

Re: 2000 Pontiac Ignition Problem	Sign In

My first instinct would be the control module, BUT, have you pulled codes yet? Could be a (PCM) driver problem.
(The control module is what the coils are mounted on).
Loren
SW Washington

autojoe
User

Nov 19, 2008, 4:32 PM

Post #3 of 3 (3860 views)

Re: 2000 Pontiac Ignition Problem	Sign In

Install a spark tester at the spark plug end of the ignition wire associated with the misfiring cylinders hooked to good ground.
Jumper the spark plug end of the companion cylinder ignition wire to engine ground. The companion cylinder is the cylinder that shares the same ignition coil (i.e. 1/4, 2/5, 3/6).
Crank the engine while observing the spark tester.
Then reverse and see if spark on both 1/4.
Measure the resistance of the ignition wires associated with the cylinders that were indicated as misfiring. (1000-1500 ohms per foot)If not in spec. replace wires.

disconnect the ignition coil for cylinders 1/4.

Connect a test lamp across the ignition module primary circuit terminals.

Remove the fuel injector fuse.

Observe the test lamp while cranking the engine.

Does the test lamp blink?
If not,replace Ignition control unit.All connections tight where coil sits on module terminals and also electrical connections.?Secondary resistance of coil should be between 5-8,000 ohms.
They do make dis ignition module testers but pretty expensive.I don't know if any local parts stores have them.Could call and see.ICM easy to replace,just remove coils and then remove ICM.I usually check coil if having a problem with one is switch coil and see if problem follows coil.Just some thoughts.

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