please help me find my spark problem

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Apr 9, 2014 | 10:18 PM

nojoke327

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From: monroe ct

please help me find my spark problem

So I recently got a 99 expi and it had a miss. I figured it was a coil pack so I got 2 new(used) coils and replaced the 2 in the truck. Well nothing changed. I swapped coils again and nothing. I started taking plug wires off to see if I could see the spark jumping. Well I found the driver coil firing cylinders 2 and 8 won't fire. The wire controlling that coil looks ok and isn't visibly damaged.

Does anyone have an idea where to go from here? Could the computer be bad? Does anyone have a wire diagram from the computer to the coil so I can make another wire to test with.

Apr 9, 2014 | 10:33 PM

alloro

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From: 0,0,1

Quote:

Originally Posted by nojoke327

Does anyone have a wire diagram from the computer to the coil so I can make another wire to test with.

See the attached PDF.

Attached Images

Coils 4-6 Engine.pdf (52.7 KB, 117 views)

Apr 9, 2014 | 10:53 PM

nojoke327

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From: monroe ct

Quote:

Originally Posted by alloro

See the attached PDF.

Thanks for the file. That is a good start to tracing the wires and connectors for possible corrosion or breaks

Apr 10, 2014 | 07:48 AM

aircargoo

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Joined: Oct 2008

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must be hard to reach pass side rear 2 plugs....i never tried myself. you do them yourself???? im sending mine out this minute for plugs and lower ball joint.....

Apr 10, 2014 | 08:41 AM

nojoke327

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From: monroe ct

They do look difficult to do but I haven't gotten that far yet. I planned to do them soon but I want to figure out why the driver side coil isn't working first.