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Still running sluggish

Tiny
SARAH142
  • MEMBER
  • 1998 PONTIAC GRAND AM
  • 180 MILES
I have a 1998 grand am gt 2.4. The motor blew so I replaced it. I have also replace spark plugs, wires, coil packs and it is still running sluggish. It doesn't seem to want to go. Any ideas on what will help? The first time I replaced the coil packs it ran great and it was used. After a few days it went back to running rough. I have now bought brand new coil packs and its a little better but it dont wanna go.
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Thursday, May 3rd, 2012 AT 3:34 AM

11 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
CEL on? Get codes read
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Thursday, May 3rd, 2012 AT 4:10 AM
Tiny
SARAH142
  • MEMBER
  • 6 POSTS
There is no check engine light.
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Thursday, May 3rd, 2012 AT 4:15 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Does it come on when you turn key on and go off after starting?
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Thursday, May 3rd, 2012 AT 7:03 AM
Tiny
SARAH142
  • MEMBER
  • 6 POSTS
No I tore the dash apart to replace the bulb and it seems that at some point someone saudered the bulbs to the board. Icould not remove the bulb. Guessing im gunna have to replace the whole board to get the CEL light to work.
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Friday, May 4th, 2012 AT 8:00 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I would try changing the white coil housing. It's very common for them to cause misfire on that engine.
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Friday, May 4th, 2012 AT 9:55 AM
Tiny
SARAH142
  • MEMBER
  • 6 POSTS
Ok guys I got scanned and it says misfire on 1 and 4. Also changed crankshaft position sensor and bad fuel injector. And it still runs horrible. I also changed the coil housing so many times I've lost count. I need help. :)
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Friday, May 4th, 2012 AT 9:29 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Your question stated that you changed the coils, not the coil housing.
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Friday, May 4th, 2012 AT 9:47 PM
Tiny
SARAH142
  • MEMBER
  • 6 POSTS
Well I've tried everthing I've been advised to do and still nothing.
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Friday, May 4th, 2012 AT 11:11 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If you have a misfire it can only be spark, fuel or compression. You can rig up spark testers to verify spark, take a compression test and do an injector balance test.
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Friday, May 4th, 2012 AT 11:21 PM
Tiny
SARAH142
  • MEMBER
  • 6 POSTS
Does it mean anything that the 1 and 4 cylinders are misfiring consistently? They had the exact same amount of misfires shown on the scanner.
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Friday, May 4th, 2012 AT 11:30 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Yes it does because those 2 cylinders are controlled by the same coil so you can probably assume it is a spark problem. If it's not the coil, that leaves the ignition control module or related wiring.
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Friday, May 4th, 2012 AT 11:46 PM

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