1993 Pontiac Grand Am Miss Under Load

1993 PONTIAC GRAND AM
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GREENBAY
  • MEMBER
  • 1 POST
Hi,

My 1993 Pontiac Grand Am, quad 4, distributerless ignition, misses like crazy under load, it doesn't matter what speed or gear. It's better when cold but rapidly gets worse as car warms up. I've replaced the connectors but it made no difference. Could it be the coil pack?
Feb 2, 2006 at 3:42 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
quad fours are known for plug towers and coils. pull it and check for cracks.
Feb 2, 2006 at 4:08 AM
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Suggested Repair

Remove and inspect the coil pack and plug towers for cracks, a common Quad 4 issue that can cause load misfires that worsen as the engine warms.

Conversation Summary

The owner of a 1993 Pontiac Grand Am with a Quad 4 and distributorless ignition reports severe misfires under load at any speed or gear. The problem is milder when cold and worsens as the car warms up; replacing connectors did not help. The expert says Quad 4 engines are known for cracked plug towers and coils and recommends removing and inspecting them for cracks.

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