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1999 Cadillac Escalade

Tiny
MPEAT1
  • MEMBER
  • 1999 CADILLAC ESCALADE
Engine Performance problem
1999 Cadillac Escalade V8 Four Wheel Drive Automatic

why does my escalade shake and miss fire when I go uphill while towing a trailer and most recently on highway with trailer @ 60 mph. In september I replaced plugs, wires, cap, rotor, and #4 injector. What am I missing I cant figure it out?
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Wednesday, April 7th, 2010 AT 9:21 AM

4 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Was the tune meant to address this misfire? Did it start misfiring after the tune?
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Wednesday, April 14th, 2010 AT 10:02 PM
Tiny
MPEAT1
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  • 3 POSTS
It didn't change. I even replacedthe #4 injector because that was what the code said was the cylinder that was miss firing the most. After running the vehicle with computer hooked up other cylinders showed misfires but not enough to set code.
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Thursday, April 15th, 2010 AT 10:12 AM
Tiny
FACTORYJACK
  • MECHANIC
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If it only misfires under extreme loads like towing, I would suspect ignition. If it is misfiring on all cylinders it could be lower than required fuel pressure, or a restricted exhaust. Another check would be compression, and leakdown. Can you get this misfire during a torque brake?
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Thursday, April 15th, 2010 AT 11:49 PM
Tiny
MPEAT1
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No not really. The computer shows some misfire when doing that but not that extreme to set code or make the vehicle shutter.
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Friday, April 16th, 2010 AT 9:25 AM

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