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2000 Cadillac EL Dorado engine misfiring, SES light flashing

Tiny
ALFOWL
  • MEMBER
  • 2000 CADILLAC ELDORADO
  • AUTOMATIC
  • 90,000 MILES
My 2000 eldorado esc has been driving rough. Engine misfiring, SES light flashing, but only while accelerating, stays lit while idle. Drives fine for about.20 minutes, but once engine is heated, begins to misfire. Had this same issue 2 years ago, replaced plugs, boots, and front ignition coil. Problem was fixed. This time around, we replaced the plugs, boots, and rear ignition coil, but the problem remains. Any ideas on what it Could be?
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Monday, March 23rd, 2015 AT 1:52 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Was the computer scanned to determine which cylinders are misfiring?
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Tuesday, March 24th, 2015 AT 5:03 AM
Tiny
ALFOWL
  • MEMBER
  • 4 POSTS
No, tonight we are going to have it put on the computer, so hopefully we will know more then!
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Tuesday, March 24th, 2015 AT 5:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Let me know what you find. To me, it sounds like a bad coil. You may have just replaced the wrong ones.
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Tuesday, March 24th, 2015 AT 5:19 AM

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