Running Rough and ck engine light on

Tiny
KATHYELLIOT
  • MEMBER
  • 2001 CADILLAC EL DORADO
  • FWD
  • 117,000 MILES
The check engine light comes on and flashes. Runs rough and takes a bit to warm up. Enter your question.
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Tuesday, April 5th, 2011 AT 7:32 PM

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Tiny
RASMATAZ
  • MEMBER
http://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
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Tuesday, April 5th, 2011 AT 8:00 PM
Tiny
CARADIODOC
  • EXPERT
A flashing Check Engine light means stop the engine immediately to prevent damage to the catalytic converter. Too much raw fuel is going into it and will cause it to overheat.

The rough running is the proof there is a misfire. That means there is unburned fuel, (and air) leaving the engine. It could be as simple as an overdue tune-up. New spark plugs and wires might solve the problem. GM also has a huge problem with their injectors. They are the only company that doesn't flow match them on the assembly line. They just stuff in a handful out of the bin. When they don't flow at the same rates, one cylinder will always be too lean, and the oxygen sensor will pick that up and tell the Engine Computer to add fuel to ALL of the cylinders on that side of the engine. Very often that doesn't show up until the the engine has high mileage and other things need attention, such as that tune-up.

Most mechanics start with the tune-up and hope that is all that's needed, but don't be surprised if the Check Engine light continues to turn on after that and more diagnosis is required.
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Tuesday, April 5th, 2011 AT 8:03 PM
Tiny
CADIEMAN
  • MEMBER
PUSH THE OFF AND WARMER BUTTONS ON THE INFO PANEL. WHEN YOU SEE ALL SEGMENTS LIT RELEASE. WRITE THE CODES DOWN AND THEN COME BACK.
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Tuesday, April 5th, 2011 AT 8:35 PM

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