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2000 Eldorado Running rough after fillup


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allyn0
New User

Jan 12, 2013, 5:56 PM

Post #1 of 4 (1268 views)
2000 Eldorado Running rough after fillup Sign In

I have a 2000 Cadillac Eldorado with 63,000 miles. The car has been perfect up until this point. Yesterday after work, I filled up with premium unleaded fuel and my car drove home just fine. This morning while leaving for work, I noticed the car was running very rough. Particularly when i was backing out of my driveway, and accelerating. Once up to speed, the car seemed fine. But accelerating after a full stop, it's very shaky, the whole inside of my car vibrates. Also, the service engine light is flashing, but only when the car is in motion. Once idle, the flashing stops but the light remains lit. Any ideas what could be wrong? Bad gas? Any help would be greatly appreciated!!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 12, 2013, 6:19 PM

Post #2 of 4 (1252 views)
Re: 2000 Eldorado Running rough after fillup Sign In

You have a severe misfire for some reason and you need to find out why. You may have gotten some water with that tank of fuel. The flashing light means to stop driving it because you are damaging the Catalytic Converter.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



allyn0
New User

Jan 17, 2013, 4:42 PM

Post #3 of 4 (1178 views)
Re: 2000 Eldorado Running rough after fillup Sign In

We had a family friend come out and put a computer on the car and it said that spark plugs 6 and 8 were misfiring. So we replaced all the spark plugs and boots, and its running a little better, but still not good. Hopefully we can get him to come out and check again


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 17, 2013, 6:29 PM

Post #4 of 4 (1169 views)
Re: 2000 Eldorado Running rough after fillup Sign In

The computer didn't tell you anything was wrong with any spark plugs. What you likely had were codes P0306 and P0308 which means the computer detected misfires on those cylinders but a tech still needs to determine the actual cause. It could be an ignition problem, could be a fuel problem. That is what the tech is for.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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