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My buick Century (2000) is running ragged and rough.. (Started sunday) and the Service Engine light is FLASHING!!! --Service Engine light has been on, but it has never flashed. I notice when i speed up a little bit--the car seems to run better but when I slow down or begin to take off you can hear that sound much more noticeable..and the roughness seem to vanishes after it has pick up speed.. I have change the wires, plugs, and the one of the coil packs (3*6)..It is still not running like it should.. Where can I start and what could a solution be?

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Do NOT drive your car if you have a condition that is causing your check engine to flash. As the prior answer said, you need to check the On Board Diagnostics with a code reader to find out what is causing your CEL to flash. It could be a cylinder is misfiring which would mean your gas is not igniting and going through the catalytic converter. This could shorten the life of the cc which could lead to an expensive repair.

Posted on May 02, 2017

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Get thee a Chiltons/Haynes repair manual for your make/model/year. The troubleshooting section will offer possible causes of your problem. We had same problem, then pulled new (supposedly pre-gapped plugs) and found the gap to be wrong. Could be one of those idle position/throttle position sensors. Is it throwing any codes? An OBD-II should cover this year of vehicle.

Posted on May 02, 2017

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Posted on Jan 02, 2017

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SOURCE: running rough, no power misfiring

i had that problem once. when i got under half a tank of gas in the tank. What i did was i dumped one bottle of gas line deicer in the tank and i have never had it agian. you may have some water in the tank. from condasation or i have a stong feeling i got my water from the gas station. i was using the same station all the time. so i tryed another gas station and so far no more rough idleing which was caused by the water i think and i am getting better fuel milage to. i hope this helps.

Posted on Jul 26, 2009

SOURCE: Car coded yesterday p0303 noe check engine light flashing

The only thing left is the injector or a vacuum leak on the manifold gasket sucking air in and causing a lean condition. Thats is its the only common issue providing you dont have a head gasket issue leaking coolant on that cylinder and the compression and valves are not leaking. The old spark plug should show a coolant issue if present. The white part will be shiney if you have a coolant loss. If the coolant is looking real dark you should have the cooling system checked for gas being pushed into the cooling system on compression stroke thru the head gasket.

Posted on Nov 12, 2009

techbuster
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SOURCE: 99 Buick Lesabre Check engine

From the symptoms of the problem and the precautions you have done i think its time to check the EGR valve.Clean your EGR valve and then put it again. How handy you are in ding this?

As the check engine light is on did you scan for error code which will help you more specific to locate the problem.

Posted on Sep 23, 2011

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1 Answer

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