Topic starter. Buick LeSabre, 2002, 279k, 3800V6, virtually all highway miles, runs good otherwise, brief stumble and code P0300 with flashing Service Vehicle Soon light when letting off the power at highway speed. None when back under power, or at any time around town at lower speeds or idle. Higher rpm at idle too, +10 degrees F. Thoughts?. P0300 code in 2000 buick lesabre. Run good for about two days, then the service engine light comes on, and it run rough. Posted by Anonymous on Mar 12, 2013. Want Answer 0. Clicking this will make more experts see the question and we will remind you when it gets answered. Comment; Flag; More. Print this page;. A leaking fuel pressure regulator can cause your car or truck to be hard to start or die out. This may give a check engine light, also. It's a very common problem on many Chevy, Buick, Pontiac, and Oldsmobile 3.1L - 3.4L V6 engines. These are also know as the 3100 and 3400. Misfire codes P0300 and oxygen sensor codes will be stored in the computer memory. So, if you want to learn how to check.

. The heart of the Oldsmobile LSS was GM's Buick 3800 V6, an engine known .... A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. 98,000 miles. My husband and I bought a used 2002 Buick Rendezvous. We really needed and new and bigger car. We saw this car and even though used it was pricey but at the moment it was well worth.
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