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Old 11-24-2009, 04:07 PM   #1
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Default po300 ob2 code

hello i have a 2000 bonneville with 296.000 k the promblems i am having is that the cat is burning out red after driving,no power when i stomp on the gas in gear driving, when i reset the code in idle it runs normal when cold but only in park, eventually the light comes back on and runs like crap it also had a small leak in the intake plenum any suggestions and what pecifically needs to be check
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Old 11-24-2009, 04:21 PM   #2
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Check the OBD area in tech info, that code is listed there. It will also give recomendations and links to write ups on how to correct the problems.
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Old 11-24-2009, 06:13 PM   #3
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Welcome to the Bonneville Forum Jason. Code po 300 is a real generalized one as youi can see if you looked it up in Tech Info. From what your saying, it sounds like your cat is clogged. Given your mileage, that would be very understandable.
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Old 11-24-2009, 06:42 PM   #4
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Welcome to the forum!!! here is a cat for you to check out 2.5" Goerlich Catalytic Converter OBDII 608226 - 608226 cheap and wont set off the engine light just need to put it in
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Old 11-24-2009, 08:20 PM   #5
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Hi Jason!

Welcome to the Bonneville Forum!

Please add your year and trim of your vehicle to your signature line. That way when you start asking questions in other areas of the forum, we all have a better idea on how to assist you. Click on "Quick Links" above, go down to "User Control Panel" and then click on "Edit your Signature" It'* pretty straight forward from there.

The P0300 is a random misfire and some issues that cause as well as some solutions are listed here. You'll have to work through them one at a time until you find the real reason and prevent it'* recurrence.

Please post your continuing saga of repairing this and asking for more help in the 2000-2005 Mechanical section.
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Old 11-24-2009, 10:31 PM   #6
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Welcome!!! How does it ride with the high miles?
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Old 11-24-2009, 10:36 PM   #7
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Thank you very much for all your recommendations sadly enough i am only in a grade 12 auto shop and the kids screw around so it takes about 10-45 believe or not for the class to get settled and listen to are very nice auto teacher at ldss so i have not gotten the chance to actually test everything or get a hoist available to check the O2 sensor i ran in threw the ob2 scanner and copied the info and check it all threw but i am still young a learning,im having her brought into my co op shop to be checked out with there better computer to pin point the problem and have it fixed upCheers
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Old 11-24-2009, 10:46 PM   #8
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i baby the car now it was well kept all highway driving indoor garage owned by one owner that manages or assistant manager of a napa so she had good parts put into it i am a teenager so i broke it loose u know and now its starting to feel it not to bad though gets about 600k a tank with i use lucas products in gas and synthentic motor oil and stabalizer hasnt had any major problems besides the common leak in the intake plenum fixed up with those pucks u throw it just had a rad flush done to her so it just needs a tune up right now because it its been misfiring
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Old 11-24-2009, 10:55 PM   #9
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The P0300 code is a real pain to track down. It can be so many different things. Generally it will be a weak spark. This can come from old or bad spark plugs, old plug wires, or old tired coils. A bad injector can also cause this code. I would suggest pulling the plugs and inspect them closely. They should all be a nice light gray color. If not, there'* a problem.
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Old 11-24-2009, 11:08 PM   #10
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hopefully my mechanic will be able to find and fix the problem i have school in the morning so have to drive my moms dodge caravan wohoo kinda funny because that bonneville replaced my 96 windstar that my parents let me used and i spent alot money fixing it and let it go to **** and then a 5 tonne smashed into me going over 80 and now i have to fight the ticket i got for making a unsafe left hand turn when the truck swerved into me?just got the statement disclogsure thing today sounded like he was stonned or sumthen?
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