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Discussion Starter · #1 ·
Total newbie here!

Against my better judgment, I purchased subject veh from a Co-part (insurance auction specialist) facility. Not only do they do insurance auctions on wrecked veh, they will also sell your donated vehicle or just sell for anyone that does not want to deal with the transaction. One major problem in doing what I did is that you really can't go for a test drive. You can inspect and start the vehicle and put it in gear and move it forward and backward a few feet but cannot go for a test drive. Historically, you could get a vehicle pretty cheap but in recent times, there has been a lot of buyer competition from foreign countries, especially Mexico.

It's a one owner and cosmetically, in pretty good shape. Mechanically, SERVICE TRACTION, SERVICE ESC and CEL (P0303). Also the idle is pretty rough but it seems to smooth out when rev'd up. Pretty common stuff. There was a shop sticker on it and I was able to determine that the owner was using full synthetic 5w30 and an OCI of 5K.

I've spent no time on it but when I do I'll start with eliminating a portion of the engine cover and putting the metal duct for air between the filter box and the throttle body. I saw two Youtube videos that said that the better ducting and sealing could eliminate all three of those problems and maybe fix the rough idle too. That would be a boon! I'm probably dreaming on that - but those problems seem fixable without too much expense. I'll pursue them to a final resolution.

Questions:
1) with 197K what are the chances that the timing chain has not been replaced? Setting aside the rough idle, the engine runs smoothly and do not have any unpleasant noises coming from it.
2) does GM have a site where one can enter the VIN and get a report on dealer maintenance? Toyota and others have this but have not been able to find for GM.

Thanks,
Larry
 

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Discussion Starter · #2 ·
Just for parts ordering accuracy, I pulled the engine cover today to have a look at the throttle body. Amazingly dirty and caked-carboned up - can't wait to clean it up. I expect the cleaning will cure the rough idle and the P303. Will report back.
 

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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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Don't spray the cleaner directly into the TB. Spray the rag, then wipe. What you want to prevent is getting any down inside the TB motor cavity, which could cause issues.

Eventually, you'll also want to get someone with a dealer-level scanner to reset the accrued adjustment the ECM makes for a dirty TB, since it won't "learn" that you cleaned it and reset itself. That is something that member @Rodents taught me.
 

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p303 is usually a plug. First step is to put in a fresh set of AC plugs, use AC as they perform the best in Chevy's.
Misfires will kill the cat. convertor so get on it fast to save money.
 
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