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Check Engine Light - P0171 & P0174
My car is a 2004 - 6 with the 3.0L V6 and manual transmission. I've owned the car since it had 18 miles on it. It now has about 98.7K mi. I had a problem when I first got the car with the check engine light (<250 miles) but beside that it has run fine. About 3 days ago I got the dreaded CEL. Took it to advanced auto parts and got the P0171 & P0174 both banks too lean.
When I start the car in the morning the car idles high around 1500rmp, usually its around 750-800 rmp... After running it for a while the idle will return to normal. Any idea what may be the problem. I read how to clean to MAF sensor, and may try to do that this weekend. I also notice a burning smell of possibly oil, two days before the check engine light came on, when I went back into the enclosed garage after driving home from work. Noticed this smell again one my way home from home depot after I reversed outta the parking spot, and then about two minutes later the CEL came on... not sure if they are related at all. Have not smelled the bad smell these past two days....I checked the oil level this morning and it seems to be fine.....I had a small oil leak about 3 months ago from a faulty oil plug, so I always park over cardboard in the garage. There are about 5 dime size oil spots on the cardboard from the previous 3 months.
Any suggestions will be greatly appreciated.
Also, I had a tune up about 20-25k miles ago from the stealership about 2 years ago
Last edited by dukerollz555; 12-09-2011 at 10:58 AM.