2000 Chevy Impala OBD2 Codes and misfiring

Tiny
CLKEELE
  • MEMBER
  • 2000 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 179,250 MILES
I have a 2000 Chevrolet Impala with the 3.8L engine. This car has been such a nuisance for me. I recently had two different codes that showed on the pcm. P0171 which is my fuel is too lean and P0306 which is a cylinder misfire in cylinder #6. I have replaced my vacuum lines, replaced my Mass Air Flow Sensor, Replaced spark plugs and wires. The car, when parked or at a stop sign would continually jerk forward and back very hard at first. Once I changed the vacuum lines the problem has seemed to dissapate some. I still have a light jerking but now it will do it on the highway during high or low speads. My check engine light is constantly flashing telling me that the car is misfiring. I have talked to several mechanics and everyone I talk to has a different answer. Can someone please help me with this problem. I did throw two different EGR codes as well after replacing the vacuum lines but have since gone away within 30 miles of driving. I am totally lost on this and have already put a lot of money into the car, so much that I dont want to get rid of the car but I know not what else to do.
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Tuesday, March 30th, 2010 AT 1:28 PM

3 Replies

Tiny
RHALL77
  • MEMBER
Did you get the injectors cleaned? If not go to the dealer and have them do GM top engine cleaner. Also whats your fuel pressure? Have you replaced your fuel filter lately?
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Tuesday, March 30th, 2010 AT 2:51 PM
Tiny
CLKEELE
  • MEMBER
Yes I have replaced my fuel filter as well, but have not had my injectors cleaned. Thats the only thing I can think of is either I have an injector problem or its with the intake manifold. I know this particular engine has had a history of a bad intake manifold. I will clean the injectors and then try from there.
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Tuesday, March 30th, 2010 AT 5:54 PM
Tiny
CLKEELE
  • MEMBER
Ive gone to the dealer now and had gm top cleaner put through the system, still no luck, ive had it diagnosed with the same two codes mentioned above plus two other EGR codes. Ive been told now that it is my a combination of things so says Robertsons Tire, A Fuel Pump needs replaced along with my water pump, my electric cooling fan as my lower intake manifold, all coming to somewhere about $1800 as so mentioned, im lost Ive always had good experiences with Robertsons, but I honestly dont believe them knowing since the fact that somehow they didnt even remember putting a new water pump on in Dec. Of 2009 but when I mentioned it and found the receipt of purchase, mind you not the warranty copy, they still couldnt find the warranty copy on the system, which is understandable maybe an honest mistake until I took the car home and looked at the pump myself and there is no leak. The car drives fine at certain speeds the problem comes when coming to a stop or just trying to accelerate after slowing down, the car will start to jump a bit and then feel like its going to die. Can someone else give any other input about this problem
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Tuesday, April 6th, 2010 AT 5:59 PM

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