Random misfire, with codes??
Thread Starter
4th Gear
Joined: Jan 2014
Posts: 4
Likes: 0
From: Salt Lake City Utah
Random misfire, with codes??
I am getting a random misfire on my 07 vette. Rough idle has gotten progressively worse. The following codes are displayed:
P0151
P0300
P1153
P0152
P0174
Upon reading up on this it could be an O2 censor, A bad battery, bad ground. It had Granatti plug wires but I put factory back on. Still getting same codes. ONLY modifications are... K&N Intake and Magnaflow Exhaust. Engine had 27,000 miles.
Never driven in rain, very clean. I checked for airflow leaks in intake, none found.
ANY thought before I pay Dealer hundreds for something that may be $50.00??
Thanks
P0151
P0300
P1153
P0152
P0174
Upon reading up on this it could be an O2 censor, A bad battery, bad ground. It had Granatti plug wires but I put factory back on. Still getting same codes. ONLY modifications are... K&N Intake and Magnaflow Exhaust. Engine had 27,000 miles.
Never driven in rain, very clean. I checked for airflow leaks in intake, none found.
ANY thought before I pay Dealer hundreds for something that may be $50.00??
Thanks
Melting Slicks
Joined: Oct 2010
Posts: 2,220
Likes: 16
From: Sugarhill Ga
when did the light come on? Check to make sure that all clamps are on tight. Then clean the mass with special mass cleaner. Then check fuel pressure. Then make sure that the spark plug wires are tight. Sometimes they can wiggle loose and make sure the #1 wire is away from the alternator. Why did you change the wires at 27k ? Did you change plugs, did you use delco plugs? Could you have cracked one ? Did you replace the mufflers or the mid pipe also ? Could the harness for the 02 sensors be grounding out onto the exhaust ? Start working backwards since you first noticed the problem.
Thread Starter
4th Gear
Joined: Jan 2014
Posts: 4
Likes: 0
From: Salt Lake City Utah
when did the light come on? Check to make sure that all clamps are on tight. Then clean the mass with special mass cleaner. Then check fuel pressure. Then make sure that the spark plug wires are tight. Sometimes they can wiggle loose and make sure the #1 wire is away from the alternator. Why did you change the wires at 27k ? Did you change plugs, did you use delco plugs? Could you have cracked one ? Did you replace the mufflers or the mid pipe also ? Could the harness for the 02 sensors be grounding out onto the exhaust ? Start working backwards since you first noticed the problem.
Mufflers were also changed. the problem started with a slight misfire. I thought maybe bad gas. All of a sudden it went to crap after about 30 days. On start-up its fine for about 1 minute at idle. it will start to run rough for about 10 seconds and the computer or something corrects it for about 45 seconds and it will do it again. vicious cycle or same idle issue.
My concerns are the vehicle didnt get driven much and an O2 censor is bad or something like that. All of the codes refer to bank 2 censor 1 if I am not mistaken.
Thread Starter
4th Gear
Joined: Jan 2014
Posts: 4
Likes: 0
From: Salt Lake City Utah
response
The light came on when the idle got really rough in the past few days. It had misfired a few times very slight. Once it went crazy the light came on.
I should also mention the very strong odor of un-burned fuel (rich) at the exhaust during this misfire.
I should also mention the very strong odor of un-burned fuel (rich) at the exhaust during this misfire.
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Somethings definitely borked with the passenger O2. And with either of the O2's malfunctioning it throws the car into open loop full time which would explain the unburnt gas smell.
Thread Starter
4th Gear
Joined: Jan 2014
Posts: 4
Likes: 0
From: Salt Lake City Utah
thanks
I will start with the O2 sensor. Everything is pointing that direction. Now I have to wait for it to be shipped.
