Diagnose this problem...
Thread Starter
Race Director
Joined: Jan 2002
Posts: 14,188
Likes: 288
From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
Diagnose this problem...
My car has been running real rough lately. Here are the symptoms:
OK. I replaced both sensors (pre-cat) and no dice. Checked the individual header temps and the ones on the right bank average from 180-210F, the ones on the left bank are averaging from 280-320F.
What could be the problem???
Thanks.
- Check Engine Light On. (Oxygen sensor. Right bank. Pre-cat.)
- Rough Idle. Sometimes sticks at 2000rpm, sometimes idles under 500rpm.
- Very bad gas mileage. 8 MPG.
- At some points the exhaust sounds very weird and sounds like a gurgle, and when I press the accelerator, it feels like the car has no power, and then it just "grabs" the power and the revs jump, and the wheels spin.
- Unburned gasoline can be smelled in the cabin at times, like the car is runing way rich.
OK. I replaced both sensors (pre-cat) and no dice. Checked the individual header temps and the ones on the right bank average from 180-210F, the ones on the left bank are averaging from 280-320F.
What could be the problem???
Thanks.
Le Mans Master
Joined: Oct 2007
Posts: 6,868
Likes: 770
From: Kelso Washington
St. Jude Donor '09, '13, '15
Intake manifold leak, left side?? Seems that side would run hotter if leaned out by an air leak. Air leak would explain rough idle and when you put some throttle to it, it over powers the leak more and runs somewhat better. Also might explain gas smell.
That's my guess and it's not a very educated one
That's my guess and it's not a very educated one
Instructor
Joined: Feb 2006
Posts: 173
Likes: 0
From: Palm Desert Ca
What is proper normally running Header temp?
Right side seems kind of cold to me for an exhaust manifold.
Raw gas - no fire? Bad Plug or injector on right side?
Pull Plugs and see if one or more are wet.
Also might check to see if one of your CATs are coming apart and plugged up?
Right side seems kind of cold to me for an exhaust manifold.
Raw gas - no fire? Bad Plug or injector on right side?
Pull Plugs and see if one or more are wet.
Also might check to see if one of your CATs are coming apart and plugged up?
Former Vendor
Joined: Apr 2007
Posts: 1,331
Likes: 4
From: Jacksonville Florida
The bad sensor threw off your fuel trims, when you replaced the sensor the bad fuel trims are still there, it will either take a couple days to learn itself right or you can unplug the battery for a while to clear them, should fix it 
Thread Starter
Race Director
Joined: Jan 2002
Posts: 14,188
Likes: 288
From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
