At my wits end...
Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
At my wits end...
I have been having this problem for months and just can't fix it. The car has headers, high flow cats, BBK intake,throttle body and manifold. 3:42 rear end, yank 3200 stall and dyno tuned by Charlie at RPM in california. The car will periodicly start to surge and sputter at 30-40 mph and 1000 rpm. Some times the check engine light will flash and go out and some times it will set. It has happened to me two days in arow now but will than not happen for weeks. When the check engine light flashed three or four times and didn't stay on I checked for codes when I got home and had: P1415 - air system bank 1, P0300 - random/multiple cyclinder misfire, P0175 and P0172 - fuel trim banks 1 and 2 too rich, and finally P0155 - 025 heater circuit bank 2 sensor 1 malfuction. Today it surged and the check engine light came on and stayed on and set codes P0175 and P0172 - Fuel trim bank 1 and 2 too rich. I have checked the grounds under the battery, drivers side engine block, and the ground by the drivers side headlight. Any one have any ideas I'm open to them. Thanks in advance, Laurence 
Advanced
Joined: Jul 2006
Posts: 68
Likes: 0
From: Lyndon, KS
Has the AIR system been disabled or removed?
It sounds like an ignition problem to me, wires too close to headers, or one or more ignition coils failing. If you get a misfire (the 300 code and the flashing check engine), it will sometimes set a fuel trim code. Were all of these codes current (C) or some history (H) ?
Jon
It sounds like an ignition problem to me, wires too close to headers, or one or more ignition coils failing. If you get a misfire (the 300 code and the flashing check engine), it will sometimes set a fuel trim code. Were all of these codes current (C) or some history (H) ?
Jon
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
I'm almost certain your front O2 sensors are crossed. My car expereinced the same symptoms....some call it "tractoring"
After about 2-10 minutes of driving, the car will seem to return to normal. What the computer's doing is reverting back to base fuel maps and ignoring the O2 sensors. You'll have a check engine light too.
After about 2-10 minutes of driving, the car will seem to return to normal. What the computer's doing is reverting back to base fuel maps and ignoring the O2 sensors. You'll have a check engine light too.
Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
No I have not pulled the plugs. I'll have the problem two or three days in a row and than every thing will be ok for a couple of weeks. That is what is driving me up the wall. It is an interrmitten problem. 
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Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
Got under the car and from what I can tell the O2's are ok. I didn't find any wires broken or touching the headers. I've been wondering if when the torque converter locks up and such a low rpm that it could be bogging down the motor almost like shifting from 1st to 6th.
Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
I drove around today with the laptop and HP tuner scan on and the car acted up. So now I at least have some data to see what might be happening. When the car started to stutter and surge the LT bank 1 and 2 graphs what red so it looks like somethng is causing the fuel trim to go full rich. It set two codes ( fuel trim banks 1 and 2 too rich)but no check engine light. I sent the data to Charley at RPM with hops he could help.
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
Having a mid year C5, it's a distinct possibility that your O2 sensors may have just done dead...or be going dead. O2 sensors fail like batteries...slowly at first then completely. This would cause intermittant missing and occasional rich mixture.
how many miles do you have on your car?
how many miles do you have on your car?
Race Director
Joined: Dec 2003
Posts: 12,599
Likes: 1
From: Texas
My buds TA was having problems like this. Never found out 100% for sure what was the culprit but seems that he was getting bad gas. Stopped going to one of the gas stations in his town and the problem has never returned. Could be that we had it scheduled for a retune, you know how that works- take it to the mechanic and the car works fine LOL!
Good luck!
Good luck!
Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
I have 74,000 miles on the car. When I was scaning the car with the HP software the O2 sensor grafts looked normal when the fuel trim went nuts. Maybe I need to change all 4 O2 sensors
Thread Starter
Racer
Joined: Jan 2006
Posts: 394
Likes: 5
From: West Point Utah
Charlie at RPM says from the looks of the data I sent him the O2 sensors are not responding fast enough. At least I have some idea what is the problem. Sent another scan and waiting to see what to try next. Charlie is the best.
