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Looking for a littler advice, before I start throwing parts at this car...
My car is a '04 LS6 Z06, with full exhaust (long tubes, h-pipe and no cats), heads, cam and tune.
I took it to the detail shop to have it cleaned, but when I picked it up, I noticed it was running a little rough. Taking off from a dead stop was fine, but about mid gear, it seemed to stutter, however, if I rolled into the throttle, it seem to clean up. The drive is about 15 minutes from my house and about 5 or so miles before I got home, it started running pretty rough.. wouldn't hardly idle and then it threw a P0131 code.
I called a friend and he suggested I pull the MAF and clean it with a specific MAF cleaner, I did, as well as cleared the code, then took it for a short drive. It seemed to fix the problem at first.. Then, it started running the exact same way again, and again.. The light came back on the dash (CEL)...
I again, pulled the codes and now, not only did it have the P0131, but also had P0171 and PO175 codes.
He's now suggesting that I replace the MAF and both upstream O2 sensors (the down streams are plugged - no cats)
Before spend ~$250.00 on parts... I'd like to get a second (or third) opinion(s)?
P0131 - O2 Sensor Low Voltage Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0175 - Fuel Trim System Rich Bank 2
** The car has always had a strong rich fuel smell, I "assumed" it was due to the tune and cam? The cam has a pretty heavy chop to it..
The car is in the air, on my quick jack, but I haven't pulled the O2s to look at them yet, let me know if I should post some pics?
If you have a scan tool I can probably help with the diagnosis so we can look at the fuel trims and O2 sensor voltages…if not if you have a DVOM we can try that but a scan tool would be the best way to see what’s going on !!…I wouldn’t listen to your friend unless you want to shot gun parts !!
If you have a scan tool I can probably help with the diagnosis so we can look at the fuel trims and O2 sensor voltages…if not if you have a DVOM we can try that but a scan tool would be the best way to see what’s going on !!…I wouldn’t listen to your friend unless you want to shot gun parts !!
Awesome! Thank you, and I have both a scan tool and a DVOM!
and no... I'll clean parts, but spending $250 on parts that "might" fix it.. Is not something I want to do..
Awesome! Thank you, and I have both a scan tool and a DVOM!
and no... I'll clean parts, but spending $250 on parts that "might" fix it.. Is not something I want to do..
OK, as far as the P0131 “low voltage”(either bad sensor or wiring) to make sure it isn’t a wiring issue with the sensors let’s remove the O2 SEN fuse #6 and with your scan tool hooked up you should see 450mv on all 4 sensors (the bias voltage) with the key ON engine OFF…if low like 100mv which may be a short to ground on the high signal circuit unplug the O2 sensor connector on bank 1 (left side) and if it goes to 450mv the harness side wiring is fine to the PCM…if now 450mv we can test the sensor side wiring…when the sensor is stone cold you should see OL (ohm check) on your DVOM when checking the 2 wires that are NOT the same color… they should be purple/white and tan/white for bank 1…if it is still low using the scan tool with the connector unplugged you have a wiring issue on the high signal circuit most likely…we will need your DVOM to diagnose that..now let’s start the car and see what the fuel trims are and if the PCM goes into “closed loop”…if car stays in open loop your short terms will show 0…let me know what your long terms fuel trims and what your O2 sensors are doing at idle…they should be oscillating between 200-800mv and if bank 1 is stuck lean and reading 100-200 Mv spray some Brakekleen into the intake or filter and see if the O2 responds and goes rich to 900mv or so…and let us know what your long term fuel trim numbers are…also the MAF sensor when the car is warmed should read around 6 grams/second. Lot of info here so I’ll stop. Tomorrow if you have questions you can PM me your number if you need help !!…as far as the bank 1 lean and bank 2 rich that is not common so we can check fuel trims and see what’s going on !!…my buddy Matt has a great YouTube channel and this 2 part video is really good if you want to learn this stuff so grab a cold one and watch them !!
OK, as far as the P0131 “low voltage”(either bad sensor or wiring) to make sure it isn’t a wiring issue with the sensors let’s remove the O2 SEN fuse #6 and with your scan tool hooked up you should see 450mv on all 4 sensors (the bias voltage) with the key ON engine OFF…if low like 100mv which may be a short to ground on the high signal circuit unplug the O2 sensor connector on bank 1 (left side) and if it goes to 450mv the harness side wiring is fine to the PCM…if now 450mv we can test the sensor side wiring…when the sensor is stone cold you should see OL (ohm check) on your DVOM when checking the 2 wires that are NOT the same color… they should be purple/white and tan/white for bank 1…if it is still low using the scan tool with the connector unplugged you have a wiring issue on the high signal circuit most likely…we will need your DVOM to diagnose that..now let’s start the car and see what the fuel trims are and if the PCM goes into “closed loop”…if car stays in open loop your short terms will show 0…let me know what your long terms fuel trims and what your O2 sensors are doing at idle…they should be oscillating between 200-800mv and if bank 1 is stuck lean and reading 100-200 Mv spray some Brakekleen into the intake or filter and see if the O2 responds and goes rich to 900mv or so…and let us know what your long term fuel trim numbers are…also the MAF sensor when the car is warmed should read around 6 grams/second. Lot of info here so I’ll stop. Tomorrow if you have questions you can PM me your number if you need help !!…as far as the bank 1 lean and bank 2 rich that is not common so we can check fuel trims and see what’s going on !!…my buddy Matt has a great YouTube channel and this 2 part video is really good if you want to learn this stuff so grab a cold one and watch them !!
I'm headed to the garage now, to see what i can figure out - if I get stumped..... I'll let you know!
Maybe when you had it detailed and I don’t know if they detailed the engine bay maybe some connectors may have had some water intrusion but we will see what happens !!
Maybe when you had it detailed and I don’t know if they detailed the engine bay maybe some connectors may have had some water intrusion but we will see what happens !!
I doubt it, it was just exterior detail.
I was just about to ask you... # 6 fuse under the hood is "Fog Lamps' and in the footwell, # 6 is "PK T/ LMP".. This is the fuse for the 02 sensor? ** Remember, I'm working on a 2004 Z06
[QUOTE=65coop;1604597546]I doubt it, it was just exterior detail.
I was just about to ask you... # 6 fuse under the hood is "Fog Lamps' and in the footwell, # 6 is "PK T/ LMP".. This is the fuse for the 02 sensor? ** Remember, I'm working on a 2004 Z06[/QUOTE
P0131 + P0171 + P0175 Codes...
