CEL issues - DynoScan Results.
Thread Starter
5th Gear
Joined: May 2011
Posts: 5
Likes: 0
From: O'Fallon Illinois
CEL issues - DynoScan Results.
Hello all,
I have been on the site for a short while but I have not posted anything. I have recently purchased a 2001 Convertible / Manual with a lot of miles on it (109,000) and a few days after purchase, the CEL came on. I checked the codes and found P0172 / P0175, indicating that both bays are running rich.
Since then, I have changed plugs, wires, front O2 sensors, cleaned the MAF sensor with MAF sensor cleaner, changed oil/filter, changed air filter.
I still have the same problem. So, I connected the laptop with DynoScan and ran three recordings:
Normal drive:
https://docs.google.com/leaf?id=0B1e...kMjhm&hl=en_US
Idle:
https://docs.google.com/leaf?id=0B1e...hM2U0&hl=en_US
Idle, then drive:
https://docs.google.com/leaf?id=0B1e...mMjc2&hl=en_US
I also have a copy of the codes and freeze frame here:
If anyone has any ideas, I would appreciate the help. I used to have a 1996 Vette and from memory (long time ago) that could accelerate better than this 2001. Sometimes it feels great and sometimes not, just sluggish, sometimes I feel hesitation also. I just want it to run smooth and without CEL
I am not sure if anyone had done any mods on the car.
I have been on the site for a short while but I have not posted anything. I have recently purchased a 2001 Convertible / Manual with a lot of miles on it (109,000) and a few days after purchase, the CEL came on. I checked the codes and found P0172 / P0175, indicating that both bays are running rich.
Since then, I have changed plugs, wires, front O2 sensors, cleaned the MAF sensor with MAF sensor cleaner, changed oil/filter, changed air filter.
I still have the same problem. So, I connected the laptop with DynoScan and ran three recordings:
Normal drive:
https://docs.google.com/leaf?id=0B1e...kMjhm&hl=en_US
Idle:
https://docs.google.com/leaf?id=0B1e...hM2U0&hl=en_US
Idle, then drive:
https://docs.google.com/leaf?id=0B1e...mMjc2&hl=en_US
I also have a copy of the codes and freeze frame here:
If anyone has any ideas, I would appreciate the help. I used to have a 1996 Vette and from memory (long time ago) that could accelerate better than this 2001. Sometimes it feels great and sometimes not, just sluggish, sometimes I feel hesitation also. I just want it to run smooth and without CEL
I am not sure if anyone had done any mods on the car.
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
You need a tune on that car. You really shouldn't have long term fuel trims above 5% and yours are showing 14%. If your car doesn't have a cold air intake or headers there is a good chance that it used to have them and it was tuned for them. Lots of times people will return the car to stock before selling - and it looks like they neglected to return your tune to stock. It would be an easy fix for someone local with HP Tuners or EFI Live. Come down to Alabama and I'll hook you up.
Thread Starter
5th Gear
Joined: May 2011
Posts: 5
Likes: 0
From: O'Fallon Illinois
You need a tune on that car. You really shouldn't have long term fuel trims above 5% and yours are showing 14%. If your car doesn't have a cold air intake or headers there is a good chance that it used to have them and it was tuned for them. Lots of times people will return the car to stock before selling - and it looks like they neglected to return your tune to stock. It would be an easy fix for someone local with HP Tuners or EFI Live. Come down to Alabama and I'll hook you up.
