Need someone to look at this datalog and tell me why my car runs like CRAP! PLEASE!
Thread Starter
Registered User
Joined: Apr 2003
Posts: 892
From: Dallas/Fort Worth
Need someone to look at this datalog and tell me why my car runs like CRAP! PLEASE!
I am having trouble with my 95 T/A since I rebuilt the motor it has been having a high rpm stutter, now its gotten worse.
The first log I ran showed a DTC on the o2 sensors saying they had failed. I checked them out and when I extended the wires a one on each side came undone while installing without me noticing.
I noted that the mv's on the o2's stayed around 450 +/-10mv the whole time. I redid the connections and ran the following datalog. My mod list can be seen below and all is the same except I now am running a T56. The tune was done by PCMforless and the speedo sensor is way off (due to it being tuned for a 3 speed auto).
The datalog is in .uni format made in TTS datalogger:
http://www.triplecfeeders.com/images/ta/james.uni
PLEASE HELP!
The first log I ran showed a DTC on the o2 sensors saying they had failed. I checked them out and when I extended the wires a one on each side came undone while installing without me noticing.
I noted that the mv's on the o2's stayed around 450 +/-10mv the whole time. I redid the connections and ran the following datalog. My mod list can be seen below and all is the same except I now am running a T56. The tune was done by PCMforless and the speedo sensor is way off (due to it being tuned for a 3 speed auto).
The datalog is in .uni format made in TTS datalogger:
http://www.triplecfeeders.com/images/ta/james.uni
PLEASE HELP!
Registered User
Joined: Sep 2004
Posts: 271
From: Canfield, OH
Re: Need someone to look at this datalog and tell me why my car runs like CRAP! PLEASE!
It seems you may have some of the same problems that I do.
Usually a stutter is primarily ignition related, then valve related, then fuel.
If you notice, the right side Lterm is way higher than the left Lterm by 10 points or more at certain times (usually in cell 11 and 18) indicating that it is leaner than the left. The histogram shows this as well.
Check the following:
Bad plug wire on right side
Bad plug on the right side
Plug wires pulling loose from opti
Exhaust valve sticking open or rocker adjusted too tight.
Exhaust leak.
Usually my #6 wire pulls loose from the opti and gives me the same split blm's. Although my problem seems to be related to the Charcoal Canister Purge Duty Cycle (CCP DC). I haven't found the exact problem yet. But reattaching the plug wire seems to help.
One difference is that my O2's are all over the place (range from the 100's to 900's) and constantly changing. Your's are almost always in the 400's and 500's. Mine are brand new AC units. How old are yours? I've been told they only last about 70k miles. I know that 450 something mV is the correct A/F ratio, which would make your readings really good. I've never seen anyone else's files so I don't know which one of our's is acting correctly.
First check the above, and then hopefully, someone can chime in and find the appropriate cure for the both of us.
Good Luck!
Usually a stutter is primarily ignition related, then valve related, then fuel.
If you notice, the right side Lterm is way higher than the left Lterm by 10 points or more at certain times (usually in cell 11 and 18) indicating that it is leaner than the left. The histogram shows this as well.
Check the following:
Bad plug wire on right side
Bad plug on the right side
Plug wires pulling loose from opti
Exhaust valve sticking open or rocker adjusted too tight.
Exhaust leak.
Usually my #6 wire pulls loose from the opti and gives me the same split blm's. Although my problem seems to be related to the Charcoal Canister Purge Duty Cycle (CCP DC). I haven't found the exact problem yet. But reattaching the plug wire seems to help.
One difference is that my O2's are all over the place (range from the 100's to 900's) and constantly changing. Your's are almost always in the 400's and 500's. Mine are brand new AC units. How old are yours? I've been told they only last about 70k miles. I know that 450 something mV is the correct A/F ratio, which would make your readings really good. I've never seen anyone else's files so I don't know which one of our's is acting correctly.
First check the above, and then hopefully, someone can chime in and find the appropriate cure for the both of us.
Good Luck!
Thread
Thread Starter
Forum
Replies
Last Post
1996LT1Z28
Middle Atlantic
3
Dec 4, 2014 09:37 PM
1996LT1Z28
Show and Shine / Paint and Body Care
2
Dec 4, 2014 09:20 PM
ro2207
LT1 Based Engine Tech
14
Dec 4, 2014 06:18 PM