Looking for Help With Scanner Readings
Thread Starter
Drifting
Joined: Dec 2008
Posts: 1,254
Likes: 3
From: Souderton Pa.
Looking for Help With Scanner Readings
I have a 95 LT1 with 88,000 miles and I am throwing a code 64. I know that is an O2 sensor on the right side. Which one is it? Is it before the cat or after? In the fall I replaced the one after the cat and it was fine, at least for a little while but not much driving over the winter. Now the code is back.
So I hooked up my scanner and took some pictures of the screens. So if you guys could help me figure out what my problem could be, I would really appreciate it. I don't want to just throw money at the car and I want it fixed the right way the first time. The engine light comes and goes. It comes on after just a few minutes and it may turn off after some driving only to return at the first stop light. Here are the pictures:
The first picture shows an Inj L PW value of 0, is this something to be concerned with and is this an injector issue?
So I hooked up my scanner and took some pictures of the screens. So if you guys could help me figure out what my problem could be, I would really appreciate it. I don't want to just throw money at the car and I want it fixed the right way the first time. The engine light comes and goes. It comes on after just a few minutes and it may turn off after some driving only to return at the first stop light. Here are the pictures:
The first picture shows an Inj L PW value of 0, is this something to be concerned with and is this an injector issue?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
The Scan doesn't tell you much because it's Open Loop and it's going to stay there as long as the Code is Active.
The 64 is the Header Sensor and it can be pegged lean for a couple of reasons. The trouble tree for your Year would help, but you could start by making sure the signal wire isn't grounding somewhere. You could then clear the Code and clamp off the header hose and then start it up to see if it comes back. If it doesn't, suspect that the Header Check Valve is faulty. If the Code is still present, monitor the voltage and if it isn't variable, replace the Sensor.
The 64 is the Header Sensor and it can be pegged lean for a couple of reasons. The trouble tree for your Year would help, but you could start by making sure the signal wire isn't grounding somewhere. You could then clear the Code and clamp off the header hose and then start it up to see if it comes back. If it doesn't, suspect that the Header Check Valve is faulty. If the Code is still present, monitor the voltage and if it isn't variable, replace the Sensor.
Thread Starter
Drifting
Joined: Dec 2008
Posts: 1,254
Likes: 3
From: Souderton Pa.
The Scan doesn't tell you much because it's Open Loop and it's going to stay there as long as the Code is Active.
The 64 is the Header Sensor and it can be pegged lean for a couple of reasons. The trouble tree for your Year would help, but you could start by making sure the signal wire isn't grounding somewhere. You could then clear the Code and clamp off the header hose and then start it up to see if it comes back. If it doesn't, suspect that the Header Check Valve is faulty. If the Code is still present, monitor the voltage and if it isn't variable, replace the Sensor.
The 64 is the Header Sensor and it can be pegged lean for a couple of reasons. The trouble tree for your Year would help, but you could start by making sure the signal wire isn't grounding somewhere. You could then clear the Code and clamp off the header hose and then start it up to see if it comes back. If it doesn't, suspect that the Header Check Valve is faulty. If the Code is still present, monitor the voltage and if it isn't variable, replace the Sensor.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
The 64 means the right O2 is pegged below .35 volts or an extreme lean condition on the right side. Either the O2 isn't working (it's heated and that part of it fails more often then the Signal side) or often there's a ton of air flowing past the Sensor from some sort of exhaust leak. It has nothing to do with the O2's that monitor CAT efficiency - assuming you have the usual setup of 1 before the CAT and then 1 after performing this task - there should also be 1 O2 for each header which the ECM uses to monitor/control fuel delivery.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
I would pull the plugs and make sure you do not have a dead cylinder from a bad plug bad injector bad wire bad rocker arm bad valve etc. Make sure it is running on all 8 and the plugs are the quickest way to know a compression test or leak down test nevers hurts either and something you want to do if you have a dead hole for no obvious reason. Does the car miss even if only occasionally? A MAP sensor reading of 10" I personally find somewhat interesting unless it does not have a stock cam...
Thread Starter
Drifting
Joined: Dec 2008
Posts: 1,254
Likes: 3
From: Souderton Pa.
Thanks for the info, now I understand what you were saying better. The car is stock as far as I know, so I believe it is the stock cam. As far as O2 set-up, yes it is 1 before & after the cat.
Now as far as it goes with an exhaust leak, would it be obvious? Would I be able to hear it?
Now as far as it goes with an exhaust leak, would it be obvious? Would I be able to hear it?
