Passenger Bank Running Lean
Thread Starter
Registered User
Joined: Jul 2002
Posts: 1,277
From: Phoenix, AZ
Passenger Bank Running Lean
I started feeling a miss about 3 miles from home. When I got home, I checked out my Datamaster logs I was taking at the time. You can see where the car begins to become lean on the passenger bank.
I assume this is a bad injector (dropped one on concrete from 4 ft during rebuild) since the bank is going lean. However, I did a quick check with my stethoscope and did not hear miss problems with any injectors.
Anything else it might be? If it was the opti I assume it would be too rich on the bank. Get this, when I put the stethoscope on the opti, it was growling like hell and I could hear a miss it it. This makes no sense since a miss would make a bank rich right?
Ben
I assume this is a bad injector (dropped one on concrete from 4 ft during rebuild) since the bank is going lean. However, I did a quick check with my stethoscope and did not hear miss problems with any injectors.
Anything else it might be? If it was the opti I assume it would be too rich on the bank. Get this, when I put the stethoscope on the opti, it was growling like hell and I could hear a miss it it. This makes no sense since a miss would make a bank rich right?
Ben
Registered User
Joined: Sep 2006
Posts: 30
From: CA
Oxygen sensors only measure oxygen, not fuel. Any misfire will result in a lean reading since the oxygen in the charge did not combine with the fuel (burn) to consume the oxygen and therefore the oxygen goes into the exhaust system unchanged. Yes, a spark induced misfire will cause a lean O2 sensor reading.
So, is the lean reading caused by the miss or is the miss a result of a lean condition? With the info given, the only thing you know for sure is that the passenger bank is affected.
Take a look at the datalog (or run another) and note the conditions under which the miss occurred. If it was under a light load, it's likely a vacuum leak. A heavy load would more likely indicate a spark miss or possibly a fuel injector problem.
So, is the lean reading caused by the miss or is the miss a result of a lean condition? With the info given, the only thing you know for sure is that the passenger bank is affected.
Take a look at the datalog (or run another) and note the conditions under which the miss occurred. If it was under a light load, it's likely a vacuum leak. A heavy load would more likely indicate a spark miss or possibly a fuel injector problem.
Thread Starter
Registered User
Joined: Jul 2002
Posts: 1,277
From: Phoenix, AZ
Yeah I just realized that. This would again confirm an opti problem.
Looked through the Datamaster log and you can see the BLM's on the pass. side stairstep up when in non PE mode (at PE they go to 128). After a few minutes, you see the BLM's level out in the 140's with the driver bank still in the 126-132 range where they should be.
Anyone else want to give input before I spend hours underneath my car and taking a new part off of a 38 mile rebuilt engine?
Looked through the Datamaster log and you can see the BLM's on the pass. side stairstep up when in non PE mode (at PE they go to 128). After a few minutes, you see the BLM's level out in the 140's with the driver bank still in the 126-132 range where they should be.
Anyone else want to give input before I spend hours underneath my car and taking a new part off of a 38 mile rebuilt engine?
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