What could be causing this?
01-29-2003, 09:21 AM
#1
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What could be causing this?
Still fighting the misfire problem...
I put a second O2 sensor on the passenger side of car (the ECM runs off of the one on the driver side). I then switched the ECM to the passenger side and here's what I found.
On the passenger side, the Block learn shoots up to 160, injector pulse width is at 4 ms, and the O2 sensor shows under 10 mV.
On the driver side, the Block Learn is down around 100, injector pulse width is 2 ms, and the O2 sensor is predominantly in the 700-900 mV range.
Any thoughts? I'm quickly running out of ideas....
I put a second O2 sensor on the passenger side of car (the ECM runs off of the one on the driver side). I then switched the ECM to the passenger side and here's what I found.
On the passenger side, the Block learn shoots up to 160, injector pulse width is at 4 ms, and the O2 sensor shows under 10 mV.
On the driver side, the Block Learn is down around 100, injector pulse width is 2 ms, and the O2 sensor is predominantly in the 700-900 mV range.
Any thoughts? I'm quickly running out of ideas....
01-29-2003, 11:43 AM
#2
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Car: Iroc-Z
Engine: 355 AFR'd HSR
Transmission: 700R4
If the block learn goes to 160 and stays there then the O2 sensor is shorted out and its sending a high voltage indicating a rich condition so that the motor doesn't lean itself out completely and start melthing things. I know this for a fact because I had the same problem. The car would idle up and down and never find an idle. I picked up a Bosch O2 sensor and the problem IMMEDIATELY went away when I started the car.
On the other hand, the injectors may be playing into this too. You may have faulty injectors/wiring on one side of the block.
I would try the Bosch O2 sensor first. It was the best $25 or $30 I ever spent when diagnosing a problem.
Hope this helps.
email me at tcarlson41@attbi.com if you have any more questions since I rarely visit this board.
On the other hand, the injectors may be playing into this too. You may have faulty injectors/wiring on one side of the block.
I would try the Bosch O2 sensor first. It was the best $25 or $30 I ever spent when diagnosing a problem.
Hope this helps.
email me at tcarlson41@attbi.com if you have any more questions since I rarely visit this board.
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