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Yeah I didn’t think my pcm went to a 30 value either, it just might be my scan tool, not sure. I did have these issues before I started to work on the van. Actually when I bought it 2 years ago it had this issue but it went away. Now it seems to be back to stay. My scan tool does not show pulse width, sorry.
Yeah I didn’t think my pcm went to a 30 value either, it just might be my scan tool, not sure. I did have these issues before I started to work on the van. Actually when I bought it 2 years ago it had this issue but it went away. Now it seems to be back to stay. My scan tool does not show pulse width, sorry.
I will check it out regardless. I’ve tried just about everything else I think would effect the fuel trim. Although on my scanner the Maf seems to read alright and smooth readings with throttle response. I may just have to break down and take it to the shop. It’s hard to take it there after investing so much time, research and money into the problem haha 🙂
I will check it out regardless. I’ve tried just about everything else I think would effect the fuel trim. Although on my scanner the Maf seems to read alright and smooth readings with throttle response. I may just have to break down and take it to the shop. It’s hard to take it there after investing so much time, research and money into the problem haha 🙂
It still ran like crap. I tested the mass air flow sensor when this started happening months ago. I think I may try cleaning it anyways. One question reason I never really suspected it is because I figured it would effect the overall engine performance and not just one bank of the engine.
It still ran like crap. I tested the mass air flow sensor when this started happening months ago. I think I may try cleaning it anyways. One question reason I never really suspected it is because I figured it would effect the overall engine performance and not just one bank of the engine.
Haha…yeah me and you both. The only sensor that is biased from one side of the engine to the other is the o2 sensors. But the pcm is seeing that is needs more fuel yet is cutting it. It is a unique problem. I will check the connections again tomorrow. I had unplugged the connectors before and checked and they looked nice and clean but who knows. I’m leaning towards that the pcm is not bad as this is not normally what a bad pcm would do.
Haha…yeah me and you both. The only sensor that is biased from one side of the engine to the other is the o2 sensors. But the pcm is seeing that is needs more fuel yet is cutting it. It is a unique problem. I will check the connections again tomorrow. I had unplugged the connectors before and checked and they looked nice and clean but who knows. I’m leaning towards that the pcm is not bad as this is not normally what a bad pcm would do.
That I have done several times 🙂 Once when I started it the fuel trim went to -30.5 without even going into closed loop. I even went as far as to pull the connector off the o2 sensor on bank 1 and plugged it into the o2 sensor on bank 2 which was the good side of the engine and it still dropped to -30.5/
That I have done several times 🙂 Once when I started it the fuel trim went to -30.5 without even going into closed loop. I even went as far as to pull the connector off the o2 sensor on bank 1 and plugged it into the o2 sensor on bank 2 which was the good side of the engine and it still dropped to -30.5/
No codes or check engine light. The voltages on bank 1 sensor 1 fluctuate between .150 to .300 volts while short term fuel trim is at -30.5. To me the o2 sensor is telling the pcm that is too lean and should be adding fuel, not taking it away.
No codes or check engine light. The voltages on bank 1 sensor 1 fluctuate between .150 to .300 volts while short term fuel trim is at -30.5. To me the o2 sensor is telling the pcm that is too lean and should be adding fuel, not taking it away.
Here’s a link that should answer your question.
http://www.justanswer.com/chevy/72dla-need-replace-valve-cover-gasket-2001-cavalier-2-4l.html
Here’s a link that should answer your question.
http://www.justanswer.com/chevy/72dla-need-replace-valve-cover-gasket-2001-cavalier-2-4l.html