Drwinlied
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- Nov 21, 2020
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Hey yall. Trying to track down an issue with my daughter's friend's k1500 (98, 5.7).
She has had a few issues we've sorted thru, but one is persisting. I'm no expert, but I'm trying to help where I can.
Started with P0135, P0154, P0404, P0405.
We addressed all those with new egr and upstream 02s, but then had a P0300 (misfire on 7). I've checked plugs/wires and thru a fresh plug into cylinder 7, but there is still an issue with 02 voltage falling off a cliff for that bank 2 upstream sensor.
We've cleaned the maf, checked for obvious leaks on the intake side, swapped pass/driver upstream sensors to see if it follows a bad sensor, but it doesnt.
There is a slight exhaust leak on the manifold to pipe (donut) that we're going to address, but I cant imagine such a small leak causing this?
I just realized tonight the obd2 live data still reads 0.45v on that bank 2 sensor even when its unplugged. But when its plugged in and running, both sensors start around there and one climbs to .87-.9 while the other drops to 0 and it sounds real unhappy.
For now we are just running without it plugged in but definitely need to fix.
Anything I can easily test or ideas to fix? I can get some screen shots of fuel trims too if needed next time she's over...
Forewarning that electricity is a black art to me (like suspension setups on motorcycles lol).
She has had a few issues we've sorted thru, but one is persisting. I'm no expert, but I'm trying to help where I can.
Started with P0135, P0154, P0404, P0405.
We addressed all those with new egr and upstream 02s, but then had a P0300 (misfire on 7). I've checked plugs/wires and thru a fresh plug into cylinder 7, but there is still an issue with 02 voltage falling off a cliff for that bank 2 upstream sensor.
We've cleaned the maf, checked for obvious leaks on the intake side, swapped pass/driver upstream sensors to see if it follows a bad sensor, but it doesnt.
There is a slight exhaust leak on the manifold to pipe (donut) that we're going to address, but I cant imagine such a small leak causing this?
I just realized tonight the obd2 live data still reads 0.45v on that bank 2 sensor even when its unplugged. But when its plugged in and running, both sensors start around there and one climbs to .87-.9 while the other drops to 0 and it sounds real unhappy.
For now we are just running without it plugged in but definitely need to fix.
Anything I can easily test or ideas to fix? I can get some screen shots of fuel trims too if needed next time she's over...
Forewarning that electricity is a black art to me (like suspension setups on motorcycles lol).
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