The symptoms started after a collision, but I don't think they are related because it wasn't a big hit. Damage was limited to the passenger side with the headlight busted out and the hood pushed back along with the hood mount bracket.
The issues started with the vehicle stalling a couple of times, while driving it at lower speeds. The following error codes popped up.
P0171
P0300
P0302
P0304
Indicating a lean condition and misfires on cylinder two and four
The following has been done:
MAF - ODB live data looks ok. I tested by checking the value at idle and then doubling the revs and the sensor showed double value. I also cleaned it with MAF cleaner
Air filter, plugs and coils have been replaced
O2 sensor appears to be OK based on the live data
Fuel pump hasn't been tested
I swapped the injectors around and then started getting a misfire on cylinder three, which suggested it was the injectors. I tried replacing them and still get P0171 and P0304. Don't read too much into P0302 missing because it has been inconsistent overall, and I may not have driven far enough for that one to pop up
I haven't performed a compression test or a smoke test to check the intake and vacuum hoses
My thought is this is probably not due to anything like the O2 sensor, fuel pump, or a vacuum leak because that should affect all cylinders equally. Maybe I'm wrong on this?
The only thoughts I have is to check the compression and maybe try a different set of injectors since it's possible the ones I tried weren't any good. And a smoke test if that doesn't prove anything.
I look forward to your input.
The issues started with the vehicle stalling a couple of times, while driving it at lower speeds. The following error codes popped up.
P0171
P0300
P0302
P0304
Indicating a lean condition and misfires on cylinder two and four
The following has been done:
MAF - ODB live data looks ok. I tested by checking the value at idle and then doubling the revs and the sensor showed double value. I also cleaned it with MAF cleaner
Air filter, plugs and coils have been replaced
O2 sensor appears to be OK based on the live data
Fuel pump hasn't been tested
I swapped the injectors around and then started getting a misfire on cylinder three, which suggested it was the injectors. I tried replacing them and still get P0171 and P0304. Don't read too much into P0302 missing because it has been inconsistent overall, and I may not have driven far enough for that one to pop up
I haven't performed a compression test or a smoke test to check the intake and vacuum hoses
My thought is this is probably not due to anything like the O2 sensor, fuel pump, or a vacuum leak because that should affect all cylinders equally. Maybe I'm wrong on this?
The only thoughts I have is to check the compression and maybe try a different set of injectors since it's possible the ones I tried weren't any good. And a smoke test if that doesn't prove anything.
I look forward to your input.
Dec 14, 2024 at 5:43 PM
