Quote:
Originally Posted by bmwlover0725
Thank you for the response! The code was 00274A through ISTA. I'm not sure how to do freeze frame through it though so I'll have to figure that out. I'm only guessing fuel injector because of the harder start perhaps thinking that it may have fouled my plugs badly, but I'd assume it would always run rough then.
Vacuum I'm guessing not especially because idle is completely fine. It jumps a bit for 2-3 seconds after the hard start and that's it. It's perfectly smooth after that.
There are also no running issues. The reason I doubt it's an O2 sensor aside from already having done two new ones is that all of the monitors initially set and then it fails a while later. It's inspectable initially which I guess is good, but I definitely want to get this fixed. Perhaps I should look to a vacuum leak, but then why would it only be on one side?
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So one important piece of information you left out - when did the O2 problems start relative to the hard start problem?
Also, who did the O2 sensor replacements? Was the joint between exhaust header and catalytic converter disturbed during that process?
Here's something you can do right now - get under the car and look very carefully at the joint between the exhaust headers and the catalytic converter for bank 1 (passenger side). See if there is any carbon residue or other signs that might be interpreted as a leak. If you're uncertain, compare it to the driver side where sensor function seems to be normal. It doesn't take much of a leak to cause a problem.