- This topic has 2 replies, 2 voices, and was last updated 5 years, 2 months ago by .
-
Topic
-
Hi folks,
I’ve been following suggestions on this forum and eric’s youtube channel, which are helpful and helped me fix issues of my car. This time I’ve got a unique issue that I don’t how to diagnose further and would like to hear your advice.
The check engine light turned on a few days after my father bought this pilot. The car has 110k on it and drives great, so I’m planning to fix it. Please see below the diagnosis I did so far:
* The scanner showed that misfire only occurred during cold start, about 30 to 60 misfires events per cylinder, depending on the temperature. I barely see any misfire during warm start or normal drive.
* I’ve changed spark plugs and the clogged pcv valve, but there was not improvement.
* The car showed no misfire or lack of power with load, so it doesn’t seem like fuel related issue
* The LTFT is 5% and 1% for each bank. STFT is almost always 15% for bank1 (0% for bank2). When I step on the gas, STFT for bank1 drops to a little to 10%. So it seems like a lean condition and there might be some vacuum leak. I’ve checked that MAP sensor reported 8.5 inch vacuum, which looks normal. This part confuses me the most.
* The previous owner said that he saw the same issue before. He also said that the issue went away when he switched to octane 89.
* I observed the same misfire even when the battery was hooked to a battery charger, so it doesn’t seem like a battery issue.
* Engine oil and coolant levels look stable and their colors also look good. I didn’t see colored smoke from tailpipe either.Based on the info from this forum and on youtube, valve adjustment seems like the next step (also a major task for weekends). I wonder if there is anything else I should check before opening up the engine?
Thanks a lot for reading through this long list and really appreciate your advice
Yan
- You must be logged in to reply to this topic.