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10 Posts
Hi, I've gotten a lot of great info off this sites old threads, but never posted before.
I had "System Too Lean Bank 1&2" codes just as my inspection was coming up. I tried checking for vacuum leaks and cleaned the MAF (with MAF-cleaner), but the code came right back after reset. So I brought it to a shop and after multiple hours diagnosing decided it was the MAF and replaced it for a grand total of $450. I was in a pinch and got it, and had to drive it for a while to see if the codes didn't come back
Now there's "Fuel Trim Bank 1&2" codes that take ~10 min to come up.
Since it came up multiple times I could see the freeze frame data. Both banks at 24% long term positive trim at idle. 800rpm, 0.5 lb/min, 0 mph.
I caught it Freeze frames 3 times since and all were at idle except One. 33 mph, 1800rpm, 2.7 lb/min.
I even tried to highway it right after clearing the codes to see if it would get triggered under load, but it kept popping up with freeze frames that showed idle conditions Even when the code posted while on the highway (I was refreshing continuously)
It's affecting bank 1 and 2, so I'm fairly certain it's not a header leak, injector leak, etc.
I'm lost. a lean idle would almost have to be a vacuum type leak. Bank 1, our rear bank, lead the LTFT in every instance, but by .5-1%. Should I be checking for a vacuum leak there?
I had "System Too Lean Bank 1&2" codes just as my inspection was coming up. I tried checking for vacuum leaks and cleaned the MAF (with MAF-cleaner), but the code came right back after reset. So I brought it to a shop and after multiple hours diagnosing decided it was the MAF and replaced it for a grand total of $450. I was in a pinch and got it, and had to drive it for a while to see if the codes didn't come back
Now there's "Fuel Trim Bank 1&2" codes that take ~10 min to come up.
Since it came up multiple times I could see the freeze frame data. Both banks at 24% long term positive trim at idle. 800rpm, 0.5 lb/min, 0 mph.
I caught it Freeze frames 3 times since and all were at idle except One. 33 mph, 1800rpm, 2.7 lb/min.
I even tried to highway it right after clearing the codes to see if it would get triggered under load, but it kept popping up with freeze frames that showed idle conditions Even when the code posted while on the highway (I was refreshing continuously)
It's affecting bank 1 and 2, so I'm fairly certain it's not a header leak, injector leak, etc.
I'm lost. a lean idle would almost have to be a vacuum type leak. Bank 1, our rear bank, lead the LTFT in every instance, but by .5-1%. Should I be checking for a vacuum leak there?