P0172 and P2BF0

[SheepDog]

Good morning fellow FI enthusiasts. Went for a drive yesterday and about 20 minutes in, I got both of these codes. P0172 and P2BF0. I'm putting this in the Forced induction forum because it seems that a few others with Superchargers, E85 or at least aftermarket injectors have had these codes come up.

My fuel trims are spot on, no misfires, MAF data looks good, fuel pressure is solid. The car seems to be running just fine.

It seems odd to get both a lean and rich code for the same bank, and I did find a couple other posts in here (and one in an F150 forum-whipple'd 5.0) But didn't seem that anyone had a definitive resolution. Just thought I would check and see if anyone else had this issue, before I go taking things apart, cleaning injectors replacing O2's etc.

Thanks

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[SheepDog]

No one else? I guess it's time to go hunting. I think I'll start with cleaning and backflushing the injectors. Seems like others pointed in this direction.

 

[Pistol_91]

Haven't had this issue but id suspect bad O2s. Are they old?

 

[Nobuemon]

Someone on the F150 forum mentioned that it could be injector(s) spraying too much fuel at idle and giving you the code. I drives fine because it need that much fuel for driving but chokes on idle.

 

[Pistol_91]

Someone on the F150 forum mentioned that it could be injector(s) spraying too much fuel at idle and giving you the code. I drives fine because it need that much fuel for driving but chokes on idle.

If that's the case, injector data may be skewed a little. OP anything new on the car lately?

 

[SheepDog]

If that's the case, injector data may be skewed a little. OP anything new on the car lately?

No nothing new. The Injectors have maybe 4,000 miles on them. I have had the fuel system open several times to reroute some fuel lines, so I thought maybe I contaminated the system and one or more of the injectors was boogered up. The Car seems to run just fine, but I have noticed a few hard starts recently. The 02 sensors are original (8,800 miles, maybe 5000 miles of FI and E85)

 

[SheepDog]

Someone on the F150 forum mentioned that it could be injector(s) spraying too much fuel at idle and giving you the code. I drives fine because it need that much fuel for driving but chokes on idle.

Yeah I saw that post too, however this only came up last weekend. Prior to this event I never got these codes and have been running the same tune and injectors for about 4000 miles or so. I may send a fresh log over to Wengerd and see what he thinks, just to be sure

 

[SheepDog]

Welp, after 6 months, the codes came back today. Car runs great. Now Im thinking it may have something to do with ethanol content. I usually fill up at the Alta convenience stores around here, that have pretty consistent E75 (we never get true E85 here in CO) but yesterday and today I filled up twice at the Maverick station nearest me, and they only have E67 according to my content analyzer.

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