Oft Tune E85 Showing Codes P1170 P117B
 

EDIT: Thread title is wrong. I believe the codes were 0171 too lean and 117B direct injection. NOT 1170 port injection.

I have had oft headers and e85 for almost a year now. Today car threw check engine codes P0171 P117B. I reset the codes, and I did a wot pull from 3k to 4.5k and the afr was good, mid 12s, and LT trim was around 7%, but then adv mult dropped to 0.0. Ignition adv is in the 40s. I recorded it and will post the log soon.

I'm going to make another log on the way home. Which parameters should I be logging? Should I try another wot pull? Any ideas? The car sounds and idles fine.

Thanks a lot for any help. @Shiv@Openflash @steve99 @mad_sb

Don't tell me direct injection failed. The codes are for too lean and Direct Injector Fuel Performance.

I would not be doing WOT high rpm runs till you find out what wrong.

Check for intake air leaks, maf sensor dirty especially if you have aftermarket intake or an oiled filter.

Check for exhaust leaks, and 02 sensor plugs or maf sensor plugs all good.

do a log and look for high ltft, the IAM being at zero indicates significant knock occurring, check if commanded afr and afr are following each other under load.

probably look at direct injector pulse width and port injector pulse width.


http://www.ft86speedfactory.com/ecutek/DTCList.pdf

Command afr and afr are following each otherr partial and wot. LTFT are high 30s when partial throttle but 5% wot. Stock intake and toyota drop in filter.

What's the easiest way to check for intake leaks and the sensor plugs? My tools/garage are 150 miles away at another house. Should I hit up a local mechanic? Dealer is out of the question.

Can I do wot lower than 5k logs?

Thanks again, Steve.

LTFT high 30 is no good something is wrong.

try logging the direct and port injection pulse widths see if one stays zero all the time at medium rpm and load it runs some port and some direct injection

P1170
Port Injector Fuel Performance Does not come on DTC

P117B
Direct Injector Fuel Performance Does not come on DTC


P0171
System Too Lean (Bank 1)


Seems unlikely both injection systems would fail at same time

likely its going to be something common to both

fuel tank low empty
fuel pressure low fuel pump failing.
maf sensor issue
air leak ect

this guy got same codes after installing k&n intake ,

http://www.ft86club.com/forums/showthread.php?p=1618213

pull out filter and maf sensor check maf sensor clean and no debris or anything in it. One guy had a mouse eat through his air filter and the bits of filter clogged maf sensor.

http://www.datazap.me/u/gonzo/di-and...s?log=0&data=1

Only went WOT for about two seconds. Does anything look off? I'll check the filter tomorrow and make another log.

STOP whatever you're doing and go back to a stock or trusted ROM. Your fuel trims are so out of whack. If you're under warranty get that car in asap. Otherwise, you will have to test the injectors and fueling system for integrity. Something is very wrong

Thanks. Already back to a 91 map. I was thinking that maybe the e85 pump gave me 91 gas instead of e85. I'll log the 91 and see what happens.

If you're running 91 on an E85 tune your fuel trims will be super high 20+ as shown in your log. That would be the most logical conclusion.

However I wouldn't understand how you mistaken E85 for 91.

I don't. The island is on the opposite side of the station. I was thinking the gas station fucked up.

Went back to 91 and haven't thrown any codes. After 20 miles, my LTFT during partial throttle is 10-17% below 4500 rpm and then 3% above 4500 rpm (partial throttle). I didn't do any WOT pulls. I'll do some tomorrow and log it.

The good news: no codes, IAM stays at 1

Bad news: LTFT is 10-20% in the lower rpms, but drops below 5% in higher rpms.

sounds like its back to intake\ exhaust leak crook\ dirty maf sensor or 02 sensor.

Turns out it was a dying battery o_o

Car wouldn't start a week after these codes started. Replaced it and no more codes & LTFT is back to normal.

sounds reasonable if voltages not stable weird stuff is going to happen.

I'm having the same two codes pop up, I'm completely stock aside from a cat-back. I noticed my LTFT is in the high 30s at idle as well. I'm taking her into my buddy's shop tomorrow so he can take a look. My question; Has this problem showed up anymore since you've replaced the battery?

Wow how creepy that you asked. Just a few hours ago popped P0171 for the first time since my original post. Looks like (and sounds) like a leak at the headers. Going to tighten them down and pray I don't need to swap the gasket :(

Fuel trims are high at idle and engine braking (20%) and the O2 sensor reads super high voltages when engine braking (dunno if that's normal but doubt it). Everything is normal when cruising and accelerating. Also, the car sounds really loud when you're sitting inside. I feel like this is all pointing to an exhaust leak that has been getting worse over time. I think that if the o2 sensor was dirty/bad I'd see high trims while cruising too, right?

I'll let u know what happens.

What are the trims while cruising and accelerating from low rpms?

LTFT appears to be between 30% and 40%. From what I can tell, during moderate acceleration, It barely dips. I didn't go WOT, but when I went slightly above 50% throttle, it dropped down around 10%.

Sorry to hear about that. I'm still trying to wrap my head around this whole concept. ECU programing has always seemed to confuse me.

if your seeing 30%-40% ltft something is definitly wrong\broken\leaking ect that level of trim is the limit of the ecu ability to try to correct afr imbalance between what the ecu is asking for and what its seeing from the 02 sensor.

get it sorted asap before it causes other issues.

That is the plan. I've arranged for rides until I can get my car to the dealer.

Someone I've spoken with suggested the fuel I filled up with last week (which isn't my normal fueling station) could be the culprit, or at least exaggerating the problem. In your opinion, how likely is this to be the case?

Bad batch of fuel or low octane fuel usually results in knock and some hesitation as ecu pulls timing to manage knock.

but unless yo fueled up with E85 by mistake you should not see fuel trims ltft of 30% plus

There's definitely hesitation and I'll admit that's it's been some time since I've really listened under the hood carefully, but it does seem louder and almost a muffled type of knocking that didn't sound like anything I've experienced. I know it's not unheard of that a tanker is filled with the wrong product and nobody catches it until after the fact. Lots of variables in that theory and I realize it's a bit of a stretch. Tuesday I'll be dropping the car off at the dealership.

Steve, around what voltage should the o2 sensor be reading when there's 0% throttle and in gear (engine braking)? Mine is over 4.2v, which doesn't make sense so that's why I'm thinking my headers are leaking now.

Try putting it in neutral and holding it at 1500, 2000, 2500, and 3000 rpm. I read that if your positive fuel trim starts going down closer to 0 then it's a vacuum leak on the intake side. Mine would go down from 20% to about 15% so I figure it's not a leak.

http://www.easterncatalytic.com/educ...agnostic-tool/

look at the front O2 sensor scaling in your tune you should be seeing about 0v at idle as this corresponds to afr of 14.7, it may vary around slightly especially on cold start.

http://www.ft86club.com/forums/attac...1&d=1424688932

look at the front O2 sensor scaling in your tune you should be seeing about at idle as this corresponds to afr of 14.7, it may vary around slightly especially on cold start.

you be better just looking at the AFR

http://www.ft86club.com/forums/attac...1&d=1424688932

look at the front O2 sensor scaling in your tune you should be seeing about at idle as this corresponds to afr of 14.7, it may vary around slightly especially on cold start.

on engine braking the AFR will go full lean like 20 as the injectors are shut off to save fuel

you be better just looking at the AFR

your tune may have 02 sensor scaled differently

http://www.ft86club.com/forums/attac...1&d=1424688932

I didn't think about the scaling being different. Mine is shifted to the right (goes from -.76 to .58) and I forgot that the car would read more air since the injectors are off :lol:

I'm going to get under the car on Saturday and look for a leak. If it isn't that I'll clean the MAF and o2 sensors. If it isn't that I'll get a vacuum test. If it isn't that I'm going to go crazy.

I tried this yesterday, fuel trim holds. So, I guess we can rule out that vacuum leak.