got a p0171 this morning

[Trevinator]

so this morning, I let my car warm up for about 15 minutes since it was so cold outside (7-8*F), and when I got in it to go, the ultragauge showed a p0171. so i figured maybe the sudden cold weather was causing one of my sensors to be wacky or that the valve cover was the issue.

so when i got to work i popped the hood and checked to see if the valve cover was leaking at the typical spot, but that was ok. so i pulled it in the garage and did a boost leak test later on in the day. i found one of the hose clamps on the new charge piping was loose and leaking air.

i tightened every one i could get to, minus the ones right on the intercooler itself(i didn't want to pull the bumper). that got rid of the code, but the LTFT was still high, bouncing between 10 at idle up to 22 at one point. when it was showing the pending code, the LTFT was up to 33-34 once!

recently it has been about 20-30*F here and the LTFT has been staying around 10-14 like usual.

should i be worried about the LTFT's being that high? could they just be caused by the cold weather here?

 

[bluejay]

too lean on bank one , i know this code very well . i always got it on my mazda . after i did a cold air intake and an exhaust . the code is usually caused by a vacuum leak after the mass air flo sensor . have you mess with intake , filter , throttlebody lately ? u may just have a loose connection somewhere .i also found the code would pop up when the weather gets a little funny , and if u just cleared the code or fixed what was causing the code it will take a bit of driving b4 ur fuel tims go back to normal.

 

[Trevinator]

I did just put the new intercooler and piping on about a month ago or so. like I said, I did have an air leak on the intercooler piping that I fixed by tightening the hose clamp a bit(probably loosened due to the cold weather here, -5*F today). the code hasn't popped back up again, but the LTFT is still in the 17-22 range under partial throttle, even up to 28 once this morning.

the car seems to run good too, no hiccups on startup like before I fixed the piping. I guess i'll just drive it and see if it pops back up.

 

[Natesriv]

Do you have an aftermarket coil cover ? I do (DDM ) the two Allen screws holding it down like to work their way loose .......

 

[Trevinator]

nope, just the stock coil cover.

 

[Trevinator]

now the LTFT is in the negatives at times!!!!!! I saw it as low as -21 tonight on the way home with slight throttle pressure! what is going on? could one of my air sensors be going bad? when I was stopped at home, I gave it a quick blip of the throttle, and it felt like it wanted to die out a bit. the revs dropped below what would be the normal idle when I blipped the throttle and the LTFT was around -18 to -21! but if I give it some gas while im moving, the LTFT is up around +17.

first its lean, now its rich. I don't understand what could be causing this.

tomorrow i'll check again for boost leaks, but im pretty darn sure I got them all!

 

[Victory Red RS]

now the LTFT is in the negatives at times!!!!!! I saw it as low as -21 tonight on the way home with slight throttle pressure! what is going on? could one of my air sensors be going bad? when I was stopped at home, I gave it a quick blip of the throttle, and it felt like it wanted to die out a bit. the revs dropped below what would be the normal idle when I blipped the throttle and the LTFT was around -18 to -21! but if I give it some gas while im moving, the LTFT is up around +17.

first its lean, now its rich. I don't understand what could be causing this.

tomorrow i'll check again for boost leaks, but im pretty darn sure I got them all!

Google Long Term Fuel Trim (LTFT). It's not an instant reading it's an average over a period of time. Read your STFT if you want something a little more real time.

 

[Trevinator]

that's the thing though, the STFT is bouncing around like the LTFT is. I expect the STFT to bounce around a little bit, but the LTFT should not have a 40% swing from the negatives to the positives.

it hasn't popped a code or pending code yet though, which is surprising.

 

[cbutton]

I got that same code p0171 I just did the Diablo sport 93 tune last week and I punched the gas cuz I was checking out how my car was after the tune and my engine light came on did I mess something up on my car lol


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[CDub002]

That same code is my current issue. Dealer is replacing PCV valve. That seems to be pretty common. It is covered under powertrain warranty.

Side note, mine is also getting it's SECOND oil pan gasket, and a new water pump. 80k miles. Cool.

 

[94383Z71]

so when i got to work i popped the hood and checked to see if the valve cover was leaking at the typical spot, but that was ok.

What spot is this, if anybody can share?

My car has been running like arse for a few months now. At first I thought it was the updated Trifecta tune, but A-B-A testing shows otherwise. I found a failed check valve in the PCV pipe, but no change after replacing that. Only after this did I pop a P0171.

I'm going to triple check all of my air inlet connections after work, as well as my PCV pipe install. Any other tips on tracking down just P0171 would be appreciated.

E: Seems this is the valve cover area in reference (threadlink) : http://www.sonicownersforum.com/for.../17423-p0171-valve-cover-troubleshooting.html