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Hi guys I’m new to forum but not to Eric works. Since he always say come to forum to ask question here we go I have what I call a stuff one..In order for you to understand better let me start from the beginning. I have a 05 accord 4 cyl, in 2010 engine light started coming up intermittently(car was still under warranty). I took to the dealer at the time I didn’t know much about car just how to change oil. So they came back saying car is running too lean P0171, that I probably had bad gas. They recommended doing a throttle body clean up and using better gas. Well issue persisted I went back to dealer. They ran all sort of test on map/maf sensor …fuel pressure etc. everything came back green. So since car was under warranty they were going to replace my fuel injectors all 4. I say no problem. They got replace and also did valve adjustment. same issue. I went back and they call Honda. Honda recommend them taking my tank off and cleaning and changing my fuel lines. At this point I was more at the dealer than at work. So warranty was almost over so I just gave up..No warranty means every times my car broke I had to take a lot of money out of my pocket to fix my car. So that when I decided to become DIY. Got myself service manual and found a lot of video on youtube ….So in 2011 I had some money to spare on parts. so after reading all sort of thing online I decided to change my MAP, MAF, O2s all oem..Sadly same issue…Just a little note I forgot to mention this p0171 came up usually between the months of late sep to April. Rest of the year no engine light….So I continue with my quest. WHILE checking vacuum line and other thing. I found two issues, one was the motor mount vacuum was off and also found a rip on the air tube. fix both issue I was so excited same issue..So I decided to get myself the honda HIM. Best investment ever made. With this I was able to verified all part I have previously replace they were working ok.and with this I also confirm most of the time although I may not have an engine light I’m running lean. So last year I continue my quest to find the issue with this car. I replace all intake manifold gaskets also exhaust gasket no improvement. Lastly since it was just like 30 dollars I decided to replace my fuel filter and regulator which is part of the fuel pump assembly same issue here..Then one day I decided to pinch the line for the evap canister valve. My short term went from 10 to 0. I try that a few times. It was persistent results. So I thought I had found my issue. So I replace my valve same issue…At this point of course I want to give up but I just can’t give up. After monitoring some reading this what I notice. In the morning the car short term and long term are beautiful as the day progress it get worse. (I do a lot of stop and go I make about 10 different stop at day) Also I notice sometimes I open my fuel cap the short term goes to 0 but this doesn’t always give the same results.. Any advice sorry the short story..
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DTC Codes – P0100-P0199 – Fuel and Air Metering
You forgot to check the rubber hose, mass air flow, crack and orhter stuff according to this websit : http://www.obd-codes.com/p0171. You can also monitor your fuel consumptionClick here to see the tool whit a tool :[video]http://www.youtube.com/watch?v=9CPqbaSgcok[/video]
[video]http://www.youtube.com/watch?v=iR18rCvsKlY[/video]
hey thank for replying this was one of the first thing I did. To be honest with you everytime I work on the car I always double check the hoses for crack etc. I even one time took it for smoke test nothing brother..no leak. IAC was also replace because it went bad.
You need to check an open exhaust and intake valve by using a air compressor and a tool. Whit a slight open valve caused dirty cylinder after combustion and whit built up carbon residue gunk. Probably cause by the benzene use in Gaz to have a uniform explosion instead using led. To avoid all this carbon build up, you might use regularly Lucas injector cleaner and Lucas cylinder lubrication that have also an injector cleaner.
[video]http://www.youtube.com/watch?v=IzXeeCiSL7k[/video]
So this video bellow show you how to can diagnose this problem
[video]http://www.youtube.com/watch?v=WgrfT0LFMhc[/video][video]http://www.youtube.com/watch?v=hUzOTnsWImI[/video]
I would search for vacuum leaks.do you have a scanner to
read live data? what are the fuel trims and the o2 sensor
switching rapidly.Thank you for replying. Like I mention I have a honda HDS software which what dealer uses. Also I have scan xl program. Trim level at morning are like Short term about 3 and LTF 2 as the day progresses these level going down the hill. By noon it would read like STF 10 LTF 11.. by the end of the day sometimes I may get the P0171 and sometimes what I notice they go back down.. I don’t have a vacuum leak because those level stay the same at idle and at load. What I don’t understand is why when I open by gas cap STF goes from example a 8 to 0(Results varies)
You have an increase fuel pressure when the temperature is hight and a low fuel pressure when the temperature is down. Pressure in the gas thank varies along the temperature. It’s normal. What is not normal is the gas pressure taken after the gas filter. So I conclude whit out know doubt is the fuel pump assembly that hold the fuel pressure regulator. You need to change the fuel pressure regulator.
My source link
http://sebringfuelsystems.weebly.com/fuel-delivery.htmlThanks college man for your time. I will take a look this weekend at the hoses between my evap canister and tank that’s the only thing I haven’t never check in this car.
Honestly I don’t think the gas cap has anything to do with the issue. I think you should focus on the lean condition. If there is an exhaust leak it can also cause the O2 sensor to read lean so if you have any exhaust leaks be sure to address those. In addition, if there are any air leaks in the hose that runs between the MAF sensor and the engine this can cause false readings. Look for the simple things, don’t overcomplicate it. Lean codes are often the result of vacuum leaks, you say you checked for them, how? If you didn’t use the method in the video then you might have missed something. It doesnt’ have to be a hose that’s off, it can also be a leaking gasket. Keep us posted on your progress.
[quote=”elgiro15″ post=49628]hey thank for replying this was one of the first thing I did. To be honest with you everytime I work on the car I always double check the hoses for crack etc. I even one time took it for smoke test nothing brother..no leak. IAC was also replace because it went bad.[/quote]
What’s an IAC?
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