Tehnation Posted July 30, 2011 Share Posted July 30, 2011 This cel came up today. I searched on forums about it, seems like its a leak maybe. But the car idles fine, drives fine. I couldn't honestly tell the difference. I had unplugged battery to reset it went away. Came back about 20+ miles after I reset. I can see the blue T splitter in between manifold and ic, and it seems fine, checked the hoses I could see, everything looks good. Don't know why its running lean. Can it be fuel filter, dirty injectors maybe? From what I've read if it were a leak then idle would be affected, but car idles fine between 700-900 and is steady at whatever rpm its at. Any thoughts? Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted July 30, 2011 I Donated Too Share Posted July 30, 2011 This code came up on my car 3 weeks ago... it had blown off one small vacuum hose... car idled just fine, did not act like a hose was off but I sprayed starter fluid in different areas until the idle picked up - then I zero'd in and found it. It can also be a dirty MAF but go looking for the hose... I spotted mine, not by looking for a 'hose' but where a hose could be attached and isn't - a very shiny and clean tube end is what I saw... below it the hose that should have been on it! Link to comment Share on other sites More sharing options...
Tehnation Posted July 30, 2011 Author Share Posted July 30, 2011 Where? Link to comment Share on other sites More sharing options...
MeoW71 Posted July 31, 2011 Share Posted July 31, 2011 Where? Driver side. I had the same problem with the code. Apparently the hose had blown off the below nipple. It goes to the fuel pressure regulator if I remember correctly. It was pretty obvious when I boosted since I'd get that nice blahhhh sound as air wooshed out of it. http://i103.photobucket.com/albums/m133/rexwagon/IMG00033-20100423-1339.jpg Link to comment Share on other sites More sharing options...
Tehnation Posted July 31, 2011 Author Share Posted July 31, 2011 Funny, I looked at that one before and it was on, just lose, the end of hose seemed a little brittle. Not a very snug fit. Gonna check it out tomorrow when I have light out. Thanks for that picture! Link to comment Share on other sites More sharing options...
bmx045 Posted July 31, 2011 Share Posted July 31, 2011 That tube connects to the fuel pressure regulator. Yeah. You need that connected at all times. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Tehnation Posted July 31, 2011 Author Share Posted July 31, 2011 Its connected! Just not as snug as it should be, going to get one of those things, that does that thing. Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted July 31, 2011 I Donated Too Share Posted July 31, 2011 This is where my vacuum hose came off of... It wasn't obvious as the hose had dropped down but the end of the metal tube was what I finally noticed. http://www.sigmafour.net/lgt/vacuumhose1.jpg Link to comment Share on other sites More sharing options...
Tehnation Posted August 1, 2011 Author Share Posted August 1, 2011 bleh. I looked in manual says with that code I should test rear o2 sensor. Link to comment Share on other sites More sharing options...
evil03mustang Posted February 17, 2014 Share Posted February 17, 2014 Yeah, this. Contact cement and zip ties. Never again. NEVER AGAIN!!!!! Link to comment Share on other sites More sharing options...
Robs Sleeper Posted February 28, 2014 Share Posted February 28, 2014 +1 for a vacuum leak. I threw code P0171 yesterday, and there was no question that something was wrong with the car. The idle was quite rough, and was surging up a couple hundred RPM every 5-10 seconds. I got lucky, and the first vacuum tube I looked at was the culprit: my bypass valve hose had come apart. My MAF was also filthy (thanks K&N). After cleaning the MAF, and replacing the hose (which involved removing the intercooler) all is well. I don't think that the MAF was likely the root of the CEL, but I'm pretty sure that the car was down on power as a result of the black layer over it. My car is much more "perky" than she used to be too Link to comment Share on other sites More sharing options...
Tehnation Posted February 28, 2014 Author Share Posted February 28, 2014 Mine was a MAF issue. Link to comment Share on other sites More sharing options...
Robs Sleeper Posted March 1, 2014 Share Posted March 1, 2014 It is interesting that the factory service manual tells you it's the O2 sensor, and gives nothing else to follow up on. Then it turns out it's a vacuum hose. Or a MAF. Or a fuel pressure regulator. Or a... Link to comment Share on other sites More sharing options...
GipsySpec.B Posted March 10, 2014 Share Posted March 10, 2014 I just had this same issue, going to double check hoses and clean MAF. I have a rough idle sometimes, not always but like 70% of the idle time. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
GipsySpec.B Posted March 17, 2014 Share Posted March 17, 2014 I cleaned the MAF sensor and filter,! It worked for 3 days then popped again so I have up and tore the girl open at a co-workers shop. Cracked vacuum hose. 2 hours later and she's all betterz Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
R32 Posted October 31, 2014 Share Posted October 31, 2014 Pulled same code. Had vacuum hoses replaced. Code keeps popping back on every 50-90 miles after clearing the code. So, since the hoses are replaced, I'm guessing clean the MAF, air filter, and rear O2 sensor? Link to comment Share on other sites More sharing options...
Max Capacity Posted October 31, 2014 Share Posted October 31, 2014 FWIW, the front O2 sensor is used to meter fuel flow. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
MAP Posted October 31, 2014 Share Posted October 31, 2014 Try putting 2 bottles of technron fuel system cleaner in the tank at next fill up. Dirty fuel injectors will set the code. This took care of my problem 3 weeks ago or.. Link to comment Share on other sites More sharing options...
spec.B452 Posted November 2, 2014 Share Posted November 2, 2014 Check your turbo inlet at the turbo, they tend to degrade and tear over time. Link to comment Share on other sites More sharing options...
Markbo Posted November 20, 2014 Share Posted November 20, 2014 That code is specific to bank 1 lean. Why FPR, downstream O2, MAF & random hoses when it should be specific to the passenger side? Link to comment Share on other sites More sharing options...
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