With problem after tune.........

**clg82** · 02-20-2009, 05:21 PM

Hey guys well I finally got my car tuned by a profesional tuner and my 3.73 gears installed. He used HP tuners and about half way home on a 2 hour drive I pop my Service Engine Soon light......So I read the codes when I get home and they are p0171 Bank 1-4 "System too lean"... It has a code for all the banks but the car runs and drives fine!! So why is it doing this and could this be a major problem? And how do I fix it?

**clg82** · 02-20-2009, 06:15 PM

Anyone with any suggestions?

**thearborbarber** · 02-20-2009, 07:07 PM

Let me know if cleaning the maf works.

http://www.obd-codes.com/p0171

**egod** · 02-20-2009, 07:27 PM

if it says too lean i would hold off driving it at least. too lean = detonation
IF you can get your hands on a air/fuel meter or a handheld to check, it could just be a bad sensor

**clg82** · 02-20-2009, 07:51 PM

Ok I used maf cleaner on my maf, and reset the codes. If it is not fixed how long until it takes for the Service Engine Soon light come back on? And if I was getting "detonation" wouldn't my car run like "Ass"? It runs like a top...runs great no spittering or sputtering.......anyone with some answers I would appreciate it......

**thearborbarber** · 02-20-2009, 08:02 PM

Mine came back right away after I cleared the codes the first time before cleaning the MAF. The computer retards timing when it detects ping so it would slow somewhat but would be hard to feel. My car ran ok but my milage was down a bit and power was down a bit. Over oiled K&N was root of my evil. Not saying the filter was bad, but I used the theory that is some oil on the filter was good more has to be better wasn't very good.

**clg82** · 02-20-2009, 08:06 PM

Originally Posted by thearborbarber

Mine came back right away after I cleared the codes the first time before cleaning the MAF. The computer retards timing when it detects ping so it would slow somewhat but would be hard to feel. My car ran ok but my milage was down a bit and power was down a bit. Over oiled K&N was root of my evil. Not saying the filter was bad, but I used the theory that is some oil on the filter was good more has to be better wasn't very good.

Well I am going to take it for a drive, and I will come back with the results............

**clg82** · 02-20-2009, 08:34 PM

Ok I am back, and as soon as I pull out of the driveway, the SES light pops again......i heard that is also may be cause by a vacuum leak, and I do remember having a crackin in a tube that I had used electrical tape to seal up below is a pic could this me causing it?........What bugs me the most is it was after the tune........could the tune have something to do with it?

**clg82** · 02-20-2009, 08:35 PM

Originally Posted by egod

if it says too lean i would hold off driving it at least. too lean = detonation
IF you can get your hands on a air/fuel meter or a handheld to check, it could just be a bad sensor

but which sencor?

**egod** · 02-20-2009, 09:16 PM

the one that detects lean conditions

**clg82** · 02-20-2009, 09:18 PM

Originally Posted by egod

the one that detects lean conditions

where is that located? and could that pictures of the tube I posted be causing a vacuum leak?

**JoshieDoom** · 02-20-2009, 09:31 PM

Originally Posted by clg82

where is that located? and could that pictures of the tube I posted be causing a vacuum leak?

That is the 02 sensors.. but the PCV system being unhooked most likely caused it.

Hook it back up, clear the codes and then try it again!

**clg82** · 02-20-2009, 09:38 PM

Originally Posted by JoshieDoom

That is the 02 sensors.. but the PCV system being unhooked most likely caused it.

Hook it back up, clear the codes and then try it again!

Excuse me for the stupidity but what is the PCV system?

**JoshieDoom** · 02-20-2009, 09:41 PM

Originally Posted by clg82

Excuse me for the stupidity but what is the PCV system?

what is in the pic. You are letting unmetered air into your car. Hence the lean condition.

**clg82** · 02-20-2009, 09:45 PM

Originally Posted by JoshieDoom

what is in the pic. You are letting unmetered air into your car. Hence the lean condition.

So you think that is the actual problem....the guy that installed my ls6 intake noticed the crack and taped it with electrical tape.......I haven't had any codes like that since, and now that i got the tune i have these codes are you sure that it isn't the tune that could be causing it.......and if not what is an easy fix for that shitty elbloe looking thing because it is in the long part of the tube and not the actual elbow itself?

**egod** · 02-20-2009, 09:48 PM

Originally Posted by JoshieDoom

what is in the pic. You are letting unmetered air into your car. Hence the lean condition.

That would be it, i didn't understand that part that is was unhooked

**clg82** · 02-20-2009, 09:49 PM

Originally Posted by egod

That would be it, i didn't understand that part that is was unhooked

so you think that is the problem and not the tune........?

**JoshieDoom** · 02-20-2009, 09:49 PM

Originally Posted by clg82

So you think that is the actual problem....the guy that installed my ls6 intake noticed the crack and taped it with electrical tape.......I haven't had any codes like that since, and now that i got the tune i have these codes are you sure that it isn't the tune that could be causing it.......and if not what is an easy fix for that shitty elbloe looking thing because it is in the long part of the tube and not the actual elbow itself?

Well...

http://www.ls1.com/forums/showthread...=complete+redo

**clg82** · 02-20-2009, 09:54 PM

Originally Posted by JoshieDoom

Well...

http://www.ls1.com/forums/showthread...=complete+redo

So you think it's the crack and not the tune......... after I fix this crack and clear the code/codes.......if the SES light comes back on again is it because it wasn't fixed or it takes some time to "relearn" the correct way to run?

**JoshieDoom** · 02-20-2009, 09:58 PM

Originally Posted by clg82

So you think it's the crack and not the tune......... after I fix this crack and clear the code/codes.......if the SES light comes back on again is it because it wasn't fixed or it takes some time to "relearn" the correct way to run?

If the SES light comes back on after you fix the hose, you have other issues.