Wild.Bl

2013 ATS 2.0T P0171 Solved !!

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I was having an intermittent "Check Engine" light showing P0171. Connected my diagnostic tool and found very high (38+) LTFT at idle that would slowly decrease at higher RPM to (25). Started by checking for vacuum leaks and this is what I found. PVC hoses cracked and brittle (see pictures). Temp fix with duct tape while waiting for a new replacement from AC Delco.

Better already with less fuel consumption! Hope this helps others.

 

 

1807549805_ATSPCVCracks03_07_18.jpg.274e8fe236555128a0657207506a3675.jpg

 

1353847194_ATSPCV03_07_18.jpg.c413aff9f93b86985a817ed78766781b.jpg

Edited by Wild.Bl

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Glad you found the problem but I think some electrical tape would have worked better and looked a lot nicer.  Just throwing out my two-cents (and it's probably not worth that).


Chuck

'17 XT5, '04 Bravada........but still lusting for that '69 Z-28

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Good catch.  Interesting that is a 4 cylinder and the lean code is P0171, but there is only one bank.  Lessons learned everyday.  Maybe on the 2.0 the P0171 doesn't designate any banks, just lean condition.    Let us know how it runs after replacing the pipe. 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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This was my car. Couldn't remember  my login info so had my dad post it.

 

 we found the problem in my parking lot and the only tape I has was the duct tape. Once applied it ran much better. Hasn't set any codes in the last week so the temp fix worked. On my way now to pick up new parts. Will update after.

 

@BodybyFisher you are correct,  the only way we figured it out before looking was looking at my obd2 scanner and a very high LTFT and saw that the manifold pressure was staying steady (really high) with throttle open AND closed. So we knew it was a vacuum leak. The split in one end of the line was so big that using carb clean to find it, it didnt even get an rpm rise. It was only when my (bad) eyes saw it that it all made sense. 

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1 hour ago, davism4 said:

This was my car. Couldn't remember  my login info so had my dad post it.

 

 we found the problem in my parking lot and the only tape I has was the duct tape. Once applied it ran much better. Hasn't set any codes in the last week so the temp fix worked. On my way now to pick up new parts. Will update after.

 

@BodybyFisher you are correct,  the only way we figured it out before looking was looking at my obd2 scanner and a very high LTFT and saw that the manifold pressure was staying steady (really high) with throttle open AND closed. So we knew it was a vacuum leak. The split in one end of the line was so big that using carb clean to find it, it didnt even get an rpm rise. It was only when my (bad) eyes saw it that it all made sense. 

Well that is a good find and good information for other members going forward, so thank you for sharing this here.   Its a shame that a connector like that  j  u  s  t  gets beyond 5 years, this is stuff that GM needs to see and stop from happening going forward, it looks like they are wedded to planned obsolescence.  Now in their defense, this tubing COULD have been damaged during service or physically stressed causing the problem, but if this is becoming a problem and we see this again, I would alert GM. 

While the first owners may keep the car a few years, its the second and third owners experience that will kill a reputation. 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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