kevin kietzman Posted February 8, 2017 Report Share Posted February 8, 2017 I keep getting p0171 and p0174 i can reset them and go for awhile but comes back running lean on bank one any suggestions on causes of this besides the mass flow sensor being dirty Quote Link to comment Share on other sites More sharing options...
mhr1961 Posted February 8, 2017 Report Share Posted February 8, 2017 (edited) Common Problems That Trigger the P0171 and P0174 Code PCM software needs to be updated Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.) Mass Airflow Sensor (MAF) Plugged Fuel Filter or weak Fuel Pump Plugged or dirty Fuel Injectors Common Misdiagnosis Oxygen Sensors Edited February 8, 2017 by mhr1961 Quote Link to comment Share on other sites More sharing options...
kevin kietzman Posted February 12, 2017 Author Report Share Posted February 12, 2017 Had a friend check it at his garage on his machine no leaks everything Che key out to spec came on the next day. The only other thing it be is the k&n air filter. How do you update the pcm Software Quote Link to comment Share on other sites More sharing options...
MarcSpaz Posted February 12, 2017 Report Share Posted February 12, 2017 Just changing the air filter should not cause that issue. Modern cars have adaptive tuning, allowing the computer to optimize for changes in air density, temps, etc. I would start with re-seating all the fuel injector connectors and possibly cleaning the injectors. Spray the MAF with cleaner and clean the TB too. How many miles on it? Any mods? Quote Link to comment Share on other sites More sharing options...
mhr1961 Posted February 12, 2017 Report Share Posted February 12, 2017 Just changing the air filter should not cause that issue. Modern cars have adaptive tuning, allowing the computer to optimize for changes in air density, temps, etc. I would start with re-seating all the fuel injector connectors and possibly cleaning the injectors. Spray the MAF with cleaner and clean the TB too. How many miles on it? Any mods? Changing filters can indeed make your car throw codes. K&N even has a technical article about it and how to diagnose what is going on. They also advise you to call them for assistance if your car keeps throwing codes. http://www.knfilters.com/check_engine_light.htm Quote Link to comment Share on other sites More sharing options...
MarcSpaz Posted February 12, 2017 Report Share Posted February 12, 2017 LOL.... the very first line on the site you linked says almost the exact same thing I did. "A properly installed K&N product should not cause the Service Light to illuminate." I'm glad they have a self-service portal and customer service for their customer though. That's a plus. Quote Link to comment Share on other sites More sharing options...
mhr1961 Posted February 12, 2017 Report Share Posted February 12, 2017 Do you really think they would come right out and say that it would throw codes? Tech articles are typically smoked over by a lawyer before they are posted and start off with disclaimers like that. Quote Link to comment Share on other sites More sharing options...
Coondog Posted February 12, 2017 Report Share Posted February 12, 2017 Hi guys..I too am have the same issues..But i installed cmdp and gt500 TB and a JLT # 3 cal..with a bama tune..I cant keep the car running or I have a high idle at a stop and then it settles down only to go back up when i take off and i get codes p0171 & p0174..reloaded the tune and now its just the 174..I have no vac leaks and i check all hoses all's good there..I clear the codes and drive the car ..no check engine light... turn car off wait a few min's start the car and with in a min or so the codes come back...I'm going to call bama tune to send me a new tune and i'll see what happens then..Any thoughts on the problem. Quote Link to comment Share on other sites More sharing options...
kevin kietzman Posted February 17, 2017 Author Report Share Posted February 17, 2017 Cleaned the filter and mass flow sensor and havent had any more issues. My idle also was running high and all i did was was unhook the negative side of the battery for ten minuets and it is running great! thanks for all the replies.. Quote Link to comment Share on other sites More sharing options...
kevin kietzman Posted February 17, 2017 Author Report Share Posted February 17, 2017 i have 42000 miles no mods on it Quote Link to comment Share on other sites More sharing options...
Limitless1 Posted March 4, 2017 Report Share Posted March 4, 2017 (edited) my codes are worst. P. 0010 0020 0102 1135 0141 0155 0161 0443 0446 The car sat for 8 years. last year it flooded just enough to get water onto the floor. otherwise it runs fine still. 11k miles. only. Do you think it could be just a grounding issue OR perhaps the computer? I changed all the 02's and still the 02's show up on the code reader. Edited March 4, 2017 by Limitless1 Quote Link to comment Share on other sites More sharing options...
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