Microtuner...code P0171
Thread Starter
|
Member
Joined: Jun 2001
Posts: 55
Likes: 0
From: Duluth, GA
Microtuner...code P0171
I have 2002 Harley Davidson that I installed a Superchips microtuner on and now I'm throwing a P0171 code (lean bank 1). I installed the performance tune and have gotten this code twice now. I have no mods other than the tune.
Any ideas why it is now giving me this code? I got the first code about 100 miles after the install, cleared the code and about 100 or so miles later I got it again. I did clean the MAF today I hope that might be it. Any other ideas?
I'm just wondering why now.
Thanks
Any ideas why it is now giving me this code? I got the first code about 100 miles after the install, cleared the code and about 100 or so miles later I got it again. I did clean the MAF today I hope that might be it. Any other ideas?
I'm just wondering why now.
Thanks
Senior Member
Joined: Jan 2001
Posts: 124
Likes: 0
From: LaGrange, Kentucky
1MK,
I would bet you caused a vacuum leak with the extra power the engine is producing. Try this: get some starter fluid and spray around all the vacuum lines and around the intake manifold gasket and see if you get a surge. This will tell you are drawing in unmetered air. I hope this helps.
runnert
I would bet you caused a vacuum leak with the extra power the engine is producing. Try this: get some starter fluid and spray around all the vacuum lines and around the intake manifold gasket and see if you get a surge. This will tell you are drawing in unmetered air. I hope this helps.
runnert
Senior Member
Joined: Sep 2004
Posts: 380
Likes: 0
From: MO
I had the same code awhile back. Can't remember if was bank 1 or 2 running lean or something else. Do a search for that code and it should come up cause I posted what the codes that I had meant. Just reread your post. It had something to do with my airaid intake that I installed. Got a new tube and codes were gone.
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
Nobody can just "tell you why" your truck is throwing that code - That would require magic - or maybe a lucky guess.
Finding out why that code is being thrown requires **proper diagnosis.**
You *might* have had a dirty MAF, they do need to be cleaned every year or two, though that must be done very carefully, by using electrical contact cleaner that will NOT attack plastic, and spraying it on the hot wire - then letting it sit for a couple of hours, and then reinstalling it - don't touch the MAF wires, and make sure you disconnect the battery before touching the MAF or it's wiring harness connector. The MAF is one of the most important parts on that entire vehicle - next to say, the brakes or the steering wheel, the MAF is probably THE single most important part, as it is the powertrain's load signal. It tells the PCM exactly how much air (volume & density) is entering the engine, which dictates things like the Air/Fuel ratios, and also affects things like engine timing and even shift points in the transmission.
All we can suggest for now is basic stuff - like making sure the MAF wasn't put back on backwards (it has an arrow molded into the barrel to show correct airflow direction), and that it has NOT been rotated from it's original orientation. In other words, make sure the electronic module where you plug in it's wiring harness connector is in the exact same orientation that it was when the vehicle was bone-stock - make sure it has not been rotated 180 degrees, or 90 degrees, etc, as that can affect the A/F's.
If that doesn't take care of it, then someone is going to have to do some proper step-by-step hands-on diagnosis, as it could be darn near anything - like old O2's, or somebody ran some darned octane booster thru there (which can coat the O2's requiring replacement regardless of the fact that they all claim to be "safe" for O2's), or a vacuum leak, or an EGR problem, or a clogged fuel filter (which must be replaced every 5K miles on supercharged engines - not 10, 15, or 30K miles - every 5K miles, and use the original Ford Motorcraft filter), or any of many different things.
Good luck!
Finding out why that code is being thrown requires **proper diagnosis.**
You *might* have had a dirty MAF, they do need to be cleaned every year or two, though that must be done very carefully, by using electrical contact cleaner that will NOT attack plastic, and spraying it on the hot wire - then letting it sit for a couple of hours, and then reinstalling it - don't touch the MAF wires, and make sure you disconnect the battery before touching the MAF or it's wiring harness connector. The MAF is one of the most important parts on that entire vehicle - next to say, the brakes or the steering wheel, the MAF is probably THE single most important part, as it is the powertrain's load signal. It tells the PCM exactly how much air (volume & density) is entering the engine, which dictates things like the Air/Fuel ratios, and also affects things like engine timing and even shift points in the transmission.
All we can suggest for now is basic stuff - like making sure the MAF wasn't put back on backwards (it has an arrow molded into the barrel to show correct airflow direction), and that it has NOT been rotated from it's original orientation. In other words, make sure the electronic module where you plug in it's wiring harness connector is in the exact same orientation that it was when the vehicle was bone-stock - make sure it has not been rotated 180 degrees, or 90 degrees, etc, as that can affect the A/F's.
If that doesn't take care of it, then someone is going to have to do some proper step-by-step hands-on diagnosis, as it could be darn near anything - like old O2's, or somebody ran some darned octane booster thru there (which can coat the O2's requiring replacement regardless of the fact that they all claim to be "safe" for O2's), or a vacuum leak, or an EGR problem, or a clogged fuel filter (which must be replaced every 5K miles on supercharged engines - not 10, 15, or 30K miles - every 5K miles, and use the original Ford Motorcraft filter), or any of many different things.
Good luck!