Idling rough...running lean need help

Kapitald · #1 07-13-2009, 12:41 AM

P0171-FUEL SYSTEM 1/1 LEAN

Im throwing that code....I dont know how or where to diagnose my problem...Its idling so rough at idle that it sounds like a v-8 camming. At wot my air fuels are in the 12's working up to 13's when they used to be in the safe 11's.

Im going to get a cheap set of stage one injectors off a forum member and swap them out to see if that fixes it...apparently im running lean somewhere...could my stock fpr be a problem?

Any help appreciated...Im pretty positive plugs and wires are good.

This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!

70x7 · #2 07-14-2009, 11:35 AM

perhaps the fuel pump is failing

Kapitald · #3 07-14-2009, 01:57 PM

It starts up good every time and drives me where I need to get to and never dies. Is there anyway I can troubleshoot this stuff?

70x7 · #4 07-14-2009, 04:43 PM

"A code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor. "

Kapitald · #5 07-15-2009, 08:11 AM

where is the MAF located?

70x7 · #6 07-15-2009, 02:24 PM

Its the sensor located on top of your intake manifold. 2 short torx screws hold it in. Wires trace up underneath the injector cover.

FYI
Ours is a MAP sensor (Mass Air Pressure) as opposed to a MAF which is sensing flow. Same function. The MAP sensor compares signals to the TIP ( I believe it stands for Throttle Inlet Pressure) sensor which is located in the UPP. When signals are way out of wack, a CEL is thrown. This is very common once boost controllers are added.

Kapitald · #7 07-16-2009, 01:28 AM

I was wondering why you wrote "MAF" when all I know is MAP and TIP and TPS

Well my car isnt throwing a bunch of codes and running like crap...just the one code for running lean. I need to do a fuel pressure test but im unaware of how to go about doing it.

I checked the injectors today and they all seem to be fine.

70x7 · #8 07-16-2009, 12:05 PM

Basically its just a gauge you can put inline. Any shop could do it.
Perhaps your 02 sensor(s) are beginning to fail....just throwing out other suggestions.