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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I get codes p0171 p0174 and po157. On my 08 dodge 1500 sxt 3.7. I changed all 4 o2 sensors, spark plugs, air filter, map sensor. Cleaned the sensor in the intake box, then I found a tube coming from the air filter box goin to the back of the engine that was dry rotted and cracked. I changed the little hose and still am popping the codes???? IAC?? Maybe im gonna change it and ill let ya know what happens!
OK, I went to Autozone and rented a fuel pressure gauge . I hooked it up to the fuel rail and pressed the little button on the side with the clear tubing. It relieved the fuel pressure. Seemed like there was a lot of air in the system cause fuel didnt come out, only air. I started the engine and the gauge read 60 psi! So the fuel pump is good! I looked all over for other tubes that might have had cracks or were loose. I crwled under the truck and checked the O2 sensor connections ( all were good) I cleared the engine faults with my code reader. Then disconnected the negative battery cable for about 15 minutes. I started the truck and drove back to Autozone and back( about 10 miles) and the engine light stayed off and hasn't come back on!!!! So maybe air was built up in the fuel rail? i think air was causing the lean condition p0157 p0171 and p0174 to come on. Truck is running a lot better and is not stalling or shuttering while driving. Hope this helps someone out!!
