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Originally Posted by chrisheltra
Well last night I was coming home from the dragstrip and threw a P0171 and P0174 code. Bank 1&2 lean. I also threw another one but cant remember off the top of my head what the number was. It was something about air charge temp and it happened right after I got off the interstate. I havent done any mods to the truck since about April and got a dyno tune shortly after so thats not the problem. What are some of the common causes for these codes to come up. Are all of these codes related to the same problem?
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The rubber 90 behind the intercooler in the intake sump(were the puddle of oil is) will let hot air from the back of your engine under the firewall if the 90 is busted (vaccuum).
the spot with the oil puddle on Larry's truck (in the pic) is the inside of that fitting