I have been trying to figure this s*it out for so long and I just cant put my finger on it. my fuel trims go down as I accelerate, my exhaust smells awful and I checked the fuel pressure. Bang right at 44 where it is supposed to be so I ruled that out. Cleaned MAF sensor twice and nothing. Any other options? My next idea is to smoke test it with a halloween fog machine because smoke tester are like $100. Can anyone please help me with this
P0174 AND P0171 V8 4WD Limited
- Thread starter BigMike18
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81runner
New member
Whatever it is, it's throwing both banks out of whack....I'd think fuel pressure regulator, PCV if you haven't done so already. After that, injectors and injector seals, though you would have multiple fouled in order to get 171 and 174... You could always RENT a smoke machine from a party store. That's what I did on my v6 4runner.
earthrealm
Senior Member
having been battling a p0174 on my v6 runner, tons of research have led me to believe that, if you have ruled out fuel pump, maf sensor, TB etc...the most likely culprit is a leak in the air intake manifold/exhaust manifold., do the smoke test, or the soapy water test
earthrealm
Senior Member
mine ended up being injectors, swapped out the 6 injectors with ebay remanns, and truck is as good as new, all CEL gone, fuel trims superb!.
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