Is there something I am missing?
#1
Is there something I am missing?
My truck is throwing the codes p0171 and p0174. It's on a 1998 4.6 v8. I replaced the vaccum hose to the back of the intake manifold/to the pcv valve, cleaned and checked the current for the maf sensor, checked for leaks on the intake, and replaced the pcv valve. The codes went away for about 2 weeks and now it's back. What should I look at/ replace next?
#3
#4
Senior Member
#6
Senior Member
Both banks are positive for lean, -so look at the air intake. Make sure the MAF O-Ring still exists and that everything is tight, - no leaks. Like your IAT grommet. That can't leak either.
When troubleshooting, keep in mind that BOTH banks are positive for lean. This usually indicates a problem just before the plenum and manifold.
When troubleshooting, keep in mind that BOTH banks are positive for lean. This usually indicates a problem just before the plenum and manifold.
#7
Both banks are positive for lean, -so look at the air intake. Make sure the MAF O-Ring still exists and that everything is tight, - no leaks. Like your IAT grommet. That can't leak either.
When troubleshooting, keep in mind that BOTH banks are positive for lean. This usually indicates a problem just before the plenum and manifold.
When troubleshooting, keep in mind that BOTH banks are positive for lean. This usually indicates a problem just before the plenum and manifold.
Trending Topics
#9
#10