Dreaded p0174&p0171

[Triprat4]

Hi there hows it goin ive used this site alot and i love it soooo helpful new member tho. Ive looked all over this forum amd i know there is a lot of these but here goes. The dreaded p0171&0174 too lean on both banks ive got the beastly 96 explorer xlt v8 awd. Let me start from the begging at first i had an egr code easy fix just dirty but bfor i cleared it i screwd up an hacked the muffler off then cleaned the egr which was carbon city i then cleard the egr code soon after i got the lean codes well i drove it for a bit got a new muffler thinking the codes were from zero backpressure wrong ive cleand MAF and recleand egr i e sprayed intake cleaner all over the engine to no avail in finding a vac leak i only have a muffler but am goin to add the resonator back to see if that helps i have zero drivabilty issues truck runs perfect i am at a complete loss and i have inspection next month any help with this is much appreciated thanks for reading

 

[Triprat4]

I have also replaced fuel filter

 

[ZWilson07]

More than likely it is in fact a bad vacuum leak.

You're best bet is to have a smoke test done on it. It could be numerous places including many parts of the exhaust system that are throwing off the O2 sensors.

 

[Triprat4]

It is in fact a vacuum leak i just did a ciggarette smoke test on the line that goes from the egr regulator to behind and under the intake manifold and voila still not sure if its the line, elbow, or somtjing further looking more in depth when ive got some light thanks zwilson07

 

[ZWilson07]

It is in fact a vacuum leak i just did a ciggarette smoke test on the line that goes from the egr regulator to behind and under the intake manifold and voila still not sure if its the line, elbow, or somtjing further looking more in depth when ive got some light thanks zwilson07

You're welcome. Sounds good man. Keep us updated on how it goes.

I've dealt with more vacuum leak issues this past year than in my whole life. Ive been trying to hold off but eventually i'm just gonna finally buy myself a personal smoke machine. You can get by sometimes with smoke trick using cigar/cig, propane, piece your own machine together, etc but i'd like to eventually get a nice smoke pro.

 

[Triprat4]

SOLVED PCV HOSE HAD POPPED OUT OF THE CRANKCASE. Caint fully reposition it. Only bout half way no room to work.

 

[ZWilson07]

SOLVED PCV HOSE HAD POPPED OUT OF THE CRANKCASE. Caint fully reposition it. Only bout half way no room to work.

Sounds good man. Glad you got it figured out.