PO171 and PO174 Fix!!
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Joined: Nov 2024
Posts: 3
Likes: 4
From: Claremont, California
PO171 and PO174 Fix!!
How do you know if its your PCV
A tell tale sign of a PCV issue is a rough start, and/or a rough idle, as well as the obvious CEL and Codes. Another sure fire way to check is to spray some starting fluid on the PCV joints and see if you get a jump in RPMs.
PO171 AND PO174
If you are throwing codes PO171 or PO174 for bank 1 and 2 too lean, the most common problem will be the PCV elbow joint. It is a silicone joint located right below the radiator hose on the passenger side of the engine. Like most all 4.0 ranger engines, the coolant hose has an abrasive cover on it that eats into the joint. Combined with the heat from the hose and the oh so common oil leaks, it will cause the joint to corrode. Below is a link to the part you will need to replace it.
https://www.oreillyauto.com/detail/c...01-ford-ranger
HOW TO INSTALL
Installation is tricky, and do not make the same mistake as me and do it right after running the engine. It's easiest to work on after the engine has cooled down.
1. Locate PCV Elbow joint underneath coolant hose
2. Remove short end first (Use lubrication like WD40 or Oil)
3. Remove long end. This can be very tedious due to the buildup of muck causing the elbow to stick. If you have no plans to salvage the part, just take a knife and cut lengthwise.
4. Lube up both ends of new part and the connecting tubes.
5. Install Long side first, then rotate elbow so small side is facing the cab.
6. Lastly connect the short end fire her up!!
Hopefully this should help some of y'all out!!
A tell tale sign of a PCV issue is a rough start, and/or a rough idle, as well as the obvious CEL and Codes. Another sure fire way to check is to spray some starting fluid on the PCV joints and see if you get a jump in RPMs.
PO171 AND PO174
If you are throwing codes PO171 or PO174 for bank 1 and 2 too lean, the most common problem will be the PCV elbow joint. It is a silicone joint located right below the radiator hose on the passenger side of the engine. Like most all 4.0 ranger engines, the coolant hose has an abrasive cover on it that eats into the joint. Combined with the heat from the hose and the oh so common oil leaks, it will cause the joint to corrode. Below is a link to the part you will need to replace it.
https://www.oreillyauto.com/detail/c...01-ford-ranger
HOW TO INSTALL
Installation is tricky, and do not make the same mistake as me and do it right after running the engine. It's easiest to work on after the engine has cooled down.
1. Locate PCV Elbow joint underneath coolant hose
2. Remove short end first (Use lubrication like WD40 or Oil)
3. Remove long end. This can be very tedious due to the buildup of muck causing the elbow to stick. If you have no plans to salvage the part, just take a knife and cut lengthwise.
4. Lube up both ends of new part and the connecting tubes.
5. Install Long side first, then rotate elbow so small side is facing the cab.
6. Lastly connect the short end fire her up!!
Hopefully this should help some of y'all out!!
Member
Joined: Sep 2019
Posts: 1,193
Likes: 182
From: Hackensack, Nj
Ha, I just checked mine and the cover on the large hose has begun abrading this PCV elbow.
Thanks for the part link AND the associated codes.
Q: Dorman's and O'Reilly's website show 2 elbows but only 2 hose clamps. Did you get a single elbow or two?
Going upstream from this elbow is a large, plastic "L-shaped" pipe which goes toward the firewall, turns to the engine's left and connects to the PCV valve at the rear side of the valve cover.
This pipe will embrittle with age. So, be ready if decides to crack while you're dealing with it or the elbow.
Thanks for the part link AND the associated codes.
Q: Dorman's and O'Reilly's website show 2 elbows but only 2 hose clamps. Did you get a single elbow or two?
Going upstream from this elbow is a large, plastic "L-shaped" pipe which goes toward the firewall, turns to the engine's left and connects to the PCV valve at the rear side of the valve cover.
This pipe will embrittle with age. So, be ready if decides to crack while you're dealing with it or the elbow.
Last edited by Georgeandkira; Dec 20, 2024 at 10:12 AM.
Thread Starter
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Member
Joined: Nov 2024
Posts: 3
Likes: 4
From: Claremont, California
Ha, I just checked mine and the cover on the large hose has begun abrading this PCV elbow.
Thanks for the part link AND the associated codes.
Q: Dorman's and O'Reilly's website show 2 elbows but only 2 hose clamps. Did you get a single elbow or two?
Going upstream from this elbow is a large, plastic "L-shaped" pipe which goes toward the firewall, turns to the engine's left and connects to the PCV valve at the rear side of the valve cover.
This pipe will embrittle with age. So, be ready if decides to crack while you're dealing with it or the elbow.
Thanks for the part link AND the associated codes.
Q: Dorman's and O'Reilly's website show 2 elbows but only 2 hose clamps. Did you get a single elbow or two?
Going upstream from this elbow is a large, plastic "L-shaped" pipe which goes toward the firewall, turns to the engine's left and connects to the PCV valve at the rear side of the valve cover.
This pipe will embrittle with age. So, be ready if decides to crack while you're dealing with it or the elbow.
Mine came with 2 pieces from Oreilys, couldn’t find a use for the smaller elbow but it could come in handy
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