|
|
|
Diagnostic codes PO171 &PO174
|
|
|
| |
|
|
Guest
Anonymous Poster
snoe2006@yahoo.com
Mar 31, 2009, 10:31 AM
Post #1 of 10
(4620 views)
|
Diagnostic codes PO171 &PO174
|
Sign In
|
|
Hi all, I have a 2001 Ford Taurus and it recently set these two codes. I was told that it may be in the MAF sensor or PCV. Could someone tell me if this is correct? or if not guide me to fix this problem. Any help will be greatly appreciated Thank you
|
|
| |
|
|
way2old
Veteran
/ Moderator
Mar 31, 2009, 3:24 PM
Post #2 of 10
(4611 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
There are a lot of things that can cause those codes. That is for both banks being lean. Below are some possible causes.
For lean and rich DTCs: - Fuel system
- Excessive fuel pressure.
- Leaking/contaminated fuel injectors.
- Leaking fuel pressure regulator.
- Low fuel pressure or running out of fuel.
- Vapor recovery system.
- Induction system:
- Air leaks after the MAF.
- Vacuum Leaks.
- PCV system.
- Improperly seated engine oil dipstick.
- EGR system:
- Leaking gasket.
- Stuck EGR valve.
- Leaking diaphragm or EVR.
- Base Engine:
- Oil overfill.
- Cam timing.
- Cylinder compression.
- Exhaust leaks before or near the HO2Ss
Being way2old is why I need help from younger minds
|
|
| |
|
|
willyg
User
Mar 31, 2009, 4:29 PM
Post #3 of 10
(4606 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
Thanks very much for the help and quick response. With the list you gave me I'm not sure exactly what to do, is thereany way to narrow it down further? Thanks
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 31, 2009, 4:32 PM
Post #4 of 10
(4602 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
Which engine do you have? From left to right, what is the eighth digit of the VIN #? U, S, 2?
Loren
SW Washington
|
|
| |
|
|
way2old
Veteran
/ Moderator
Mar 31, 2009, 4:33 PM
Post #5 of 10
(4601 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
A scan tool that will read live data is about the only way to narrow it down quickly. Other than that, usually the top of the list is the most frequent cause and work your way down the list. Most of the time if you get both banks lean, look for something that will affect both sides of the engine (vacuum leaks, low fuel pressure, air leaks after the MAF. possibly the MAF itself.) If fuel pressure is not low, then go to the air induction system. These checks are the same for lean or rich conditions.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Mar 31, 2009, 4:35 PM)
|
|
| |
|
|
willyg
User
Mar 31, 2009, 4:40 PM
Post #6 of 10
(4594 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
The engine is front to back and the vin is a u. Thanks for all the good information, I hope I can solve it from what you have listed. I appreciate all the help!
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 31, 2009, 4:43 PM
Post #7 of 10
(4592 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
Thanks for the reply.. VIN U...blows my theory.
Loren
SW Washington
|
|
| |
|
|
willyg
User
Mar 31, 2009, 4:52 PM
Post #8 of 10
(4589 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
You said it blows your theory, what was your theory? Is it something that can help me? Thanks
|
|
| |
|
|
Loren Champlain Sr
Veteran
/ Moderator
Mar 31, 2009, 4:58 PM
Post #9 of 10
(4585 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
No, sorry. I was thinking IMRC leak, but your's doesn't use it.
Loren
SW Washington
|
|
| |
|
|
willyg
User
Mar 31, 2009, 5:02 PM
Post #10 of 10
(4582 views)
|
|
Re: Diagnostic codes PO171 &PO174
|
Sign In
|
|
I have a scan tool that reads live data, what should I be looking for that will help me narrow it down? Your help is greatly appreciated
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
Lukewarm Heat............
Buy Flualprazolam Powder Online Whatsapp: +1(424) 328-1086
1989 toyota pickup 3.0 crank no start
