2001 Ford Taurus shows PO171&PO174


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2001 Ford Taurus shows PO171&PO174

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Guest
Anonymous Poster
snoe2006@yahoo.com

Jul 22, 2009, 2:30 AM

Post #1 of 3 (3503 views)

2001 Ford Taurus shows PO171&PO174	Sign In

Hi all, this is a 2001 Ford Taurus with overhead valve engine. I recently ran some fuel injector cleaner with fill up. The car runs really rough now stumbling and hesitating while idling. The two codes came up PO171&PO174. I took out Mass Airflow Sensor, cleaned it put it back in, and it is still stumbling. Does it just have to run its course or will I need to look further at something? Thank you for any help

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 22, 2009, 3:48 AM

Post #2 of 3 (3500 views)

Re: 2001 Ford Taurus shows PO171&PO174	Sign In

I see the combination of those 2 codes on Fords quite often and it is almost always caused by a bad vacuum leak. Check all the rubber connectors at the manifold, especially the ones feeding the PCV line or brake booster. The rubber elbows tend to suck a hole in while running and close up when shut off so listen for a hissing noise and follow it.

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Anonymous Poster
snoe2006@yahoo.com

Jul 22, 2009, 5:08 AM

Post #3 of 3 (3495 views)

Re: 2001 Ford Taurus shows PO171&PO174	Sign In

Thank you for responding so quickly. Early, I did have the hood up and was able to hear the hissing and it came from a hole in the pcv hose. I replaced the hose and valve together and is running fine

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