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  #16  
Old 03-30-2014, 10:04 PM
pearlkid9988 pearlkid9988 is offline
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Default Re: E85 and codes PO171 and PO174

probably not if they are fouled but the new ones are called motor craft fine wire i think i paid 1.80 a piece for them from advanced they work great i don't get any codes on e85 with mine but I've always stayed away from any other brand i tried bosch once and it ran like crap so motor craft has always been good to me.
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  #17  
Old 03-31-2014, 06:40 AM
rangerlocal rangerlocal is offline
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Default Re: E85 and codes PO171 and PO174

Quote:
Originally Posted by pearlkid9988 View Post
I doubt that your flex sensor is the culprit as most pump gas has at least 10% ethanol now anyways it would cause issues on E85 or regular unleaded.
E10 and E85 are completely different animals. It could very well be his sensor if it runs completely fine on all pump gas and only shows it's rear end when he runs E85. But I do agree that if you're not running Autolite or Motorcraft plugs then it's time to switch over. I don't think plugs are going to fix your lean codes though.

If you really want to know if it's your sensor, gradually increase the concentration of E85. Fill it up halfway with regular gas and halfway with E85. If it gives you crap, pretty sure it's going to be your sensor. I'd only run regular gas anyway. Better power and mileage evens out the cost difference.
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  #18  
Old 04-28-2014, 11:20 AM
garo24 garo24 is offline
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Default Re: E85 and codes PO171 and PO174

Follow-up Post..

I had to replace the blower motor resistor last week and it also needed a new wiring harness. Since I was going out of town and didn't want to mess with the harness, I had my local shop install just the harness for me. While they had it, I told them about my problem with the A/C and air blowing out the defrost and not the front and that I thought I had a vacuum leak somewhere.

They checked it out and indeed one of the vacuum hoses had come off. I am also thinking that this might be the cause of my lean codes when running E85. I say that because the CEL came on two ago regardless of fuel type. I will post back my results later this week when I fill up with E85 to see if the CEL lean codes return or not.
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  #19  
Old 04-29-2014, 10:21 AM
Grampybox Grampybox is offline
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Default Re: E85 and codes PO171 and PO174

Quote:
Originally Posted by garo24 View Post
Guys, I know this an old post, but I am still having the same issue. LSt time I took it to my mechanic, they changed the sparks plugs and said the only other thing it could be, was the Flex Fuel Sensor.

Is there an easy way to test my MAF sensor? Since the original post, I did clean the MAF but cleaning didn't make the codes go away.
This should answer your question about testing the MAF sensor, but I would also think if the MAF is bad, it would throw a code regardless of E10 0r E85.
How to Test the Ford Mass Air Flow (MAF) Sensor

Quote:
Originally Posted by garo24 View Post
Follow-up Post..

I had to replace the blower motor resistor last week and it also needed a new wiring harness. Since I was going out of town and didn't want to mess with the harness, I had my local shop install just the harness for me. While they had it, I told them about my problem with the A/C and air blowing out the defrost and not the front and that I thought I had a vacuum leak somewhere.

They checked it out and indeed one of the vacuum hoses had come off. I am also thinking that this might be the cause of my lean codes when running E85. I say that because the CEL came on two ago regardless of fuel type. I will post back my results later this week when I fill up with E85 to see if the CEL lean codes return or not.
Don't know why, but I hadn't thought about looking around HVAC for a vacuum leak, although I recently replaced my air plenum. Thanks!

In with the article linked above, I also found in the 4.0 section, this article.
Troubleshooting P0171 and P0174
(Ford 4.0L V6)


I found this Thread when I did a P0171 search, saw it was brought back to life, and thought the above links may come in handy for anybody that may be chasing these codes.
Hope this helps, and again thx for the reminder of checking the HVAC vacuum connectors and lines as well, as I chase my own P0701 code remedies.
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