Confused
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Confused
I have a 1999 Ford V-10 Triton 6.8L engine with 100,000 miles in my Motorhome. Service engine soon light has been a problem for the past couple months. I have replaced the O2 sensor on the passenger side and the EGR valve. After that I drove for about 300+ miles continuously and stopped to get gas. Light stayed off and I thought I had it fixed but after starting up again the light came back on. The codes are P0171 and 0174. I have read at least a dozen posts on this problem with almost as many answers. I had the air filter replaced before changing the sensor and valve and mechanic left the Mass air flow sensor out of the socket I had a sluggish engine and at the time I thought I sucked water into the filter, I was driving in a pouring rain, this sensor plugs into the air intake above the filter correct?) I plugged that back in. What is my next move because I reset the service engine soon light and it runs great then the light comes back on after I shutdown and restart.
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Joined: Sep 2012
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From: Dallas, TX
Those codes indicate a lean condition on both banks. So it's either getting more air than it expects or not as much fuel as it expects. Check for vacuum leaks in the intake after the air flow sensor. It could be a cracked or loose intake hose, leaking where the throttle body meets the intake, leaking where the intake manifold meets the heads, bad PCV valve or cracked PCV hose. On the fuel side, check to make sure you're getting good pressure to the fuel rails.
Sometimes these general 'lean mixture' problems can be a real PITA to track down. If it were me, I'd check for intake leaks, and if I didn't see something obvious, take it to the shop. But then, I'm kind of impatient. Wish you the best of luck.
Sometimes these general 'lean mixture' problems can be a real PITA to track down. If it were me, I'd check for intake leaks, and if I didn't see something obvious, take it to the shop. But then, I'm kind of impatient. Wish you the best of luck.
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Joined: Nov 2006
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From: muskegon mi.
went thru this with the wifes sport track had changed both o2s with bauch just like ford sells it kept givihg cel took it to ford stealership driveabilty guy said the o2s were the same but diff he kept it 2 hrs said he had to re map the fuel been fine ever since cost 75$$$
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