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post #1 of 5 (permalink) Old 07-18-07, 09:12 AM Thread Starter
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2001 2.3L P0171 code

I'm getting code P0171 on my 2001 Mazda B2300 2wd manual with 53K miles. It runs fine and gas mileage is good but I have a state emissions test coming up soon. I cleaned the MAF but after clearing the code it still comes backs after a few days. It seems there are a crap load of possible causes including vacuum leaks and fuel delivery problems. I'm looking for tips on narrowing the possibilities or experiences other people have had with this problem.

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post #2 of 5 (permalink) Old 07-18-07, 01:02 PM
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Re: 2001 2.3L P0171 code

You don't have any kind of performance intake do you? I know of some K&N cold air intake systems making engines run lean. My other concern would be the EGR system. You can clean out the valve but with only 52k miles, it seems premature for gunk to be clogging the valve.

My Fords:
'98 Crown Vic LX
-167k miles and counting. Still used as daily driver.

'99 Crown Vic Police Interceptor
-Completed full PI swap
-Marauder Airbox & 80mm MAF
-'04 CVPI Ziptube
-ADTR ported plenum
-Steeda Intake Spacer
-BOC tune
-J-Mod tranny
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post #3 of 5 (permalink) Old 07-18-07, 01:17 PM Thread Starter
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Re: 2001 2.3L P0171 code

It's completely stock. No mods at all.
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post #4 of 5 (permalink) Old 07-19-07, 10:34 AM Thread Starter
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Thumbs up Re: 2001 2.3L P0171 code- problem fixed

I found the problem. The vacuum hose connecting the intake manifold to the fuel pressure regulator was severely cracked at both ends. It almost looks like it burst at one end. Ford needs to use a higher temp rubber like viton or silicone. The color of the truck is black but if 5 years and 50,000 miles can do that much damage in New England what happens down in Florida or Arizona?
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post #5 of 5 (permalink) Old 07-19-07, 11:14 AM
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Re: 2001 2.3L P0171 code

Glad to hear you found the problem.

My Fords:
'98 Crown Vic LX
-167k miles and counting. Still used as daily driver.

'99 Crown Vic Police Interceptor
-Completed full PI swap
-Marauder Airbox & 80mm MAF
-'04 CVPI Ziptube
-ADTR ported plenum
-Steeda Intake Spacer
-BOC tune
-J-Mod tranny
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