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Old 11-15-2012, 06:49   #1 (permalink)
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These dreadful lean codes 171 and 174.....

I have both lean codes on my 2003 Ford expedition. It rides very ruff and acceleration is very choppy. It has lost tons of power and struggles to go up hills. When it does the check egine light would start to blink and the a/c would get warm until i let off the gas or press lightly on the gas...whats going on? Ive changed 1 vacuum leak I found and the fuel filter. Cleaned mass air flow sensor....idk.
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Old 11-15-2012, 08:30   #2 (permalink)
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Re: These dreadful lean codes 171 and 174.....

Checked it's firing on all cyls ? Possibly plug / coil breaking down ?
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Old 11-15-2012, 17:15   #3 (permalink)
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Re: These dreadful lean codes 171 and 174.....

Check it with the MAF unplugged and see how it runs.
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Old 11-23-2012, 20:03   #4 (permalink)
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Re: These dreadful lean codes 171 and 174.....

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Originally Posted by DemetriusGarla View Post
I have both lean codes on my 2003 Ford expedition. It rides very ruff and acceleration is very choppy. It has lost tons of power and struggles to go up hills. When it does the check egine light would start to blink and the a/c would get warm until i let off the gas or press lightly on the gas...whats going on? Ive changed 1 vacuum leak I found and the fuel filter. Cleaned mass air flow sensor....idk.

How many miles are on it? Has anybody checked the fuel pressure at the rails? It idles smooth?


-Mike
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Old 11-23-2012, 20:27   #5 (permalink)
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Re: These dreadful lean codes 171 and 174.....

If you have one vacuum leak, you may have more less easily detected. If all you did is replace one hose may have to replace more. Best rule of thumb, if one needs replacing, replace them all. Have you checked what your idle vacuum is?

Also, it's a 2003, don't know how many miles you have on it, but you're pushing ten years, may be time to clean the entire throttle system. Ford Mustang IAC IAB - Solving your idle problems
I know it's for a 5.0 for a mustang, but the components should be similar.
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