2000 Ford Windstar banks running lean - Engine ODB2 Fault Codes


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2000 Ford Windstar banks running lean

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Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes

lilolilarry
New User

Jan 9, 2010, 6:57 PM

Post #1 of 6 (5660 views)

2000 Ford Windstar banks running lean	Sign In

I have 2000 Ford Windstar with a 135k on it. The engine light has been coming on periodically. When we put a scanner on it it shows that both banks are running lean. I have replaced three oxygen sensors and the temperature sensor. There does not seem to be any head gasket leaks. After each of these fixes we reset so the engine light goes off. However, the light will come back on within usually a week. There seems to be no rhyme or reason as to when the light comes back on. Can anyone help me figure out what is going on?

cewjoe71
Novice

Jan 9, 2010, 10:06 PM

Post #2 of 6 (5654 views)

Re: 2000 Ford Windstar banks running lean	Sign In

Bad oxygen sensor, or vaccum leak

(This post was edited by cewjoe71 on Jan 9, 2010, 10:08 PM)

steve01832
Veteran
steve01832 profile image

Jan 10, 2010, 6:00 AM

Post #3 of 6 (5630 views)

Re: 2000 Ford Windstar banks running lean	Sign In

The first place to look is fuel pressure. You will need to hook a guage up to the test port and check it key on engine off, then engine running. Post back with the fuel pressure recorded from the test and we will go further.

Steve

way2old
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way2old profile image

Jan 10, 2010, 11:55 AM

Post #4 of 6 (5614 views)

Re: 2000 Ford Windstar banks running lean	Sign In

These engines are famous for intake gaskets leaking. Look at the O2 sensors to see what they are actually doing. Also look at the MAF sensor to be sure it is reading correctly.

Being way2old is why I need help from younger minds

Sidom
Veteran / Moderator
Sidom profile image

Jan 10, 2010, 12:10 PM

Post #5 of 6 (5610 views)

Re: 2000 Ford Windstar banks running lean	Sign In

There is a lot a good advise on things to check. You really do need make sure there are no vacuum or exhaust leaks 1st. Along with the intakes, those are good for bad PCV valve hoses at the manifold........

Scan data would be very helpful for this problem to help zero in on what system is causing the lean codes. As you see here there all the things mentioned to check, and ALL those systems can cause the lean codes. You really need to look at some fuel trims to help narrow the field a bit...............

tvaughn
New User

Feb 1, 2010, 2:29 PM

Post #6 of 6 (5486 views)

Re: 2000 Ford Windstar banks running lean	Sign In

I experience this. Fuel lean on both banks should be problem common to both rails. Fuel pump or fuel filter.
I lucked out, replacing the fuel filter fixed the problem.

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