Update, code 174-175 maf! light still on?

[phil a]

i replaced the maf sensor,, cleared the codes,,, drove 40 miles
light came on this morning before engine got totally warm,.,
Just as predicted,, this MAF would not fix problem,, it does run better
but still unsure on the idle when cold,, ranges from 550 -750 rpm and in gear ,,,trys to fluctuate until totally warm then its OK..
NOW WHAT,, take it to the Dealer at $800 or more!!!!!!!!!!
The horror stories I read about on the net are now coming true
where nothing can fix the problem.... $150 bucks down the drain..

[DRW1000]

What year is the Van?

Are you getting the same codes as before?

Why did you suspect the MAF?
What else have you tried?

[phil a]

Originally Posted by DRW1000

What year is the Van?

Are you getting the same codes as before?

Why did you suspect the MAF?
What else have you tried?

SORRY got carried away,,,,
the Van is 2001...
return -Zone tested and found the codes...
bought part at O' Rielys since return Zone was too
cheap,, had to be bad,, Not retested since light came on
will try to get tested tonight....

[phil a]

Originally Posted by phil a

SORRY got carried away,,,,
the Van is 2001...
return -Zone tested and found the codes...
bought part at O' Rielys since return Zone was too
cheap,, had to be bad,, Not retested since light came on
will try to get tested tonight....

I stopped by return-Zone got another reading,, this time
he said,, 171 and 174,, something about left bank or right!
a friend that was trained for FORD says oxygen sensor is probably
next to change.

[phil a]

Originally Posted by phil a

I stopped by return-Zone got another reading,, this time
he said,, 171 and 174,, something about left bank or right!
a friend that was trained for FORD says oxygen sensor is probably
next to change.

NEW symtom... Friday temp was 15*,, Van cranked about 10+ rev, I try
again cranks more,, good battery the engine starts,, way out of norm
for a modern car,, has this got any thing to do with 171 fuel delivery?

[garync1]

Originally Posted by phil a

NEW symtom... Friday temp was 15*,, Van cranked about 10+ rev, I try
again cranks more,, good battery the engine starts,, way out of norm
for a modern car,, has this got any thing to do with 171 fuel delivery?

Cant remember but did you do the tsb on your van the port seals replacement and isolator bolts.???

[phil a]

Originally Posted by garync1

Cant remember but did you do the tsb on your van the port seals replacement and isolator bolts.???

I have no idea what your talking about on the above statement?

[DRW1000]

DO NOT JUMP THE GUN AND CHANGE YOUR O2 SENSORS!!!!

171/174 are common failures for your year. There is a TSB for the fix. Search this forum under 171/174 or Isolator bolts and you will have a week's worth of reading material.........but it will help you solve your problem.

171/174 indicate lean conditions. (left bank and right bank). A lead condition is the result of unmetered air entering the intake. The PCM cannot compensate for this. On some years (99, 00 and 01 (maybe more) ) there are bolts inside the plenum that have rubber that deteriorate. When the rubber deteriorates the port seals (the ports between the plenum and intake manifold leak). This is where the unmetered air enters.

O2 sensors read the lean/rich condition and are often inaccurately blamed for the failure.

This is the reason why I originally asked how you came to the conclusion that you had a MAF problem because red flags always go up when I hear about 171 or 174 codes on a 99-01 Windstar.

[phil a]

Originally Posted by DRW1000

DO NOT JUMP THE GUN AND CHANGE YOUR O2 SENSORS!!!!

171/174 are common failures for your year. There is a TSB for the fix. Search this forum under 171/174 or Isolator bolts and you will have a wek's worth of reding material.........but it will help you solve your problem.

171/174 indicate lean conditions. (left bank and right bank). A lead condition is the result of unmetered air entering the intake. The PCM cannot compensate for this. On some years (99, 00 and 01 (maybe more) ) there are bolts inside the plenum that have rubber that deteriorate. When the rubber deteriorates the port seals (the ports between the plenum and intake manifold leak). This is where the unmetered air enters.

O2 sensors read the lean/rich condition and are often inaccurately blamed for the failure.

This is the reason why I originally asked how you came to the conclusion that you had a MAF problem because red flags always go up when I hear about 171 or 174 codes on a 99-01 Windstar.

THANKS FOR THE QUICK REPLYS
I called the FORD guy,, he agrees with your statements
( he works on BIG trucks),,, hes says spray the intake plenum
( plastic area) to see if engine rev or changes any way!!!

[wiswind]

A member did the update....and did an excellent job of documenting the process, with pictures.
This link should make the job very easy for you.

http://leckemby.net/windstar/windstar01.html

***Personal, unqualified opinion****
If it were my car....I would hold off on the PCM reprogram (reflash), that is part of the Dealer TSB, as the reprogram delays the timing to reduce the "pinging" due to carbon in the cylinders. The result of delaying the timing....might be a reduction in fuel economy.
I would only delay the timing if you need it.....