2000 Ford Expedition Long Crank after Cleaning MAF

Tiny
YELGNISSM
  • MEMBER
  • 2000 FORD EXPEDITION
  • V8
  • AWD
  • AUTOMATIC
  • 70,000 MILES
Hi-
We started having to do two cranks on the car to get it started, but once it starts it's fine.

We checked the codes and it's throwing PO171 and PO174 lean both banks.
Service engine light is on.
===========================
THINGS DONE ALREADY:
Undid positive cable (should I have done negative?) On battery before working on MAF
I cleaned the MAF with the correct cleaner. Removed air filter and sprayed it well.
Reconnected battery cable.
SERVICE ENGINE LIGHT IS OUT AND IS STAYING OFF at least for 4 days sofar.

BUT car is still long starting. Either takes a long crank to start, or we mostly do two cranks. BUT it always starts on the second crank.

Car runs totally fine. No noticeable change in fuel economy or performance. Drives the same.

ALSO IMPORTANT TO KNOW:
-Brand new Ford Spark Plugs
-New Gas Filter
-New Oil Change
-New Battery
-Not a new air filter, but coming soon in a week or so.

=========================

I'm wondering if the computer is still resetting the starter mix, but it just seems like it has not enough gas to start on the first crank.

What do you think?

We had no problems at all until the long cranking started.
First did the fuel filter
then did the plugs
then the MAF




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Tuesday, April 1st, 2014 AT 7:12 PM

5 Replies

Tiny
HOMER1967
  • EXPERT
I would suspect that you have an intake leak. Which would have to be checked for on a stone cold motor in order to find it.I would suggest that you have a shop with a smoke machine diag it for you.
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Tuesday, April 1st, 2014 AT 8:43 PM
Tiny
YELGNISSM
  • MEMBER
Where would the intake leak possibly be? I've read that it can be a vacuum hose. Or something.

I'm an american but live in the rural philippines, and might not find a diagnostic like that.

Is there a way I could check the hoses, etc a different way?
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Tuesday, April 1st, 2014 AT 8:52 PM
Tiny
HOMER1967
  • EXPERT
The leak would most likely be at the area where the intake bolts to the heads, but you will only be able to test for. It on a stone cold engine. There are other ways to test it, but I am not crazy about them, as the require flammable liquid to be sprayed on the engine, I would search around and see if you can find some one there who can do the test for you. Or you may want to look on you tube for intake leak tests.
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Tuesday, April 1st, 2014 AT 9:06 PM
Tiny
YELGNISSM
  • MEMBER
Possible its a dirty intake air valve?
Some forums also suggest the fuel pump pressure thing that maintains system pressure.
I can clean the iac
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Tuesday, April 1st, 2014 AT 10:05 PM
Tiny
HOMER1967
  • EXPERT
Yea, theres a lot of things that it could be. Try this, next time you start it up cold, instead of cranking it just turn the key on for about four seconds then turn it off for about four seconds, repeat this about three times then crank it and see if it's better. If so then I would say that you have a fuel pressure or volume issue. Let us know.
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Wednesday, April 2nd, 2014 AT 7:04 PM

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