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2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

gerber
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7 years 9 months ago #22564 by gerber

2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs. was created by gerber

2001 f150. 5.4 wont start after let it seat for acouple hrs.. or ithe morning ...
No codes.. no check engine light on. If i put little gas on the intake. .start right away.snd run with no problem..
New fuel pump. (Pressure 40 psi) new fuel filter.. air.filter.. i used good iac..new iat.. i cleaned the maf sensor. New sparkplugs.. any advice
Thanks..

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Ben
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7 years 9 months ago #22574 by Ben

Replied by Ben on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

I suspect a fuel pressure regulator leaking down and allowing air into the fuel rail try cycling the key and allowing the fuel pump prime to run 10 times before cranking and see if it starts that way. A gauge may also be helpful in diagnosing this but I don't believe that engine had a Schrader so it would have to be an inline ...

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gerber
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7 years 9 months ago #22605 by gerber

Replied by gerber on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

IF i open the swich first time fuel pressure go to 20 psi and the secound time go to 40 and stay there for long time without move .. but i will try again and let u know.. thank you for taking the time to help me..

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Ben
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7 years 9 months ago #22630 by Ben

Replied by Ben on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

What we want to do is cycle it several more times to purge air from the rail (if that is the problem) then see if it starts right up

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gerber
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7 years 9 months ago #22632 by gerber

Replied by gerber on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

I did 15 times. But still wont start..... and fuel pressure is at 40 psi no drops.

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gerber
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7 years 9 months ago #22634 by gerber

Replied by gerber on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

I did 15 times. But still wont start..... and fuel pressure is at 40 psi no drops. If i put some carburator choke after maf sensor wont start too.. but if i do before the maf start right away.. and if i cut it off and try again starts fine and runs fine .. i put a used good maf sensor and still the same .. it got a new air temperature sensor.. air filter. And the coolant sensor is show the right temperature..

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Chad
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7 years 8 months ago #22645 by Chad

Replied by Chad on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

gerber wrote: If i put some carburator choke after maf sensor wont start too.. but if i do before the maf start right away

Are you saying that if you spray Carburetor Cleaner into the intake BEFORE the MAF, drawing the carb cleaner THROUGH the MAF, it will start?
But, spraying in AFTER the MAF, it won't start?

Like this?:

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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gerber
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7 years 8 months ago #22646 by gerber

Replied by gerber on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

Yes..

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gerber
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7 years 8 months ago #22647 by gerber

Replied by gerber on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

But already try with another maf sensor and atill do the same.. and iat is new..

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Chad
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7 years 8 months ago #22657 by Chad

Replied by Chad on topic 2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

Hmmm. I wonder if that has anything to do with the spray pattern? At what angle is the spray going in AFTER the MAF? I wonder if it is "pooling" instead of "misting". Just speculating and grasping at straws...:dry:

When cranking and no-start, do you have injector pulse?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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gerber
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7 years 8 months ago #22665 by gerber

Replied by gerber on topic 2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

Yes

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BowtieGuy18
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7 years 8 months ago #22690 by BowtieGuy18

Replied by BowtieGuy18 on topic 2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

You need to smoke test your engine when its cold. It sounds like you may have a vacuum leak that is sealing up when the engine gets warm such as a lower intake gasket.

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gerber
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7 years 8 months ago #22701 by gerber

Replied by gerber on topic 2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

I used start fluid and water too but nothing .

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Ben
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7 years 8 months ago #22709 by Ben

Replied by Ben on topic Re:2001 f150. 5.4. Wont start in the morning or let it off for acouple hrs.

When using starter fluid with intake tube disconnected you need to disconnect maf connector as well I suspicion that's with it only starts when sprayed through maf housing

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