quits running after 3 min
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New User
Joined: Feb 2005
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quits running after 3 min
i have a 1987 ford f150 4.9, it runs great for about 3 min.
then quits running. i let it sit for about 10 min. it will start
back up for a little while. i have replaced alot of parts but
it still willn't stay running. any replays would be helpfull.
thanks, miker475 my first time on here. thanks again
then quits running. i let it sit for about 10 min. it will start
back up for a little while. i have replaced alot of parts but
it still willn't stay running. any replays would be helpfull.
thanks, miker475 my first time on here. thanks again
Tuned
Joined: Feb 2003
Posts: 495
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From: Cincinnati, Ohio
Does the engine just quit like the ignition switch has been turned off or does it stumble, lope, etc., before it dies? Any computer codes? When you restart after it dies does it blow black smoke, blue smoke, etc., is it hard to start?
John
John
Tuned
Joined: Feb 2003
Posts: 495
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From: Cincinnati, Ohio
I think you need check the fuel pressure at the fuel rail. There is a schrader valve located on the fuel rail that you can attach a fuel pressure gauge. You should read a minimum of about 40 psi. With the engine running watch the pressure to see if it falls off. Might be a problem with the fuel pressure regulator closing up and shutting the fuel off. Disconnect and plug the vacuum hose to the pressure regulator and see if that solves the problem. If the pressure regulator is good and you aren't reading about 40 psi then you either have a restricted fuel line or bad fuel pump or fuel pump relay.
John
John
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john,thanks for the reply, i will give that a try.if anyone has anyother
ideas please let me know.thank again. this site is a great help !!
ideas please let me know.thank again. this site is a great help !!
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Joined: Feb 2004
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From: Kansas City
Does it seem to die faster if you give it gas, or drive, versus it just idling?
If so it might be a clogged fuel filter. It lets gas through just real slow. Letting it sit gives it time to build pressure back up. Fuel filter is a pretty easy swap too. There are a couple tricks that help.
If so it might be a clogged fuel filter. It lets gas through just real slow. Letting it sit gives it time to build pressure back up. Fuel filter is a pretty easy swap too. There are a couple tricks that help.
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From: Kansas City
doesn't make a difference.
If it was low fuel flow/pressure it should. The more you try to use, the less you would have.
Did you check the fuel pressure?
Usually, if it just switches right off, it's ignition(spark). The TFI ignition has several parts with a history of intermittant problems.
What all parts have you replaced? What have you done so far to fix it?
That will us all some time.
If it was low fuel flow/pressure it should. The more you try to use, the less you would have.
Did you check the fuel pressure?
yes it just like you turn the key off
What all parts have you replaced? What have you done so far to fix it?
That will us all some time.
Last edited by clstrfbc; Feb 16, 2005 at 12:01 AM.