extended cranking intermittently
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extended cranking intermittently
Periodically, when I go to start my 5.4 liter, it has an extended cranking problem, with no identifiable pattern. I replaced the fuel pressure regulator, with no improvment.
An odd (or maybe not) occurance I experienced while changing my fuel filter a while ago... after the filter was out and I was preparing to install the new one, all the fuel forward of the filter drained back and all over me. If this is happening while the filter is in place, the fuel seems like it would just go back to the tank. The extended cranking would be associated with recharging the line. Is there a check valve that could be stuck?
Thanks,
Brendan
An odd (or maybe not) occurance I experienced while changing my fuel filter a while ago... after the filter was out and I was preparing to install the new one, all the fuel forward of the filter drained back and all over me. If this is happening while the filter is in place, the fuel seems like it would just go back to the tank. The extended cranking would be associated with recharging the line. Is there a check valve that could be stuck?
Thanks,
Brendan
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Is it worse when the truck sat longer, say over night? Does it never occur if you shut the truck down and start it again less than 5 minutes later? If the answer to these questions is yes, then you have the pressure from the system leak either through an injector or back thru the fuel pump into the tank.
You can also check for this "condition" by just turning the ignition on and waiting 30 seconds for the FI to pressurize. If pressure is low, this should make a difference.
George
You can also check for this "condition" by just turning the ignition on and waiting 30 seconds for the FI to pressurize. If pressure is low, this should make a difference.
George
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The chk valve is in the fuel pump itself.You need to do a fuel pressure test at the fuel rail.And see how long it takes to pump up and how long it takes to drain back.
Yes as Art(krewat)has said the long crank hard too start and not stay running is usually a sign of the IAC.
Rich
Yes as Art(krewat)has said the long crank hard too start and not stay running is usually a sign of the IAC.
Rich
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George,
When the truck sits for extended period of time (hours to overnight) is when the problem is evident. I dont experience it when the motor is restarted after 5 minutes or so. I have in the past turned the ket to the run position and waited a few seconds and it does help.
If I had an injector leaking, would I have a fuel smell in my oil?
When the truck sits for extended period of time (hours to overnight) is when the problem is evident. I dont experience it when the motor is restarted after 5 minutes or so. I have in the past turned the ket to the run position and waited a few seconds and it does help.
If I had an injector leaking, would I have a fuel smell in my oil?
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Hi brenem42901,
Great to read that I guessed right ... unless you have an external leak, your pressure goes away over time either through the fuel injecors or back into the tank. I do not know if you would be able to tell a bad injector in the oil. It would not hurt to smell it. Most likely it is going back to the tank though - I'd look into the fuel pump, unless you find indication that it goes into the engine.
Maybe someone else can help here. I have only had this problem once on a project car and it turned out to be the fuel pump side ...
Cheers, George
Great to read that I guessed right ... unless you have an external leak, your pressure goes away over time either through the fuel injecors or back into the tank. I do not know if you would be able to tell a bad injector in the oil. It would not hurt to smell it. Most likely it is going back to the tank though - I'd look into the fuel pump, unless you find indication that it goes into the engine.
Maybe someone else can help here. I have only had this problem once on a project car and it turned out to be the fuel pump side ...
Cheers, George
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George,
I have seen this problem on a late model explorer and on a GM vehicle. The fix was replace the whole fuel sending unit in the tank and call it good. I will look into the injectors when I have them serviced, but my gut feeling is that the fuel pump assembly is gummed up.
thanks,
brendan
I have seen this problem on a late model explorer and on a GM vehicle. The fix was replace the whole fuel sending unit in the tank and call it good. I will look into the injectors when I have them serviced, but my gut feeling is that the fuel pump assembly is gummed up.
thanks,
brendan
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Krewat,
I have not tried your idea yet regarding pressing the accelerator 1/2" to test the IAC. Forgive my ignorance, but what is the IAC and what does it do?
Thanks,
Brendan
P.S.
I grew up in Long Island and chased a woman to Washington state when I was 26. The woman is history, but I'm still here!
I have not tried your idea yet regarding pressing the accelerator 1/2" to test the IAC. Forgive my ignorance, but what is the IAC and what does it do?
Thanks,
Brendan
P.S.
I grew up in Long Island and chased a woman to Washington state when I was 26. The woman is history, but I'm still here!
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From: Long Island USA
The IAC is the Idle-Air-Control motor, it basically acts like the high-idle cam on a carb.
So, if the computer can't open the throttle to raise the idle when cold, it'll start REALLY hard. If you step on the gas a little bit and it fires right up, it's the IAC.
So, if the computer can't open the throttle to raise the idle when cold, it'll start REALLY hard. If you step on the gas a little bit and it fires right up, it's the IAC.
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