hesitation
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
Mine has been doing this for a long time. It's so subtle I don't even notice it when I drive normal. If I put my truck in Park or Neutral and barely touch the gas pedal, it acts like it's going to die before revving up. Maybe it's a 300 habbit? Doesn't seem like it's any kind of a real problem. Just a 300 fart.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
Harte, maybe it's an I6 thing. I was waiting at a red light with a Big Rig next to me. The light turned green and I could hear the Big Rig clearly; it sounded like it did the exact same thing mine will do if you barely touch the gas pedal. The big rig didn't apear sick in any way.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
No Ford production engine is "supposed to" do that. My 300 accelerated perfectly when I had the Carter 1 barrel, and still does now that I put the Edelbrock 4 barrel on. I wouldn't think an EFI should do that since EFI is supposed to be an upgrade. This is a sign of a lean condition. When is the last time you tuned it up? How many miles on the injectors?
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
No Ford production engine is "supposed to" do that. My 300 accelerated perfectly when I had the Carter 1 barrel, and still does now that I put the Edelbrock 4 barrel on. I wouldn't think an EFI should do that since EFI is supposed to be an upgrade. This is a sign of a lean condition. When is the last time you tuned it up? How many miles on the injectors?
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
If this is the case then I haven't noticed. On a carbed engine, sometimes you can hear the engine shudder for a split second if you gun it in park. This is due to the float compensating for the sudden demand in fuel by opening the needle valve. Not sure what would do this on an EFI. I haven't experienced this just while feathering it in park, though.
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
If this is the case then I haven't noticed. On a carbed engine, sometimes you can hear the engine shudder for a split second if you gun it in park. This is due to the float compensating for the sudden demand in fuel by opening the needle valve. Not sure what would do this on an EFI. I haven't experienced this just while feathering it in park, though.
Off tipic, but when I feather in park and stop, the motor will continue to feather itself ever so slightly. Why is this?
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
If it were carbed I would guess that maybe only a very slight movement of the throttle is not enough to activate the acc pump but I wouldn't have a clue on the EFI. I haven't noticed this happening with my daily driver...straight six ISX 565 Cummins.
More Turbo
Joined: Apr 2008
Posts: 649
Likes: 0
From: Cottageville, WV
I agree, my 88 F150 300-6 did that and it used to drive me up the wall. No one else noticed it but I did. I changed the EGR out and no more hesitation.
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