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Author Topic:   Need idle help with a 300 I6
kid vishus
Gearhead

Posts: 5105
From: middle of NC
Registered: Oct 2000

posted 06-10-2003 04:47 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The afore mentioned problem is on KK's '84 F150. It has a granny 4 speed, and a carbed inline 300 six banger. Thge problem is, I can't get the idle to change with any of the screws on the carb. The stupid book both of has just says to "adjust the idle speed screw", and doesn't which one that is. Regardless, I have turned all of them I can find, and the only thing that changes the idle speed is changing the timing.
And that's another problem with it. If I set the timing where it should be, the truck is gutless. If I crank a bunch into where it runs good, it has a terrible case of "run on" when you try to shut it off. I have found the spot where it wont kick back when hot with extra timing in it, but, the run on is really bad.

We need to get it "sniff tested", and they cant do it with the idle that high.

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SteveLaRiviere
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Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-10-2003 07:30 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
That Carter YF carb is one massive pile of crap. If the idle mixture screw does nothing it's probably rebuild time.

Have you checked it for vacuum leaks? Those poorly engineered intake/exhaust combos love to crack and leak.

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kid vishus
Gearhead

Posts: 5105
From: middle of NC
Registered: Oct 2000

posted 06-10-2003 07:45 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The stupid thing sounds like it has an exhuast leak. I foudn the donut gasket was none existant, so I replaced it today, and it still sounds like it has a leak up around the motor somewhere. The guys at the test station said they cant test it with the idle that high, and with that exhuast leak, it wont pass anyways.

How do you check for vacum leaks on that? I know how to do it on my racecar, but thats not the same critter.

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SteveLaRiviere
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Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-10-2003 08:01 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Try to stall it with your hand. If the exhaust is leaking at the head, it probably warped the intake. My '86 300 did that three times. God I hated that engine!

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 06-10-2003 09:02 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
The idle speed should be on the linkage somewhere. If it's backed out all the way,the timing is too far up,or a vacuum leak.

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kid vishus
Gearhead

Posts: 5105
From: middle of NC
Registered: Oct 2000

posted 06-10-2003 09:13 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by MLariviere:
The idle speed should be on the linkage somewhere. If it's backed out all the way,the timing is too far up,or a vacuum leak.


On the linkage? That stupid book both KK and myself have says it's on the carb itself. Am I looking in the wrong area? What does the adjuster on the linkage look like so I know what I am looking for?

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SteveLaRiviere
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Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-10-2003 09:46 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
IIRC, the idle speed screw and the fast idle screw are right next to each other on the throttle lever. {near the firewall side?}

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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kid vishus
Gearhead

Posts: 5105
From: middle of NC
Registered: Oct 2000

posted 06-10-2003 09:49 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Thanks, I don't think I have been turning the right screws.
That didn't sound "right".

I'll give that a try tomorrow.

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SteveLaRiviere
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Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-10-2003 09:50 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I think I remember now I had to adjust it from the driver's side with a long screwdriver.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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64FalconF-16
Gearhead

Posts: 191
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002

posted 06-11-2003 12:12 PM     Click Here to See the Profile for 64FalconF-16   Click Here to Email 64FalconF-16     Edit/Delete Message   Reply w/Quote
Vacuum Leak around the intake Kid. Check on the bottom side. Your card won't do crap when they leak like that. Had an 81 that did the same thing.

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kid vishus
Gearhead

Posts: 5105
From: middle of NC
Registered: Oct 2000

posted 06-11-2003 04:12 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Thanks everyone.

I went out today, and started it, let it get good and warm, then put my hand over the carb. It died right away.

So, I went to the adjusting screws on the linkage. It's amazing what you can do when you know which screw to turn. It was turned in almost all the way. It's now wonder it was idling so high. It sill smells and sounds like it has an exhuast leak up by the motor, but at least it's idling slow enough we can get it tested, even if it is going to fail.

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 06-14-2003 01:01 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Good luck with it. I meant the linkage,aroung the throttle shaft.

Those 6's were pigs. Don't waste your time planing the manifolds,they will just warp again. An aftermarket manifold setup may help.

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SteveLaRiviere
Administrator

Posts: 36138
From: Saco, Maine
Registered: May 99

posted 06-20-2003 08:22 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by MLariviere:
Those 6's were pigs. Don't waste your time planing the manifolds,they will just warp again. An aftermarket manifold setup may help.

I liked my repair better... Swapped it for a 351C.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com

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MLariviere
Moderator

Posts: 3578
From: Biddeford,Me.USA
Registered: May 99

posted 06-23-2003 09:37 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote

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