Idle very high

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Jul 27, 2020 | 05:13 PM

#16

FuzzFace2

FTE Legend

Joined: Nov 2015

Posts: 30,915

Likes: 4,123

From: Angier, NC

Quote:

Originally Posted by xenophone

Yes, that is the alternator. The black taped up cable is the negative battery cable, and the battery is just out of view. The two wires are spliced in right before the battery terminal. I'll see if I can find any vacuum leaks.

There is a vacuum tree down low and to the rear of the intake manifold. There is 1 port that has a cap that is hard to see and this cap likes to crack causing a leak.

Quote:

Originally Posted by xenophone

The electric choke assist on the carb is actually not hooked up, hasn't been since I bought the truck.

This could also be the high idle as the choke is not opening and the fast idle is still on.
Dave ----

Jul 27, 2020 | 06:18 PM

#17

xenophone

Thread Starter

Mountain Pass

Joined: May 2020

Posts: 227

Likes: 3

From: Lehi, Utah

Quote:

Originally Posted by FuzzFace2

There is a vacuum tree down low and to the rear of the intake manifold. There is 1 port that has a cap that is hard to see and this cap likes to crack causing a leak.

This could also be the high idle as the choke is not opening and the fast idle is still on.
Dave ----

But, the idle issue just started a couple days ago. There may well be multiple issues here, but up until two days ago the idle would settle down as the truck warmed up.

Jul 27, 2020 | 07:23 PM

#18

Franklin2

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Joined: Jan 2001

Posts: 56,984

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From: Virginia

Quote:

Originally Posted by xenophone

But, the idle issue just started a couple days ago. There may well be multiple issues here, but up until two days ago the idle would settle down as the truck warmed up.

If you look at the carb, your idle is controlled by a little dc motor which is operated by the computer. This is one of the nice features of this system....when it works.

Aug 3, 2020 | 05:47 PM

#19

xenophone

Thread Starter

Mountain Pass

Joined: May 2020

Posts: 227

Likes: 3

From: Lehi, Utah

I attached the old wire(s) to the negative battery post, and the idle is now functioning as it was before. The idle behavior still seems a bit weird (it always did), so I'll go through and check for vacuum leaks, and look into switching to the ECMless carb.

Thanks guys