Carburetor help needed

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CJB - 08 Jul 2006 00:42 GMT

Ok, I'm the guy with the formerly partially flooded Ranger.

Got the fluids changed, and now it's running. Here's the problem. It will
not run at idle at all. Give it throttle, it'll stay running. Drive it
down the road, and it runs smooth with plenty of power. It just won't idle.
Let the RPM's drop to near idle speed, and the truck dies like you shut it
off.

This is a 2.0 L with a 2bbl carb. The plate says E87E-9510-AA.

Any suggestions or help are appreciated. I'm thinking that this is a carb
issue, but maybe it's not. I've looked pretty hard for vacuum leaks, but
have found none.

Thanks again,

CJB

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ihcnut - 08 Jul 2006 02:18 GMT

Sounds like you have a loose vacuum line or a hole in a vac. hose somewhere.

>Ok, I'm the guy with the formerly partially flooded Ranger.
>
[quoted text clipped - 13 lines]
>
>CJB

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AmmonMan - 08 Jul 2006 19:01 GMT

You may have a problem with the idle circuit itself. Some applications have
solenoids that control the idle position of the throttle or the amount of
air supplied to the intake, thereby controlling idle rpm. It could also be
the idle jets are clogged or the idle air bleeds are clogged.

A carburetor has different fuel feed paths that become active at different
operating conditions. One circuit to supply fuel at idle, another that
provides additional fuel during the transition from idle to cruise, the main
metering circuit for normal cruise RMP, and one or more power circuits for
hard acceleration or increased power. Only the idle circuit is active at
curb idle. The other circuits start feeding fuel as the throttle plate is
opened further. At cruise the idle circuit is still feeding a small portion
of the total fuel charge. If the idle circuit is restricted, it is not very
evident at cruise because the other circuits are feeding the majority of the
fuel.

Hope this helps.

Ammonman

> Ok, I'm the guy with the formerly partially flooded Ranger.
>
[quoted text clipped - 13 lines]
>
> CJB

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CJB - 08 Jul 2006 20:04 GMT

> You may have a problem with the idle circuit itself. Some applications
> have
[quoted text clipped - 21 lines]
>
> Ammonman

That does help. This carb does indeed have a stepper motor that controls
the idle speed. The motor is working, but unfortunately, the motor dies
before it gets to a low enough speed for the motor to advance to control the
idle. Does that make sense? If I were to guess, I'd say that the motor
will run fine at 1200-1400 rpm, but dies below that. The curb idle on this
truck is 700 to 800 rpm.

My previous carburetor experience is limited to small engines and a couple
of 2bbl autolites on older F-150s. I'm not even sure that this carb has an
idle air adjustment screw, but that's what it acts like to me.

Does anyone have additional suggestions?

CJB

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CJB - 02 Aug 2006 02:29 GMT

I found a NEW carburetor on eBay for $150, half the cost of a reman.
Installed it and the truck runs literally like new.

Thanks all,

CJB

> Ok, I'm the guy with the formerly partially flooded Ranger.
>
[quoted text clipped - 13 lines]
>
> CJB

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