Explorer 94, what is this and why is it making a clicking sound?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

jg - 29 Jul 2007 01:55 GMT

Hi and thanx to all who respond.

http://www.acequality.net/temp/explorer01.jpg
http://www.acequality.net/temp/explorer02.jpg

I have a 1994 Explorer that has started acting up. When I turn the
key to the on position, this cylinder clicks repeatedly 5 to 10 times
in a second or two and then it stops. Sounds exactly like a relay
closing and opening over and over again. This behavior might be
normal, however I just noticed it because my explorer all of a sudden
runs very rough. When idling, the RPM's vary between 600 to 1400
constantly up and down for as long as the engine is running and
sometimes, it will die. Runs so rough, it cannot be driven.

Also worthy of mention is the fact that my fuel pump does not run
every time I turn the key to the on position. I would say it only
runs about 50% of the time with it sometimes running 5 out of 5 times
and other times it not running 5 out of 5 times. Also, when the fuel
pump does not run, my Explorer will not start.

Is the fuel pump supposed to run every time I turn the key to the on
position? Or only if the pressure is low?

At any rate, any help is greatly appreciated.

Thanx in advance.

jg

Reply to this Message

Jim Warman - 29 Jul 2007 02:13 GMT

That is the idle air control.... I would assume that it is gummed up or
otherwise faulty.... some have had a certain amount of luck cleaning them
(so they say).. my preference is to simply replace it and be done with
it....

Having said that, it is important to review the nature of the failure.... is
this the build up from over 20 years of service, or is this the result of a
newer, separate failure and will it return to haunt you in the near
future????

> Hi and thanx to all who respond.
>
[quoted text clipped - 24 lines]
>
> jg

Reply to this Message

jg - 29 Jul 2007 02:40 GMT

Hi Jim,

Thanx for the quick response. So based on what you have said, I am
guessing that the sound it is making is not normal, correct? It
should not be clicking constantly like a relay?

I'm OK with replacing it and seeing what the outcome is if that sound
is not normal behavior.

Thanx again.

jg

> That is the idle air control.... I would assume that it is gummed up or
> otherwise faulty.... some have had a certain amount of luck cleaning them
[quoted text clipped - 34 lines]
>
> > jg

Reply to this Message

Jim Warman - 29 Jul 2007 05:44 GMT

The IAC works on a duty cycle.... this turns current on and off very rapidly
and, as far as my feeble old ears can tell, never emits an audible sound.

Somehow, I never made it past the first portion of your post nt far enough
to see the fuel pump concern at the very least... I don't have access to 94
circuit diagrams on line but I would have to wonder if there is some
commonality between the IAC and the fuel pump....

By the time I go back to work on Monday, I will surely have forgotten to
check the manual....

Reply to this Message

jg - 30 Jul 2007 21:59 GMT

> The IAC works on a duty cycle.... this turns current on and off very rapidly
> and, as far as my feeble old ears can tell, never emits an audible sound.
[quoted text clipped - 6 lines]
> By the time I go back to work on Monday, I will surely have forgotten to
> check the manual....

Hi Jim,

It is Monday now, can I bother you to check the manual for the
commonality between the fuel pump not running the the AIC. Any help
greatly appreciated.

jg

Reply to this Message