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

Hi and thanx to all who respond.

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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
jg
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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????

Reply to
Jim Warman

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

Reply to
jg

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
Jim Warman

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
jg

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