Re: 94 Explorer cranks but no start, details inside Thanks for any helpOn 5 Apr 2007 08:41:01 -0700, "Paul G." <carbide@egine . com > wrote:
>On Apr 5, 6:48 am, J Adams <u...@yahoo . com > wrote:
>
>> >Sounds very much like the fuel pump relay. Open the relay box on the
>> >passenger side, under the hood. Swap the A/C relay with the fuel pump
>> >relay- each has an unused pair of contacts, and they are opposites so
>> >they will be good as new.
>>
>> >If that doesn't do it, another common problem is the crank position
>> >sensor.
>>
>> Where is the crank position sensor? Is there a way to test if its bad?
>
Thanks Paul,
Located the sensor, bottom center front (under). I ran the code reader
and nothing came up. I think I interpreted what you wrote correctly.
>I don't have personal experience with the crank position sensor, but
>if you search this newsgroup you'll find info like this:
>
>Here's some good info from Dr. Bob on the crank position
>sensor:
>
>"The crank position sensor is the hall effect sensor pointing to the
>front of the crankshaft. The hub behind the front pulley has grooves
>machined in it, with one groove missing. the sensor reads each of the
>pulses from the grooves to know exactly how far the crankshaft has
>turned, and reads the missing groove to re-identify a known position
>to reference from.
>
>This allows the ignition and fuel injection systems to make sparks and
>fuel at the right time.
>
>There is a 'limp home' mode, as you have discovered, that allows the
>engine minimum operating ability so you aren't stranded.
>
>A failed sensor generates an error code, so the diagnosis is fairly
>straightforward. If you weren't at a Ford dealer, the $200 is the
>result of not having the right code reader. The sensor takes mere
>minutes to change."
>
>Here's a description of the problems it causes:
>
>"The crank sensor went out last fall on our '92 XL, too. The car would
>suddenly die and wouldn't start again. After about 10 minutes, it
>would
>start up fine and run like there was nothing wrong (until it would die
>again, usually days later). Finally, it would run only poorly (the
>"limp home" mode, I guess)."
>