Slow SOHC

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Joe - 19 Feb 2005 06:18 GMT

97 Explorer auto 4WD SOHC 82k miles
My problem:
When I floor my SOHC, it revs up to only about 3-3.5 thousand RPM. It
rarely goes much over 4,000RPM... and if it does, it seems to go quite
slow. I just started noticing this, I'm certain a few years ago my
Explorer seemed much faster. Any ideas? Transmission related? I had the
fluid changed 30k miles ago however I don't recall the filter being
replaced. Any suggestions are greatly appreciated.
Thanks,
Joe

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Jim Warman - 19 Feb 2005 19:34 GMT

I'd think an engine related problem... when was the fuel filter last
replaced? Possibly plugged converter.... Any DTCs present?

> 97 Explorer auto 4WD SOHC 82k miles
> My problem:
[quoted text clipped - 6 lines]
> Thanks,
> Joe

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Joe - 19 Feb 2005 20:03 GMT

Thanks for the reply Jim,
Fuel filter replaced 20k miles ago. My CEL has not illuminated so I
assume there are no trouble codes. In neutral it revs well above
4,000rpm. Basically, the majority of the time when I floor it nothing
really happens... it picks up speed but fairly slowly. Occasionally
when I gun it, it does downshift and it indeed reaches 5,000rpm
(acceleration seems pretty quick) but this is again "occasionally"
not very often. I'm not familiar with the converter you're
referring to. Is there any way to test it?
Thanks

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Jim Warman - 20 Feb 2005 00:00 GMT

Catalytic converter.... there is no easy way to flow test them... A vacuum
guage might give an indication - look for vacuum to slowly fall off but even
this is no sure indication. You could undo the exhaust from the manifolds
and try it like that.

> Thanks for the reply Jim,
> Fuel filter replaced 20k miles ago. My CEL has not illuminated so I
[quoted text clipped - 6 lines]
> referring to. Is there any way to test it?
> Thanks

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Searcher 1 - 20 Feb 2005 01:53 GMT

Hey Jim,
I have taken notice to your expertise on this board, and I for one would
like to say THANK YOU. You have helped quite a few people out here and I am
sure we all appreiciate your words of wisdom.

Thanks again
Searcher1

> Catalytic converter.... there is no easy way to flow test them... A vacuum
> guage might give an indication - look for vacuum to slowly fall off but
[quoted text clipped - 12 lines]
>> referring to. Is there any way to test it?
>> Thanks

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Joe - 21 Feb 2005 03:46 GMT

I think my transfer case was stuck. The 4wd light would illuminated,
however I could not shift into low. I also heard relays clicking back
and forth from the 4wd selector knob upon startup. It seemed to buck
and felt as if the wheels were locked in corners. I hit the transfer
case with a rubber hammer and it now switches into 4wd/Low/Auto. I can
now hit those higher RPMs and it seems quite faster. Any hints to
repair my transfer case? I could just not switch it on BUT wont the
control trac turn it on periodically?
Thanks,
Joe

> Hey Jim,
> I have taken notice to your expertise on this board, and I for one would
[quoted text clipped - 5 lines]
>
> > Catalytic converter.... there is n easy way to flow test them... A

vacuum

> > guage might give an indication - look for vacuum to slowly fall off but
> > even
> > this is no sure indication. You could undo the exhaust from the manifolds
> > and try it like that.
> >
> >> Thanks for the reply Jim,

> >> Fuel filter replaced 20k miles ago. My CEL has not illuminated so I
> >> assume there are no trouble codes. In neutral it revs well above
[quoted text clipped - 5 lines]
> >> referring to. Is there any way to test it?
> >> Thanks

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