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From: JeB on 27 Mar 2007 13:05
Hi folks -

I've got a '94 pickup with a 22-RE that has a flat spot in throttle
response about 2000-2200 rpm. It's been there since I bought the
truck (107k, now 185k) but it's been getting worse lately. It's most
noticable when the engine is transitioning from cold start to warmed
up ... ie as the thermostat is moving up to normal. Any suggestions
on where to start looking for the problem?

-jeb

From: M.Paul on 28 Mar 2007 11:40
I experienced the same flat spot with my '92 22RE. A good local independent
Toyota shop could not verify it, but it drove me crazy - seemed to be worse
when the engine was cold. I kept thinking it was the TPS. One one occasion
I was adjusting/measuring the TPS when I noticed that the vaccuum diagram
under the hood didn't match the diagram in my Haynes manual. There is a
place in the throttle body when 4 vaccuum lines connect to the TB very close
to each other (near the front). Two of those (I think the middle two) were
swapped according to the under the hood diagram. I swapped those and never
had another problem with the flat spot. It could have just as easily been
the TPS adjustment, but one of those two things fixed the flat spot.
Good luck!
M.Paul
"JeB" <no(a)spam.org> wrote in message
news:t2ni03drn3mhb4u12pki56eb3du0dor4j5(a)4ax.com...
> Hi folks -
>
> I've got a '94 pickup with a 22-RE that has a flat spot in throttle
> response about 2000-2200 rpm. It's been there since I bought the
> truck (107k, now 185k) but it's been getting worse lately. It's most
> noticable when the engine is transitioning from cold start to warmed
> up ... ie as the thermostat is moving up to normal. Any suggestions
> on where to start looking for the problem?
>
> -jeb
>


From: JeB on 28 Mar 2007 12:36
Thanx ... I'll take a look at the vaccuum plumbing and check out the
TPS adjusting.

On Wed, 28 Mar 2007 08:40:22 -0700, "M.Paul"
<mpaulcruiser(a)NO.SPAM.yahoo.com> wrote:

>I experienced the same flat spot with my '92 22RE. A good local independent
>Toyota shop could not verify it, but it drove me crazy - seemed to be worse
>when the engine was cold. I kept thinking it was the TPS. One one occasion
>I was adjusting/measuring the TPS when I noticed that the vaccuum diagram
>under the hood didn't match the diagram in my Haynes manual. There is a
>place in the throttle body when 4 vaccuum lines connect to the TB very close
>to each other (near the front). Two of those (I think the middle two) were
>swapped according to the under the hood diagram. I swapped those and never
>had another problem with the flat spot. It could have just as easily been
>the TPS adjustment, but one of those two things fixed the flat spot.
>Good luck!
>M.Paul
>"JeB" <no(a)spam.org> wrote in message
>news:t2ni03drn3mhb4u12pki56eb3du0dor4j5(a)4ax.com...
>> Hi folks -
>>
>> I've got a '94 pickup with a 22-RE that has a flat spot in throttle
>> response about 2000-2200 rpm. It's been there since I bought the
>> truck (107k, now 185k) but it's been getting worse lately. It's most
>> noticable when the engine is transitioning from cold start to warmed
>> up ... ie as the thermostat is moving up to normal. Any suggestions
>> on where to start looking for the problem?
>>
>> -jeb
>>
>

From: Evil4Runner on 29 Mar 2007 10:11
On Mar 28, 7:40 am, "M.Paul" <mpaulcrui...(a)NO.SPAM.yahoo.com> wrote:
> I experienced the same flat spot with my '92 22RE. A good local independent
> Toyota shop could not verify it, but it drove me crazy - seemed to be worse
> when the engine was cold. I kept thinking it was the TPS. One one occasion
> I was adjusting/measuring the TPS when I noticed that the vaccuum diagram
> under the hood didn't match the diagram in my Haynes manual. There is a
> place in the throttle body when 4 vaccuum lines connect to the TB very close
> to each other (near the front). Two of those (I think the middle two) were
> swapped according to the under the hood diagram. I swapped those and never
> had another problem with the flat spot. It could have just as easily been
> the TPS adjustment, but one of those two things fixed the flat spot.
> Good luck!
> M.Paul"JeB" <n...(a)spam.org> wrote in message
>
> news:t2ni03drn3mhb4u12pki56eb3du0dor4j5(a)4ax.com...
>
> > Hi folks -
>
> > I've got a '94 pickup with a 22-RE that has a flat spot in throttle
> > response about 2000-2200 rpm. It's been there since I bought the
> > truck (107k, now 185k) but it's been getting worse lately. It's most
> > noticable when the engine is transitioning from cold start to warmed
> > up ... ie as the thermostat is moving up to normal. Any suggestions
> > on where to start looking for the problem?
>
> > -jeb

I got the same problem but i don't got the manual can you be more
specifics about the position of the lines or can someones knows a
place where i can find those diagrams.

Thanks.

From: M.Paul on 29 Mar 2007 11:04
There should be a diagram pasted under your hood - that's the one that
worked for me.
There's also several available online, like at this site:
http://opc.mr2oc.com/online_parts_catalog/1992_toyota_Vacuum_diagrams.pdf

"Evil4Runner" <jkamberos(a)hotmail.com> wrote in message
news:1175177487.157921.150750(a)y80g2000hsf.googlegroups.com...
> On Mar 28, 7:40 am, "M.Paul" <mpaulcrui...(a)NO.SPAM.yahoo.com> wrote:
> > I experienced the same flat spot with my '92 22RE. A good local
independent
> > Toyota shop could not verify it, but it drove me crazy - seemed to be
worse
> > when the engine was cold. I kept thinking it was the TPS. One one
occasion
> > I was adjusting/measuring the TPS when I noticed that the vaccuum
diagram
> > under the hood didn't match the diagram in my Haynes manual. There is a
> > place in the throttle body when 4 vaccuum lines connect to the TB very
close
> > to each other (near the front). Two of those (I think the middle two)
were
> > swapped according to the under the hood diagram. I swapped those and
never
> > had another problem with the flat spot. It could have just as easily
been
> > the TPS adjustment, but one of those two things fixed the flat spot.
> > Good luck!
> > M.Paul"JeB" <n...(a)spam.org> wrote in message
> >
> > news:t2ni03drn3mhb4u12pki56eb3du0dor4j5(a)4ax.com...
> >
> > > Hi folks -
> >
> > > I've got a '94 pickup with a 22-RE that has a flat spot in throttle
> > > response about 2000-2200 rpm. It's been there since I bought the
> > > truck (107k, now 185k) but it's been getting worse lately. It's most
> > > noticable when the engine is transitioning from cold start to warmed
> > > up ... ie as the thermostat is moving up to normal. Any suggestions
> > > on where to start looking for the problem?
> >
> > > -jeb
>
> I got the same problem but i don't got the manual can you be more
> specifics about the position of the lines or can someones knows a
> place where i can find those diagrams.
>
> Thanks.
>


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