JR,

I've found a very quick way to "isolate" and "locate" a vacuum leak without
replacing hoses, o rings, etc.

Get a can of carb claaner with the narrow sprayer tube. With the engine
idling, spray at all hose connections, fuel injector mounts, etc. If a leak
is found, you will note a sudden stumbling or reduction of rpm's.

Replace the defective part......

Good luck,

Rich

JR Lomas wrote:

> No fuel additive or "better gas" is going to make your problem go away.
> I suspect you have a vacuum leak somewhere in your system. What is
> happening is that when the car is cold, whatever line or gasket running to
> the intake manifold or sealing it, respectively, is worn out. As the car
> heats
> up the hose or gasket expands sealing the leak.
> If you hook a pressure gauge to one of the vacuum lines you can verify
> it is a indeed a vacuum leak very easily.
> You will see your gauge wonder up and down as
> your car moves from 1400-2000 RPMs.
> If this is the case then do the following.
> To solve the problem, first inspect, and replace if necessary, all hoses
> leading to the intake manifold. Replace the PCV valve (cheap $2.49
> at any autoparts store).
> Provided all the hoses are good and you still have the problem, get a
> new intake gasket from NAPA (just bought one the other day for $16)
> and replace it. If that still doesn't solve the problem, then you will have
> to separate the throttle body from the manifold and replace the gasket
> (about $5) that seals the manifold the throttle body.
> Again I doubt you will have to do all this things, but if you do as you
> can see, if you do all the work yourself it is very cheap (under $50).
> Now, if this still doesn't solve your problem:
> pull out the injectors and replace the O-rings around then. Since they
> are plugged directly to the manifold they could be causing a vacuum
> leak.
>
> I hope the advice helps, keep us posted. So many people receive advice
> and never bother to post the solution to their problem once they
> actually fix it. Thank you to those who do.
>
> - JR
> "Delpie" <delpie@aol.com> wrote in message
> news:20031202232744.11003.00000074@mb-m24.aol.com...
> > How harmful are the additives that are sold to clean fuel injecters and
> the
> > like..
> >
> > I have a 1994 Integra with 209,000 miles and it still purrs and runs
> great.
> > For about a year I have a cold weather reving problem that lasts for
> about 1-2
> > minutes upon startup and when it has been sitting for a couple of hours.
> It
> > revs from 1400 RPM to 2000RPM rapidly until it warms up and then settles
> down
> > to a "normal" idle...about 800RPM.
> > My mechanic said to try a few tanks of premium gas( I have always used
> regular)
> > and I am on my second tank and upon startup it is getting better, but
> after
> > sitting for a couple hours I still get the reving problem!....In case this
> does
> > not work I was considering a "cleaning additive " of some type.
> >
> > Any thoughts???