Robert

I hope someone out there has a solution for me.
After driving (from a cold start) for about 20 -25 minutes with the
heater & lights on, the engine switches into a very high RPM and stays
there. This is hard on gas, brakes, transmission & probably more.
I can correct the problem by turning the engine off for a couple of
minutes. When I restart it the RPM stays normal. The problem is that on
my hour long commute to work in heavy traffic, it is not safe to turn
the engine off.
So far I have tried replacing the Idle Air Valve, disconnecting the air
conditioning, and pulling out the Cruise Control fuse. None of these
have worked.
My mechanic wants to "try" replacing the Throttle Body next. Before I
go this route, does anyone out there have any other ideas?
Thanks

 

Chuck

I would guess that the water temp sensor is bad or the thermostat is
sticking open.
"Robert" <ottoscout@telus.net> wrote in message
news:1131314640.610264.85920@o13g2000cwo.googlegroups.com...
>I hope someone out there has a solution for me.
> After driving (from a cold start) for about 20 -25 minutes with the
> heater & lights on, the engine switches into a very high RPM and stays
> there. This is hard on gas, brakes, transmission & probably more.
> I can correct the problem by turning the engine off for a couple of
> minutes. When I restart it the RPM stays normal. The problem is that on
> my hour long commute to work in heavy traffic, it is not safe to turn
> the engine off.
> So far I have tried replacing the Idle Air Valve, disconnecting the air
> conditioning, and pulling out the Cruise Control fuse. None of these
> have worked.
> My mechanic wants to "try" replacing the Throttle Body next. Before I
> go this route, does anyone out there have any other ideas?
> Thanks
>

Joe

The 302's are notorious for large intake manifold leaks, which result in a
high idle. Since yours is intermittent, I'm not sure if that's an option. It
really helped mine, though, when I replaced the gasket between the upper and
lower manifolds.

"Robert" <ottoscout@telus.net> wrote in message
news:1131314640.610264.85920@o13g2000cwo.googlegroups.com...
>I hope someone out there has a solution for me.
> After driving (from a cold start) for about 20 -25 minutes with the
> heater & lights on, the engine switches into a very high RPM and stays
> there. This is hard on gas, brakes, transmission & probably more.
> I can correct the problem by turning the engine off for a couple of
> minutes. When I restart it the RPM stays normal. The problem is that on
> my hour long commute to work in heavy traffic, it is not safe to turn
> the engine off.
> So far I have tried replacing the Idle Air Valve, disconnecting the air
> conditioning, and pulling out the Cruise Control fuse. None of these
> have worked.
> My mechanic wants to "try" replacing the Throttle Body next. Before I
> go this route, does anyone out there have any other ideas?
> Thanks
>

Richard Powers

your small exhaust cross over tube is probably leaking and causing to truch
to run fast.There is also the possibility you have a vaccuum leak, but I
assume you mrch. has checked this!!

"Robert" <ottoscout@telus.net> wrote in message
news:1131314640.610264.85920@o13g2000cwo.googlegroups.com...
>I hope someone out there has a solution for me.
> After driving (from a cold start) for about 20 -25 minutes with the
> heater & lights on, the engine switches into a very high RPM and stays
> there. This is hard on gas, brakes, transmission & probably more.
> I can correct the problem by turning the engine off for a couple of
> minutes. When I restart it the RPM stays normal. The problem is that on
> my hour long commute to work in heavy traffic, it is not safe to turn
> the engine off.
> So far I have tried replacing the Idle Air Valve, disconnecting the air
> conditioning, and pulling out the Cruise Control fuse. None of these
> have worked.
> My mechanic wants to "try" replacing the Throttle Body next. Before I
> go this route, does anyone out there have any other ideas?
> Thanks
>