Cars - Saturn 95 sc2, idle dies on me..

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Saturn 95 sc2, idle dies on me..

When i drive my sc2 the idle goes from 1000rpm down to dead stop,
expecially when i give it more gas then usall and stoping at a light. I
changed the idle control valve, but no luck. Any suggestions??>?

Saturn 95 sc2, idle dies on me..

EGR or intake manifold leak would be where I'd start looking.
Just my 1/50 of a dollar
-WaV

JaY wrote:
> When i drive my sc2 the idle goes from 1000rpm down to dead stop,
> expecially when i give it more gas then usall and stoping at a light. I
> changed the idle control valve, but no luck. Any suggestions??>?

Saturn 95 sc2, idle dies on me..

Blau - I have to disagree with you on this one. The ECT sensor goes out
"high" or "open". I dont think they short out. If they did, I'm not
thinking it would make the engine die from slow idle.
That said - I've never encountered THIS particular problem. Not in a
Saturn. Checking all other sensors would be a logical plan for finding
the problem.

What you said about 95 being a changeover leaves me scratching my
head... The only way to tell the engines in my 94 and 95 apart is the
way the air intake routes into the air filter box and the difference in
the EGR - in 95 the EGR became directly electronically controled rather
than the vacuum diaphram actuator. They both have the same temperature
sensors in the same places with the same wiring configuration. Did the
95 begin using two O2 sensors? (I havent been down there long enough
under the 95 to notice if there was a downstream post-cat-converter O2
sensor).

Three particular sensors I'm thinking of which may be involved are MAP
sensor, Throttle position rheostat, and the air inlet temperature
sensor.

Peace -
WaV

BläBlä wrote:
> In article .com>,
> says...
> >
> > BläBlä wrote:
> > > In article . com>,
> > > says...
> > > > When i drive my sc2 the idle goes from 1000rpm down to dead stop,
> > > > expecially when i give it more gas then usall and stoping at a light. I
> > > > changed the idle control valve, but no luck. Any suggestions??>?
> > >
> > >
> > > When cold or only after its warmed up?
> > >
> > > EGR or ECT sensor or Fuel pressure. Diagnosing beats replacing.
> >
> > when warmed up, is there anyway to check the egr valve..... i looked up
>
> EGR vavle may not be able to close. Clean out any carbon buildup.
>
> > the ect sensor but could not find one. anything else it might be called
>
> Engine Coolant Temp Sensor. 95 was a change over year, you may have 2.
>
> http://www.autoglossary.com/

Saturn 95 sc2, idle dies on me..

JaY wrote:
> BläBlä wrote:
>
>>In article . com>,
says...
>>
>>>When i drive my sc2 the idle goes from 1000rpm down to dead stop,
>>>expecially when i give it more gas then usall and stoping at a light. I
>>>changed the idle control valve, but no luck. Any suggestions??>?
>>
>>
>>When cold or only after its warmed up?
>>
>>EGR or ECT sensor or Fuel pressure. Diagnosing beats replacing.
>
>
> When warmed up...
>

Not sure if Saturns have this problem, but in many cars the idle control
valve adjusts the airflow at idle; however, the control depends on a
minimum air flow past the throttle plate. If the throttle plate and
bore are gummed up so that too little air passes by in the "closed"
position (it's not supposed to be completely closed), then the idle air
controller runs out of travel and the engine stalls.

What brings this up is your initial complaint of the engine stalling at
idle when stopping, such as at a light. This is a classic symptom of a
gummed up throttle plate in many cars. I know I routinely (every 30-50K
miles) clean the one in my '94 Saturn SW2 after learning that I needed
to clean my Plymouth Voyager throttle at that interval. I can't recall
if I have ever experienced the same symptoms in the Saturn that I did in
the Voyager, however.

It is simple and free to try cleaning and see if it helps your symptoms.
It not, then continue with the suggestions of others. If you do clean
it, don't just spray carb cleaner in to the throttle area, because the
solvents may be bad for rubber parts farther in. Remove the duct from
the air cleaner, and use a solvent moistened cloth to clean both sides
of the throttle plate, and the bore where the plate closes. Try not to
plug any of the little holes in the bore.

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Ned Forrester 508-289-2226
Applied Ocean Physics and Engineering Dept.
Oceanographic Systems Lab http://adcp.whoi.edu/
Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA