Question about 1997 Saturn SL

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RPM's race when coming to a stop. Brakes seem to not work well but not sure it if is because of the RPM's racing or if the brakes are bad. Service light just came on - what does this mean? Help!!

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It sounds like you need to replace your throttle position sensor. I don't think it is your brakes

Posted on Oct 07, 2010

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Usually the brake booster unit has failed or there is a rather large vacuum leak when these symptoms appear. Engine speed increases do to lean mixture (vacuum leak) and poor braking performance (brake booster does not have enough vacuum to function properly).

Posted on Oct 07, 2010


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1 Answer

Accelerates when stopped

hot or cold. ? engine?
what year.?
what engine.?
what transmission, my guess is the A/T (with M/T the clutch is engaged and far safer car, as such)

my 3 jeeps with 4.0 all loved to race the idle. all M/T so is my 08
the ISC loved to stick, (PCV/EGR black cloud of death caused)

Some jeep engines, that are SPEED DENSITY based.
that is a MAP sensor not MAF based.
will race for the following reasons (all are classic and common)
1; any air leaks to the plenum. (aka Induction vacuum leaks)
2: ISC stuck open and jammed.
3: TPS bad.

The ECU knows its racing for sure. RPM.
and is for sure trying to lower RPM,
but cant, for all the reasons above.
that is how it all works.
The iSC is the idle speed control servo system.

the tests are easy, but takes tools.
got tools?
if not??, its , SHOP TIME.

Feb 18, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Engine wont catch

cranks fast
starts every time.
idles fine hot or cold , or both? hot idle not too fast.
i race engine , in park and neutral, I can hit 3500 rpm easy, can you.
i release brakes, (brakes are not packed in ICE , are they?)
I select 1gear or reverse (A/T or m/t)
the car moves or dont move, which is it, my guess catch = no move at all.
I try to drive, i look at RPM and MPH
RPM moves up and MPH track.
track means they both move in a linear progression.
RPM rises and for all RPM increases MPH also increases.
does it?
if all that works then we have an engine power issue.
weak on hills?

Jan 03, 2014 | 1998 Jeep Cherokee 4WD

1 Answer

Car starts but when u change the gear it dont move

RPM at 800 , in drive
can you race motor in neutral, to 2500 rpm
1: does rpm rise above 1500 in drive and no movement, (slip and bad tranny)
2: or holds about 1500 but can move. (brakes frozen , with ice)
try to push car in neutral on flat ground, can you>
no , the brakes are iced.
yes, then engine power is bad.
with A/T trans, you get to first find out.
1: is engine weak.
2: is tranny slipping (races to very high rpm and no go)
3: or brakes ices, (post location so we can see climate, duh?

Dec 01, 2013 | 2000 Toyota Corolla

1 Answer

2005 neon hard brakes engine races

While your car is running.......pop the hood and find the throttle body. The throttle body is where your air filter tube/hose goes to the engine. Locate the throttle position sensor which should be on the side of the metal throttle body. This should be the item causing this. If you grab the plug that is on the sensor and wiggle it while the car is running then the engine should rev and act up if thats the problem. If not let me know and I can direct you further. Thanks.

Sep 13, 2012 | 2003 Dodge Neon

1 Answer

Have a '95 Windstar. Was traveling about 45 mph today and the rpm gauge continued to stay where it was and the brakes barely stopped the car, while the engine continued to race as if still moving at 45...

There is more to the throttle then just the pedal. The cable at the other end by the throttle body could have been stuck or the throttle position sensor had an issue.

Apr 06, 2011 | Ford Windstar Cars & Trucks

1 Answer

Just replaced egr vavale car is racing engine

idle control valve ,where it is and what it looks like on this vehicle i honestly havent a clue ,none of these cars here in spain

Mar 28, 2010 | 2000 Mercury Cougar

1 Answer

When stop and getting ready to take off rpm race

It wouldn't be a bad idea to have a transmission specialist to run a scan on the transmission...could be a bad converter.

Oct 27, 2009 | 2004 Jeep Liberty

1 Answer

Motor races when you step on drakes

check all vaccum lines first when you step on the brake pedal does it feel normal. sounds like when your steping on the brake it causes a vaccum leak on the motor and causes it to race

Oct 18, 2009 | 2005 Ford Taurus

1 Answer

1993 Buick LeSabre idles too fast

I would Look For A Vacuum Leak, Given the Fact that ALL that Work was Done in a SHORT Amount of Time, And The Brakes ARE VACUUM ASSISTED, that when Brakes are applied the ENG. Light Comes on, Seems to Me It all May be related. It does not take Much to Pop A Vacuum line OFF Accidentally

Feb 06, 2009 | 1993 Buick LeSabre

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