Question about Saturn SL2

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Some times when i start the car it idles up real high then drops down to normal idle speed. also when i put it into gear it wants to idle real low and die

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  • 693 Answers

Need to replase your throttle control sencor. The is what tell your cars computer to excelerate. . It could also be your fuel filter .But your make was common to have this problem. Take to a parts store near you and they will test for free. And you will know for sure. Wish you the best of luck.

Posted on Apr 05, 2011

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Posted on Jan 02, 2017

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1 Answer

Why does the voltage drop to battry volts when i put the gear lever in drive?


the voltage should remain at 14.5 volts at all engine speeds above idle 13.9 volts at idle indicates that the alternator is charging but not at set voltage
head lights are the biggest drain that affects charge rate rate and it it maintains and from you description that is not a problem
when you select a gear it indicates a heavy drain which is a high resistance or a dead short in that circuit that is taking out more power than the alternator is charging
There there is nothing in the gear selection that draws such power
the other thing is that when selection a gear the engine rpm is tool low and the alternator stops charging
for auto vehicles , the idle rpm should be at 800-900 rpm dropping to 750-800 in drive

Jul 08, 2017 | Ford Cars & Trucks

1 Answer

High idle at start and during driving, takes off on its own, drops at stops.


With high idle in park, usually my first test is to block off mouth of throttle body. It should kill the engine, if no or very little effect on idle, You got false air getting in there from somewhere.
What about your cruise control? You can check and clean idle air system, where applicable? Any applicable trouble codes?
I don't know year--make--model?

Sep 30, 2017 | Cars & Trucks

1 Answer

How do I decrease idle speed?


The higher idle speed is part of the "cold start" sequence. It is controlled by the thermostat and a temperature sensor. You may need to change them both for faster action.

Aug 07, 2015 | 2003 Mercury Mountaineer

1 Answer

Toyota corolla hatch 2002 idle at 2000 rpm when


All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.

Sep 17, 2014 | Cars & Trucks

1 Answer

The idel on my 1992 chevrolet lumina 3.1 euro goes high then drops down low in park or in gear what is problem


Could becaused by a few different thing's . Map sensor , idle air control valve , a vacuum leak . Having the vehicle's scan data viewed would probably pin point the problem . Do you know what scan data is ? Is what a professional tech uses to find problems .
084 Engine Mechanical Tests Scan Data for Vacuum Leak
007 Idle Speed Problems Scan Data for Idle These kind of test's are what seperate week end DIY'ER's from a professional tech.

Jul 01, 2017 | 1992 Chevrolet Lumina

1 Answer

Idle drops way down in drive gear in park it's fine or running the A/C


what car is this, could be normal or not depending, like my 73 nova dogs down when put in gear but its suppose to with a 3 speed turbo. if its a newer car its not. and would sudject checking transmission fluid/filter or even replace both. if your fuild is low or old the transmission wont slip as easy and will make you car work harder to idel while sitting still.

Jun 08, 2012 | 2004 Dodge Neon

1 Answer

Airconditioning works fine while riding, but at stop light the idle drops down and the air blows hot. Does not do it all the time


a selinoid controls idle speed when ac is on or off. check this first. idle should increase when ac is turned on.

Apr 13, 2012 | 2005 Chrysler PT Cruiser

2 Answers

Oil gauge drops low at idle


Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

Apr 08, 2012 | 2002 Jeep Grand Cherokee

2 Answers

I got a Jeep Wrnagler 1989 5 speed 2.5 liters when it starts it idles high and idles real low


Seems like you got a fuel pressure issue.Bogs down in 3rd. .Then idle high and low.Also check the MAP sensor its up along the firewall.Make sure the hose and electrical is connected,

Feb 27, 2012 | 1994 Jeep Wrangler

1 Answer

Rough low idle in gear when stopped at a light.


probable vacuum leak query brake booster

Jul 26, 2009 | 2001 Dodge Neon

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