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'96 Sebring - Idling Problems
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sametc
New User
Oct 29, 2008, 2:07 PM
Post #1 of 3
(3534 views)
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'96 Sebring - Idling Problems
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1996 Chrylser Sebring Convertible, 6 cylinder, 140k miles.
Last 10-12 days or so it's been idling funny. Tends to race from 700-1750 RPM when I'm sitting at a light, or if I leave the car running in park. The RPM jumps enough that if I'm not heavy enough on the brakes, the car jumps forward a bit.
Today, for some odd reason, the car has been idling low... 400-700 RPM. It stalled on me a couple times earlier because it was idling so low. Seems to be idling back around 700-1000 now.
Looking for advice to troubleshoot what is causing the idling problem... I'm worried it's going to get worse, or is a warning sign of something serious.
Thanks in advance for any help!
Charlie
(This post was edited by sametc on Oct 29, 2008, 3:51 PM)
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DanD
Veteran
/ Moderator
Oct 30, 2008, 4:20 AM
Post #2 of 3
(3518 views)
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Re: '96 Sebring - Idling Problems
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Hey Charlie.
There are literally thousands of reasons for the idle to be fluctuating the way you describe.
Anything from mechanical, induction, vacuum system, sensors or computer(s) even the transmission or its controls, all of witch could have a hand in this?
You could start on your own, by checking that all the vacuum lines are connected and not leaking due to a split in or rotted hose. Also make sure that all fluid levels are at their normal levels.
After that, I’m going to suggest taking the car in and have it scanned, not only checking for codes but for data input to the computer, along with computer output to the working devices.
There could be a sensor that is working within its known “normal” parameters; not setting a code but is still sending an inaccurate signal to the computer.
For example a throttle position sensor (TPS) that has a range of approximately .5 volt at idle, varying up to 4.5 volts at wide open throttle, (depending on where the throttle is positioned while driving) has an intermittent short to reference voltage.
You’re sitting still at a corner, foot off the throttle; the TPS voltage is bouncing from .5 up to 2.5 volts, where it should be a consistent .5 of a volt at idle.
All the computer knows is that the voltage is changing but is still within its working range and will not set a code.
With the computer seeing this changing voltage, it will try and prevent a potential engine stall, by making adjustments to the idle control, ignition timing and injector pulse.
One second the computer lowers the idle and then the next cranks it back up; giving you your condition.
Like I said this is only an example, so don’t run out and buy a new TPS; have the system scanned by someone that has a firm working knowledge of their test equipment & the proper operation of the car’s system.
Dan.
Canadian "EH"
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wavn2
Anonymous Poster
wavn2@aol.com
Nov 7, 2008, 10:02 PM
Post #3 of 3
(3494 views)
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Re: '96 Sebring - Idling Problems
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have oxygen sensor checked
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