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Old 03-31-2009, 09:53 PM   #1
SevenStars
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Exclamation RPM's wont drop between shifts??


I tried searching and came up empty but I am running out of ideas..
The car in question is a 2000 saturn sl1 with the manual transmission

When I disengage the clutch to shift up or down a gear the RPM's wont go down until I shift or they will take 5 or so seconds before dropping.

Ex: Shift from 2nd to 3rd at 3000rpm: I let off the gas and push the clutch in, the rpm's will go up to 3200ish then back down to 3000rpm and it will stay there until I let the clutch out.
Also when I come to a stop the rpm's will stay at 1500 the whole time.

What could cause this?


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Old 03-31-2009, 10:56 PM   #2
Ssicarman
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The RPM's staying up while shifting driving in neutral is normal to an extent. They should drop after a while though.

Your idle RPM is certainly to high. If you have not done so already inspect the coolant temp sensor and connector for it. The sensor tip should not be cracked and the connector should not be wet with leaded through the sensor coolant and the termianls in the connector should not be corroded.

Past that you may have a vacuum leak.
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Old 04-01-2009, 12:34 AM   #3
SevenStars
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Quote:
Originally Posted by Ssicarman View Post
The RPM's staying up while shifting driving in neutral is normal to an extent. They should drop after a while though.

Your idle RPM is certainly to high. If you have not done so already inspect the coolant temp sensor and connector for it. The sensor tip should not be cracked and the connector should not be wet with leaded through the sensor coolant and the termianls in the connector should not be corroded.

Past that you may have a vacuum leak.
Just to gain an understanding why does it do that? In my camaro I let off the gas and push the clutch in and the rpm's drop down, the Saturn doesn't. To me when your`car hovers at 3000 rpm with no gas being applied it doesn't seem normal.
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Old 04-01-2009, 02:36 AM   #4
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Thats because you have bad intake manifold gasket. Very common on 3rd gen SOHC cars. During idle spray near the intake manifold gasket at each cylinder. Listen for idle changes. If you hear them then diagnosis is confirmed.

Also A bad ECTS can do this. 10 bucks at AA to get a new one.

Clean your Throttle body. A stick IAC can lead to this.

Why? Because of emissions. Your old camaro doesnt have the IAC. Although its purpose is to control idle rpms using the PCM, they found that by keeping the throttle open for a few seconds after the throttle pedal is released reduced emissions.

However its only for a couple of seconds.
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