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Old 04-13-2009, 03:48 PM   #1
youngrwaggs
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Default RPM Not Dropping after shift

Hey guys,

I was searching around the internet for a while, came to your forums and was searching for a while again. I couldn't find my problem in my searches (kept getting high idle threads)

So...

I have a 98 SL2 5SPD ~ 153k miles on it.

It idles as it always has, but the rpm gets really goofy when I am shifting.
I usually notice it around 4th gear. As soon as I shift into 4th (let's say about 2750 rpm) the rpm does not go down for a while, if at all.

In 5th gear once I have made it to about 60 mph and try to accelerate, I will get a boost in RPM but not speed.



I don't want to distract any thought, but recently (past 3 months) I have replaced the EGR valve, O2 sensor, ECTS (not the connector).

I also try to clean my throttle body routinely.

Any thoughts?

Thanks!
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Old 04-13-2009, 04:18 PM   #2
JRSTANGE
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Default Re: RPM Not Dropping after shift

your looking at the aic=idle air control valve on the throttle body or more than likely a tps=throttle position sensor.

I recently had this in my DD 97sl2.

Things i did:

replaced the cts=coolant temp sensor
replaced the aic=
replaced the tps
removed tb=throttle body and cleaned it
checked for vacume leaks off the tb
checked to make sure the throttle cable moves freely.

Howver in my case it turned out the previous owner had played with the throttle set screw on the tb. Once i re adjusted it it has been fine now.
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Old 04-13-2009, 04:35 PM   #3
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Default Re: RPM Not Dropping after shift

Ill probably start with changing the TPS, it seems to be the cheaper of the two.

What would make you suspect the throttle set screw?
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Old 04-13-2009, 05:32 PM   #4
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by youngrwaggs View Post
In 5th gear once I have made it to about 60 mph and try to accelerate, I will get a boost in RPM but not speed.
This sounds like a really badly slipping clutch.
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Old 04-13-2009, 07:06 PM   #5
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by PurdueGuy View Post
This sounds like a really badly slipping clutch.
+1. Sound like you have two issues. A dirty Throttle body and a worn clutch assembly.
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Old 04-14-2009, 12:17 AM   #6
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Default Re: RPM Not Dropping after shift

+2 for clutch. If the engine is spinning and the car isn't going faster, the clutch is slipping.

The RPM on my single cam used to raise or never fall when I had the clutch in. Turned out to be a very warped intake manifold gasket. I believe there is a write-up in the how-to section.

Last edited by velleguy73; 04-14-2009 at 12:27 AM.
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Old 04-14-2009, 09:45 AM   #7
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Default Re: RPM Not Dropping after shift

Well, I guess it's goodluck that I found this site that has the clutch replacement - without removing your engine tutorial

I wasn't able to change the tps last night, I had to drive too far to get it. I will change that tonight, and hope for the best.

But as for the clutch...

Any advice on where to buy a clutch kit, and what kind?

The most complicated thing I have done with my car would have to be brakes, or alternator...what are my chances of doing this clutch thing right?


Thanks guys!
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Old 04-14-2009, 10:15 AM   #8
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by youngrwaggs View Post
The most complicated thing I have done with my car would have to be brakes, or alternator...
Brakes are pretty simple. I think replacing the clutch will be alot more complicated then brakes.
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Old 04-14-2009, 01:36 PM   #9
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Default Re: RPM Not Dropping after shift

The Saturn dealership quoted me about 318 out the door for all of the parts.

I was hoping to spend about $100 less, but have no idea if there is a brand out there that would be just like OEM parts.

Not going for any performance here...any advice?
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Old 04-14-2009, 03:06 PM   #10
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by youngrwaggs View Post
The Saturn dealership quoted me about 318 out the door for all of the parts.

I was hoping to spend about $100 less, but have no idea if there is a brand out there that would be just like OEM parts.

Not going for any performance here...any advice?
You want a LUK clutch kit. Ive also had no issues with Valeo. I believe Clutchcity.com is where its suggested to get the assembly. Old Nuc im sure will post the website.

The procedure is quite simple with the right tools and a little luck. Im personally in the process of doing the operation right now
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Old 04-14-2009, 04:03 PM   #11
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Default Re: RPM Not Dropping after shift

I've had good results with the Luk clutches from http://clutchcityonline.com/
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Old 04-14-2009, 04:26 PM   #12
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Default Re: RPM Not Dropping after shift

Pep Boys had a LUK clutch for ~ 150 out the door. So that is a much better price, and it's been recommended twice

Another question:

My car is still drivable, what could the potential damage be if I wait to long to fix this?

Will my clutch eventually just ware out completely until I can't even shift?

Thanks!
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Old 04-14-2009, 04:31 PM   #13
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by youngrwaggs View Post
Pep Boys had a LUK clutch for ~ 150 out the door. So that is a much better price, and it's been recommended twice

Another question:

My car is still drivable, what could the potential damage be if I wait to long to fix this?

Will my clutch eventually just ware out completely until I can't even shift?

Thanks!
Yupp. It will wear to the point that having it in any gear with your foot off the clutch gets you the rapid rise in RPM's with no matching speed.
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Old 04-14-2009, 05:28 PM   #14
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Default Re: RPM Not Dropping after shift

I appreciate the quick feedback guys.

I am debating whether I will be trying this, this weekend or next (since it will take me an entire weekend)

I'll keep you guys posted.

Thanks!
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Old 04-27-2009, 01:22 PM   #15
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Default Re: RPM Not Dropping after shift

<summons a dead thread from weeks and pages past>

Hey guys,
I didn't get to my transmission because of the unpleasant weather. But that may be a good thing...

This morning was a cooler morning that we have had for a while, and my car seemed to do great shifting! Up until about the second stop light, which was maybe a mile of driving. After that, the slipping started happening again

Would you guys still suspect the transmission, or the valve body?

Thanks!
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Old 04-27-2009, 01:38 PM   #16
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Default Re: RPM Not Dropping after shift

EDIT:
Please don't make fun of me, I am still new to cars. I tend to read wikipedia and such about specific parts, like a valve body, without realizing its part of an automatic transmission
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Old 04-27-2009, 03:41 PM   #17
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Default Re: RPM Not Dropping after shift

I had this same exact problem on my 98 SL2 5 spd a few months ago. Turned out to be my thermostat. Check it out.

http://www.saturnfans.com/forums/sho...d.php?t=130401
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Old 04-27-2009, 03:48 PM   #18
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Default Re: RPM Not Dropping after shift

Quote:
Originally Posted by youngrwaggs View Post
EDIT:
Please don't make fun of me, I am still new to cars. I tend to read wikipedia and such about specific parts, like a valve body, without realizing its part of an automatic transmission
As the poster above is pointing out, this is usually temperature related. First replace the ECTS and check the connector condition if you have not done so yet. Then go for a drive in 5th gear at 35 to 45 mph and allow the temperature to come to the normal operating point. It should be 3/8 for 96 and newer and 1/2 for 95 and older cars. If it is less than this you should replace the thermostat. Then if the problem presets it will be much easier to locate and fix.
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Old 04-27-2009, 03:54 PM   #19
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Default Re: RPM Not Dropping after shift

Hey wolf,
Not to be rude, but in your posting, I didn't really see anything describing your clutch slipping...It seemed to mostly be idling.

Although at $26 I wouldn't complain about the thermostat being the problem...

Did you have some slipping issues?
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Old 04-27-2009, 04:28 PM   #20
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Default Re: RPM Not Dropping after shift

I didn't think it was your clutch slipping when I read your post the first time. When I saw the title about "RPM not dropping after shift" it reminded me of exactly how my car behaved. So I assumed you were having the same symptoms and Old Nuc helped me diagnose my problem. What does your temp gauge read when up to temp?

I just read your post again and you mentioned that:

"In 5th gear once I have made it to about 60 mph and try to accelerate, I will get a boost in RPM but not speed."

That does however sound like a slipping clutch. You should probably feel that symptom in all the gears if it is the clutch slipping. Would hate to see you spend a pile of $ on something that might not need replaced. Sorry if I threw you off.
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