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Old 05-15-2000, 11:50 AM   #1
Tim Prudence
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Post How do I fix a low idle?

My car has been idling at around 500 rpms. It's so low that sometimes it stumbles on itself when warming up. Does anyone know how I fix this? TPS?
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Old 05-15-2000, 02:32 PM   #2
Danny5
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Question

Hey Tim,

Just a question for you. I mean no disrespect, but I have seen at least a dozen other people who suspected the same exact problem and it turned out there wasn't one...

Ok - on your tach, the very first line represents 500rpm. The bold line between the first line and the 1000rpm line represents 750rpm. This is what the RS is supposed to idle at.

I have felt a 500rpm idle. The car stumbles, spits, coughs, wheezes, and just about everything else. At 500rpm, the tach needle is barely above the car *off* position.

Double check, but if the idle feels fine, I am willing to bet you just mistook the 750rpm line for the 500rpm one.

-Dan
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Old 05-15-2000, 03:06 PM   #3
Tim Prudence
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I'll double check this afternoon exactly what my idle is at. But the reason I am concerned is because the idle is very rough. Rough to the point where the car shakes noticeable and almost stalls. In fact, it will stall in the morning is I don't give it a little.

This problem is brand new (I have 20k miles), it surfaced after the turbo was installed last week.

[This message has been edited by Tim Prudence (edited May 15, 2000).]
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Old 05-15-2000, 03:08 PM   #4
bill harvey
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my 98 idles at 700 rock steady i wouldn't worry and don't adjust the tps like someone on here will probablly sugjest to you
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Old 05-15-2000, 03:26 PM   #5
Chung
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Question

Hey Tim, I also have the same rough idle problem after installed the JC turbo. Need help!!

Leo
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Old 05-15-2000, 03:49 PM   #6
bluesaint
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dats why i use s-afc hehe.. tell us exactly what ur idle is in digital numbers =)
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Old 05-15-2000, 04:34 PM   #7
ShaneW
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Did you check for an intake leak?

ShaneW
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Old 05-15-2000, 05:06 PM   #8
Tim Prudence
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Nope... I should do that.
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Old 05-15-2000, 07:16 PM   #9
CNC84
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Probably is a tps prob I heard of another guy that had a rough idle after installing his turbo turned out that his tps got bumped while work was being done on the engine it would be nice to have the S-afc to know your exact idle though.

Chris
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Old 05-16-2000, 12:09 AM   #10
Dan00RS
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I had this problem before (but in my old Saturn SL2) It turned out to be a bad coolant temp sensor. You might want to have that checked out. What happens is that the CTS reads really low or really high and it has the ECU adjust the revs accordingly to get the engine to the correct temp. But a bad TPS is not entirely out of the question either. But I would have the CTS looked at.

Or you could tie a brick to the gas pedal!!
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Old 05-16-2000, 12:43 AM   #11
Tarmac RS
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Ever wonder how many wasted keystrokes are posted to this board because the initial post didnt give detailed info.

starts out as low idle, ends up to be related to the recently installed turbo...

(donning my RONCO flameproof outergarment)

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Old 05-16-2000, 09:47 AM   #12
Tim Prudence
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I couldn't find any intake leaks, though my check consisted of just making sure all the hoses were securely connected.

Idle when warmed up usually keeps between 680-710, sometimes dropping all the way down to 650s.

It's worst when it's cold though, it does the normal fluctuating up and down idle. But sometimes it will drop down to about 550 and get stuck there, requiring a tap on the gas to get it back going.

Does anyone have a link to the TPS mod, I can't seem to access the main page anymore.

[This message has been edited by Tim Prudence (edited May 16, 2000).]
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Old 05-16-2000, 01:01 PM   #13
ColinL
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Go to Wal-Mart and buy a $2 can of Prestone Starting fluid. It's in the aisle with octane booster and whatnot.

Spray a small amount near a fitting, joint, airbox, whatever on your intake tract. If the engine revs, that's an intake leak. If you get all the way through the system with no increase in revs, you've got no leak.
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Old 05-16-2000, 01:16 PM   #14
Tim Prudence
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Thanks Colin!
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Old 05-17-2000, 12:53 AM   #15
Tim Prudence
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...boing...
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