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Old 07-21-2009, 03:09 PM   #1
99 SL2
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Default 99 SL2 high idle at start

I noticed a high idle when starting my '99 SL2 with 158K a few weeks ago. Idles at about 2100 RPM for 4-5 secs then goes to 1100 or so. It also seems to tach up a little more than usual when down-shifting (automatic) coming to a stop. Runs ok other than that when driving, and idles around 800 in gear. Haven't changed the ECTS so I'll do that, but how much does that affect idle speed? Should I go with a TB cleaning or will a couple cans of Techron at fill-ups help? Any ideas?

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Old 07-21-2009, 03:26 PM   #2
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Default Re: 99 SL2 high idle at start

new ECTS and a throttlebody cleaning. If that doesn't do it, let us know. Those 2 things probably cure 80% of idle issues with these cars.

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Old 07-21-2009, 03:34 PM   #3
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Happy Re: 99 SL2 high idle at start

Quote:
Originally Posted by PurdueGuy View Post
new ECTS and a throttlebody cleaning. If that doesn't do it, let us know. Those 2 things probably cure 80% of idle issues with these cars.
X2, replace the ECTS with a BRASS tip one. I even got mine at Autozone, and had no problems.

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Current:
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1995 Eagle Vision 3.5L TSI 117K
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94 SL2 125K miles Diff Pin Blew!
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Old 07-21-2009, 03:42 PM   #4
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Default Re: 99 SL2 high idle at start

Techron won't hurt - might clean up your fuel injectors, but it won't help clean the throttle body. The throttle body only gets air from the front, plus oil and crud from the PCV valve. It's a simple removal to clean - richpin video in the How To Library.

When I cleaned mine, I didn't use a brush or anything. Just sprayed it with carb cleaner until it was shiny. There were a few areas I had to rub with my finger.

x3 on the ECTS. If it tells the PCM "engine is cold", PCM makes the idle faster to warm up more quickly. If it tells the PCM "engine warm", PCM will drop it to normal idle speed.

...
...Wait, what, I actually won that eBay auction?
Guess I now (12/2008) own a 1998 SL2, silver, 5 spd :p
102k @ purchase, now 167k
And now (7/2010), a Craigslist 1997 SC2, white, 5 spd

Last edited by alordofchaos; 07-21-2009 at 03:47 PM..

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Old 07-25-2009, 11:29 PM   #5
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Default Re: 99 SL2 high idle at start

If you find out the answer, I'd like to know. My '97 SC2 has been doing this ever since I bought it used.

75k miles later (now at 175k total) it's still does it, so i figure it's not hurting too much. It seems to be exaggerated when starting cold. It jumps to 1.8-2k, for about 4 seconds, and then moves itself down to 1.2k. If the engine's warm, it might go as high as 1.6, but moves back down immediately.

I've changed the ECTS, cleaned the TB a bunch of times, and also replaced the TPS. The only thing i haven't done is changed the TB gasket, but I also couldn't find any leaks last time I checked.

Any other ideas out there? Other than this....my cars still running good.

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