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Registered
2001 Seville STS
Joined
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7 Posts
Discussion Starter #1
First, I'm loving this site. I replaced the plenum gasket (thanks to this site) and the iac valve. My car gives no codes and runs wells at highway and street speeds. It's when I come to a stop or barely accelerate when the idle goes up and down and sometimes stalls. Can someone give me some clues to my slow speed, weird idle problem?
 

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Super Moderator
2010 DTS
Joined
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87,415 Posts
:welcome:

Have you cleaned the TB? If not, you're overdue. If you need help, see the tutorial in the Tech Tips section.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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70,672 Posts
Where are you looking for any Diagnostic Trouble Codes. Use the car's built-in system. The sticky post ^^^ "How to pull codes".

A slow idle and stalls will set DTC's. Not in the normal DIC center warnings and messages - you need to get into the code system's memory to retrieve codes.
 

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Registered
2001 Seville STS
Joined
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7 Posts
Discussion Starter #4
I found no codes on the car system and I cleaned the TB when I installed the plenum gasket. However, not sure if I cleaned it well enough. It was dirty when I took it off. I will go back in and throughly clean it this time. Will keep you posted.
 
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