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Old 02-25-2014, 09:56 AM   #1
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Stalling at idle

Hey guys so ive started to have an issue with my 99 9-3, initailly i would come to stop, either at a light or a stop sign, and occasionally the RPMs would suddenly dip very low before the car would catch it and bring the idle back up and everything would be fine again. More recently it begun to stall rather than just run rough for a second. Also it does not happen immediately after i come to a stop, normally ill come to a stop and 10-15 seconds after while idleing the issue will occur. Ive done a tune up recently and wasnt really sure where to start as far trying to resolve the issue other than the IAC but i wasnt sure if that would be it. Thank you for any help!!
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Old 02-25-2014, 12:27 PM   #2
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I would start with all the vacuum hoses and electrical connection to the IAC and throttle body. You might have knocked one off during the tune-up. Assumption is that you used the right NGK plug and plugged in MAF sensor, etc.

Next I would pull a battery connection and do adaption runs.

ETA: Check Intercooler hoses, etc
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Old 02-25-2014, 01:47 PM   #3
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Check for vacuum leaks, replace vacuum lines if you are unsure of there age. Super cheap.

When you say that you did a tune up, what do you mean?
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Old 02-25-2014, 03:28 PM   #4
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Quote:
Originally Posted by BuHuSPG View Post
Check for vacuum leaks, replace vacuum lines if you are unsure of there age. Super cheap.

When you say that you did a tune up, what do you mean?
Spark plugs, oil change, air filter, thermostat and gasket.
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Old 02-25-2014, 03:31 PM   #5
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Quote:
Originally Posted by oliversexpedition View Post
I would start with all the vacuum hoses and electrical connection to the IAC and throttle body. You might have knocked one off during the tune-up. Assumption is that you used the right NGK plug and plugged in MAF sensor, etc.

Next I would pull a battery connection and do adaption runs.

ETA: Check Intercooler hoses, etc
Ill check vacuum hoses, IAC connections, and possibly a BLt depending on weather on friday. Thank you for the suggestions. I believe i used to correct NGK plugs listed on this site somewhere, they were NGKs. I did not check/unplug the MAF but im not getting any CELs so im assuming its plugged in but ill double check that as well
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Old 02-26-2014, 02:29 PM   #6
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I took a gamble and a new Evap Purge Valve fixed my problem, same symptoms as you describe. My car would also die easily after I cracked the gas tank open to refill.

I had verified my system was vacuum leak free before trying the EPV, though.
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Old 02-27-2014, 04:13 AM   #7
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Quote:
Originally Posted by Viper588 View Post
Ill check vacuum hoses, IAC connections, and possibly a BLt depending on weather on friday. Thank you for the suggestions. I believe i used to correct NGK plugs listed on this site somewhere, they were NGKs. I did not check/unplug the MAF but im not getting any CELs so im assuming its plugged in but ill double check that as well
Unless you have a viggen, a 99 does not have a maf? Pull the iac and clean with carb cleaner, then shoot it with wd40
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