Subject	I had my car on a scope when it failed smog last.
Posted by	MrPulldown(Tahoe) on January 22, 2013 at 3:10 PM
	This message has been viewed 139 times.
In Reply To	Fan Clutch ? posted by MrPulldown(Tahoe) on January 22, 2013 at 12:50 PM
Message	Seems that at a prolonged idle my car was running at 170 degree. The manual calls for 190 operating temp. Was wondering if the fan clutch could have been the issue. Seemed to work ok but wasn't sure. I jsut replaced it with a "good" used clutched. My car failed emmisions at idle. The scope pointed out that the O2 were reading rich and not cycling at idle. I also have UD pulley with Hi Water pump pulley.
Follow Ups	Fan Clutch ? - MrPulldown(Tahoe) 12:50:03 01/22/13 It will always be spinning. (n/m) - Woody75 (Denver) 12:56:43 01/22/13 Re: It will always be spinning. - MrPulldown(Tahoe) 13:14:33 01/22/13 A clutch fan is belt driven and will always spin - white22sky 13:18:24 01/22/13 always spinning - JaffaUK 13:18:59 01/22/13 Thanks. (n/m) - MrPulldown(Tahoe) 14:36:44 01/22/13 I think it expands and will slip less when hot (n/m) - njz 14:57:20 01/22/13 Correct. As engine/bay temp rises, so does fan speed. - Multi_Read (MO) 16:33:33 01/22/13 I had my car on a scope when it failed smog last. - MrPulldown(Tahoe) 15:10:11 01/22/13 your O2 sensors aren't supposed to cycle at idle - aliaZ 15:14:48 01/22/13 I think this is up to debate - MrPulldown(Tahoe) 15:56:26 01/22/13 He knows it does, but running cool will run rich at idle. - TriniTT 16:06:35 01/22/13 I'm trying. Am hoping this new fan clutch does it. - MrPulldown(Tahoe) 16:29:46 01/22/13 Thermostat. (n/m) - TriniTT 17:11:04 01/22/13 ^^^ Thermostat (n/m) - njz 18:13:09 01/22/13 The FSM says to rev to around 2000 RPM to test the O2 - aliaZ 17:28:29 01/22/13 My thermostat was replaced 15k ago. - MrPulldown(Tahoe) 18:13:58 01/22/13 what part of the emissions test did you fail? - aliaZ 18:48:28 01/22/13 Co (n/m) - MrPulldown(Tahoe) 11:14:53 01/23/13 Re: My thermostat was replaced 15k ago. - hmb 18:48:33 01/22/13 My AIV is fully functional. (n/m) - MrPulldown(Tahoe) 11:15:36 01/23/13 I passed w/o AIVs several times - BlackholeZ 13:14:18 01/23/13 Passed with a stock ECU, or an upgraded ECU? (n/m) - hmb 13:46:25 01/23/13 Both - AIV only effects cold start idle (n/m) - Bernie (NoVA) 14:15:02 01/23/13 Stock NA, Ash TT (n/m) - BlackholeZ 02:50:33 01/24/13 They spin and they spin and they spin and they spinnin! (n/m) - boileralum 14:18:00 01/23/13
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