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'72+ e-body firewall...what are those things? #1065562 08/30/11 02:11 AM 08/30/11 02:11 AM
Joined: Jan 2003 Posts: 6,085 NotRussia 2 2fast4yourBrain OP Whack top Dodger
2fast4yourBrain OP Whack top Dodger 2 Joined: Jan 2003 Posts: 6,085 NotRussia	Always wondered what those two things on the firewall are for??? 70 318 Chally vert FC7/XW (sold) 06 300c SRT8 04 2500 QCLB 4x4 HO 1971 BMW 2800CS 1955 Nomad 1970 280SL

Re: '72+ e-body firewall...what are those things? [Re: 2fast4yourBrain] #1065563 08/30/11 07:30 AM 08/30/11 07:30 AM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	IIRC that's the NOX emission system, also found on some 71 Cali cars

Re: '72+ e-body firewall...what are those things? [Re: DAYCLONA] #1065564 08/30/11 08:07 AM 08/30/11 08:07 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: IIRC that's the NOX emission system, also found on some 71 Cali cars N-95 cars

Re: '72+ e-body firewall...what are those things? [Re: 2fast4yourBrain] #1065565 08/30/11 10:08 AM 08/30/11 10:08 AM
Joined: Jun 2008 Posts: 1,822 Colorado D denfireguy top fuel
denfireguy top fuel D Joined: Jun 2008 Posts: 1,822 Colorado	The device on the left is the temperature control for the EGR valve. It stops pulling exhaust gas through the intake manifold when the engine reaches operating temperature. The one on the right is Oriface Spark Advance Control (OSAC) valve. It limits advance to the distributer until the engine warms up. Craig Last edited by denfireguy; 08/30/11 10:11 AM. 2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado

Re: '72+ e-body firewall...what are those things? [Re: denfireguy] #1065566 08/30/11 04:45 PM 08/30/11 04:45 PM
Joined: Nov 2004 Posts: 182 Columbia, Missouri D dtedler member
dtedler member D Joined: Nov 2004 Posts: 182 Columbia, Missouri	Look at that photo? Was that a factory location for the coil? I've never seen one mounted that way before.

Re: '72+ e-body firewall...what are those things? [Re: denfireguy] #1065567 08/30/11 05:00 PM 08/30/11 05:00 PM
Joined: Oct 2006 Posts: 7,369 Iowa burdar Owen's Dad
burdar Owen's Dad Joined: Oct 2006 Posts: 7,369 Iowa	Quote: The device on the left is the temperature control for the EGR valve. It stops pulling exhaust gas through the intake manifold when the engine reaches operating temperature. The one on the right is Oriface Spark Advance Control (OSAC) valve. It limits advance to the distributer until the engine warms up. How sure are you that this is correct? The EGR control valve (I thought) stopped the EGR valve from opening when the engine was cold. It let the valve open once the engine was up to temp. I thought I read that the OSAC valve delays the spark advance. Once the throttle is depressed, the spark isn't advanced for 3-5 seconds. I believe ALL 73 and 74 cars got the OSAC (NOX)valve.(318 and 340/360) In 73 it was mounded on the firewall. In 74 it was moved to the air cleaner. Only 318's got the EGR control valve.(in 73 at least) 340's didn't get an EGR valve in 73. Please correct me if I'm wrong. Only early 73's had the temp valve mounted on the firewall. Later cars had it moved somewhere else. Even the 340 cars didn't have that block-off plate on the firewall. That hole wasn't even punched on the later cars.

Re: '72+ e-body firewall...what are those things? [Re: burdar] #1065568 08/30/11 05:11 PM 08/30/11 05:11 PM
Joined: Oct 2006 Posts: 7,369 Iowa burdar Owen's Dad
burdar Owen's Dad Joined: Oct 2006 Posts: 7,369 Iowa	http://www.allpar.com/mopar/emissions.html It says in this link that the NOX valve delays the advance by 15 seconds...not the 3-5 seconds that I posted above. As far as the smaller EGR control valve, 74's also used a temp valve on the radiator. The one on the firewall must not be temp sensitive but must just delay the vacume signal to the EGR valve.

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