MustangWorks.com : Ford Forums - View Single Post

mustangman4 · 12-29-2003, 01:26 PM

The EGR valve needs to open going down the road just cruising around and in theory will open about 15 sec into a WOT run down the track trying to keep emision levels low. If EGR opens at an idle you will get a lean condition. Thats why with what is mentioned above when you are running a supercharger or even N/A high horse combos you dont want an uncontrolled gas coming into the combustion chamber when at WOT. Otherwise it may turn ugly if you dont tune around it(ex. richen up strategy at wot to save the engine.) In all actuallity EGR will not open just reving it up in the driveway. You would actually have to put a vacum gauge on it driving down the highway to tell whether or not the EVR(EGR Valve Regulator) is comanding on the EGR valve. You can simulate this effect in the driveway. Go to the parts store and rent a hand vacum pump and attach it to the EGR valve. When you pull vacum at an idle the car should die. Bring up idle a bit and pull about 10in of vacum. The car should rough up for a bit but then smooth out once the 02 sensors catch up. Another thing to check would be EGR Valve Position Sensor voltage on the feed and return side. The feed should be 5v reference and the return side to the ECU will vary by applying the vacum pump. As far as the EVR goes I have really never seen one go bad. It works similar to a Idle Air Control valve. 12v input from the ECU varying in voltage depending how much EGR the ECU needs. Be sure to check the input vacum source. Not that the line is pinched off or broken somewhere it should be manifold vacum at that point. Make sure it is plumbed correctly and that it is wired correctly not that the TAB and TAD solenoid wires are connected to it. Those would be on the strut tower right next to the EVR. Thermactor Air Bypass and Thermactor Air Diverter used for the smog pump located below the alternator. If you choose to skip the whole process and just want the car to run remove the egr from the manifold and block the hole. But make sure to leave the EGR and EVP connected to not set the check engine light on again. I think anything beyond that is going to start looking at 02 sensor voltage, wiring, ect temp, act temp, and vacum line routing. Hope this helps. I do have more info if you need it.

Brad

12-29-2003, 01:26 PM	#2
mustangman4 Registered Member Join Date: Feb 2003 Location: Oshkosh WI Posts: 69	The EGR valve needs to open going down the road just cruising around and in theory will open about 15 sec into a WOT run down the track trying to keep emision levels low. If EGR opens at an idle you will get a lean condition. Thats why with what is mentioned above when you are running a supercharger or even N/A high horse combos you dont want an uncontrolled gas coming into the combustion chamber when at WOT. Otherwise it may turn ugly if you dont tune around it(ex. richen up strategy at wot to save the engine.) In all actuallity EGR will not open just reving it up in the driveway. You would actually have to put a vacum gauge on it driving down the highway to tell whether or not the EVR(EGR Valve Regulator) is comanding on the EGR valve. You can simulate this effect in the driveway. Go to the parts store and rent a hand vacum pump and attach it to the EGR valve. When you pull vacum at an idle the car should die. Bring up idle a bit and pull about 10in of vacum. The car should rough up for a bit but then smooth out once the 02 sensors catch up. Another thing to check would be EGR Valve Position Sensor voltage on the feed and return side. The feed should be 5v reference and the return side to the ECU will vary by applying the vacum pump. As far as the EVR goes I have really never seen one go bad. It works similar to a Idle Air Control valve. 12v input from the ECU varying in voltage depending how much EGR the ECU needs. Be sure to check the input vacum source. Not that the line is pinched off or broken somewhere it should be manifold vacum at that point. Make sure it is plumbed correctly and that it is wired correctly not that the TAB and TAD solenoid wires are connected to it. Those would be on the strut tower right next to the EVR. Thermactor Air Bypass and Thermactor Air Diverter used for the smog pump located below the alternator. If you choose to skip the whole process and just want the car to run remove the egr from the manifold and block the hole. But make sure to leave the EGR and EVP connected to not set the check engine light on again. I think anything beyond that is going to start looking at 02 sensor voltage, wiring, ect temp, act temp, and vacum line routing. Hope this helps. I do have more info if you need it. Brad __________________ 93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes, 55lb low imp inj, 80mm Pro-M meter, 2004 PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Trying to tune.