Your donations help keep this valuable resource free and growing. Thank you.
|
egr question for Pacer 258 engine |
Post Reply | Page <12 |
Author | |
FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
Post Options
Thanks(0)
|
I have never seen my 1977 232 (which is a very similar engine configuration to your own) knock without its EGR, even when I advanced the timing way up and it was running lean. It takes a lot to make one of these engines knock. If you run EGR, you will need the CTO. A cold engine will not like having exhaust dumped into it's intake. It will hesitate and bog at best, backfire and stall at worst. If your Pacer is a 1975 or 1976, the backpressure transducer is a separate part from the EGR valve. It is a plate that bolts between the AGR valve and the exhaust manifold that has a tube coming from it and a diaphragm-looking thing. The way that system should be plumbed is: carburetor ported vacuum from the "E" port on the carburetor goes to the CTO, then from the CTO it goes to the BP transducer (I'm not sure which end), then finally to the EGR valve. The proper EGR valve will stay open if you apply vacuum to it then seal off the vacuum. However, the transducer should leak vacuum if you apply vacuum to one side of it while sealing off the other side. It needs backpressure from the running engine to actually seal and pass vacuum to the EGR valve. If your Pacer is 1977 or newer, the EGR valve has the backpressure transducer built-in. The vacuum line from the CTO simply plugs into the EGR valve. The proper EGR valve for this system will not hold vacuum. If you apply vacuum to it, the vacuum will just leak out. It needs backpressure from the engine to hold vacuum and cause it to open. |
|
1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
|
dodgemahal
AMC Apprentice Joined: Dec/11/2015 Location: Illinois Status: Offline Points: 48 |
Post Options
Thanks(0)
|
Junkie, thank-you! That is some seriously great literature......I'm learning a good deal from you and others and I love it. Love the car too.
|
|
amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1075 |
Post Options
Thanks(0)
|
so, op, what year is your Pacer? gz
we really can't help a lot without some engine specifics.
|
|
george z
|
|
dodgemahal
AMC Apprentice Joined: Dec/11/2015 Location: Illinois Status: Offline Points: 48 |
Post Options
Thanks(0)
|
MY 76, 258 1 barrel carb. Thanks.
|
|
amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1075 |
Post Options
Thanks(0)
|
hi, look under "ported vacuum switch", good luck, gz
|
|
george z
|
|
FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
Post Options
Thanks(0)
|
The correct vacuum nipple for the EGR on your carburetor is on the passenger's side of the carb. Literally sticks straight out towards the valve cover. The other nipple on the passenger side that sticks out angled towards the front more is for the distributor advance. And you may have another nipple on the driver's side of the carburetor. That one is manifold vacuum and was usually used for the Air Guard (smog pump system) diverter valve.
|
|
1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
|
Post Reply | Page <12 |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |