Hey all, my car (as many of you know) is a 71 Dart 4dr. My question is pertaining to an interesting piece of equipment that I found shortly after purchasing the car way back when. I have since had Ceej, and D.I. look at it, and between the 3 of us, we could not figure out what its purpose is.

I went searching through the forum and didnt find anything, so if anyone already has a post, point me in the right direction.


Basically, where the speedo cable comes out of the firewall, it drops down around 5-6", where it goes into a coupler of some kind, and there is a black wire that comes out of the coupler, goes way over to the passenger side upper firewall where it connects to a Vacuum and electronic gadget, and then goes back into the wiring loom. I could not find anything in the Haynes manual (such a big help it is anyways right?). D.I suggested that it was an EGR service indicator, whose function is to light the EGR light on the dash after approx 60k miles. That made sense, except, I dont have an EGR light. I have an OIL light, and a BRAKE SYSTEM light. My instrument cluster is the non-rally style with horizontal speedo gauge, and seperate LIGHT and WIPER controls.

So what is it for?

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

There was nothing such as EGR in '71. EGR didn't start til '72, and that year it was in California only and consisted of...a hole. A single hole, that's it, the whole system was made up of one hole in a jet screwed into the manifold floor, passing from the intake to the exhaust side. It allowed exhaust into the intake tract whenever the engine was running. Really bad system; totally killed mileage, performance, and driveability. The valve-controlled EGR system came along in 1973. Much better than the '72 floor jet mess. There is no EGR light on the dash in '73, either; that didn't come along until much later.

Back to your '71: The device you found is part of a California-only NOx emission control system that blocked vacuum spark advance below certain road speeds and/or when the trans is in particular gears. Get rid of it; it's costing you gas money and time (waiting for the car to accelerate). Run the vacuum hose directly from the carburetor's vacuum spark advance port to the distributor vacuum advance can, and connect the speedo cable directly to the speedometer.

Oh, and toss the Haynes book in the trash where it can never hurt anyone again. Get the real factory service manual.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

I thought it might be NOx... it looked a lot like the late EGR timers...
interesting...
He doesn't have the hoses hooked to the vacc. mechanism, so he's OK... I'm not sure if he has enough length on the primary speedo cable to make it to the cluster...he might need a new standard length cable for that one...

-D.idiot

It's gonna need another cable for sure.


Thanks Dan!

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

I removed that from our car. I cut a short piece of hose (maybe 1/4") and used it as a spacer between the two cables, then screwed them together without the transducer. Without something like this the connection will be loose and ruin the inner cables. A new cable would be best.

That also has it's own wiring harness plugged in at the ballast resister and running to a control box on the passenger side firewall. Get rid of all of it!