What should I have done/do myself?
Thread Starter
3rd Gear
Joined: Sep 2001
Posts: 3
Likes: 0
What should I have done/do myself?
I just aquired a 78' SC Targa that has not been registered for about 1.5 years and has been only driven 7-8 times during that period. I drove it home and put approx. 75 miles on it the next day around town. At first it seemed to idle fast 1800-2000 when coming to a stop but towards the end of the day the idle would be 750-500 and stall when coming to a stop.
What do you think?
What do you think?
Instructor
Joined: Jun 2001
Posts: 209
Likes: 2
From: Outer Space
For a start, I'd say your motor has some problems with the CIS ("Confounded" Injection System).
Mr. Bill Gregory wrote an excellent essay on the subject for the benefit of us all.
I believe it is available on the Technical section of this website. Read it, it may help you understand this quirky part of the pre-'84 cars.
One other thing that comes to mind, is the distributor advance mechanisim. If the bob-weights are frozen up or sticky in any way, you may experience an irregular idle. (And no one likes to be "irregular" do we?)
Mr. Bill Gregory wrote an excellent essay on the subject for the benefit of us all.
I believe it is available on the Technical section of this website. Read it, it may help you understand this quirky part of the pre-'84 cars.
One other thing that comes to mind, is the distributor advance mechanisim. If the bob-weights are frozen up or sticky in any way, you may experience an irregular idle. (And no one likes to be "irregular" do we?)
Instructor
Joined: May 2001
Posts: 111
Likes: 1
You are waking this car up from sleep. Do the standard things you should do to baseline the car. Fresh gas now. New fuel/oil/air filters, fresh oil and trans fluid, new rotor all the way to plugs. Perform a valve job.
For your condition, you are experiencing the effects of the deceleration valve. That *might* be what is making your car, when hot, idle high. Typically one loosens the locknut on this device and turns the threaded post into the body of the valve. Then, set you idle using the large, quarter-sized idle screw on the throttle body.
Study all the drawings and whatnot via BillG's writeup, check Pelican parts diagrams, and get a feel for your car. Let us know what happens.
Jw
For your condition, you are experiencing the effects of the deceleration valve. That *might* be what is making your car, when hot, idle high. Typically one loosens the locknut on this device and turns the threaded post into the body of the valve. Then, set you idle using the large, quarter-sized idle screw on the throttle body.
Study all the drawings and whatnot via BillG's writeup, check Pelican parts diagrams, and get a feel for your car. Let us know what happens.
Jw
