C3 Idel Stop Solenoid

[John H.]

I have a quadrajet 7042203 base 350 manual tm. 1972 Coupe
The top of my carb was possibly replaced jJan.13,1978. Yes I kept a diary.
I am the original owner. I'm getting ready for a regional Feb. in Louisiana
flight juding and I am unable to ATTACH the Idel Stop Solenoid bracket to the
carb as preffered. The top lid of the current carb. does not have the
protrusion on the front or side for the bracket to grasp. Braket # 42682.
This is my original solenoid and bracket.
When I place the braket againist the front of the carb., the plungger on the
solenoid is rather far from the linkage. Even when it is energized.
I found out today that the plunger on the solenoid can be unscrewed counter
clockwise to lengthen it's throw.Is that correct.
What my question is, could my Carter carb, be original without the
bracket protrusions on the top of the carb, or are all tops for 1972 2203's
installed with these protrusions. Thanks Big John (Original PPPPPPPaint)

[Patrick H.]

Re: C3 Idel Stop Solenoid

John,

They all originally had the protrusions that you would need to mount the solenoid. Ideally, you'd like to find a top to install on yours that has the protrusion. Odds are, your original is long gone, right?

Patrick

[george romano]

Re: C3 Idel Stop Solenoid

Patrick is right, they all had the keyhole shaped attachment bung on the front of the carb, a square bung on the drivers side of the top, and along with this, there was a phillips head screw to hold the bracket as well. The screw actually threads into a hole in the main body of the carb.

The idle speed is adjusted by turning the hex shaped plunger in or out. If the plunger isn't long enough to reach the throttle linkage, its most likely due to the fact that the bracket is not mounted to the carb correctly.

George

[Jack H.]

Hum....

All the '71-72 CEC/TCS mounting bracket attaching screws I've seen are black oxide, flared fillister head, slot fasteners. Bracket for solenoid is same as that used with CEC system in '71 (now GM/Rochester discontinued).

Original carbs came from two approved sources (Rochester and Carter) and other advice given regarding air horn bracket mounting + body drilled & tapped for bracket attaching screw are on the money in my book!

[george romano]

Re: Hum....

So you're saying I'm a little screwey? LOL

I'll check into that for ya!

George

[Robert C.]

Re: You Check #s for the Carb?Date? *NM*

[george romano]

Re: Hum....

I looked in the IFI book today for a flared fillister head screw, but couldn't find anything, slot or phillips. Anyone have a picture of one of these puppies? It could be that I just missed it, or the description may be wrong.
George

[Harmon C.]

Re: Hum....

It is special as it centers the bracket as it is tightened.

[george romano]

Re: Hum....

How does it do this? Is there a shoulder on the underside of the head, or is it a countersunk hole in the bracket?

George

[John H.]

C3 IDEL STOP SPLENOID FOLLOWUP

I am the original msg sender re mounting solenoid.
I checked my records and just spoke to mechanic who did work on carb
on 1-13-79 by Roger Aiple, Metairie LA. Car had 62,630 miles it at the time.
Records show carb top was replaced, for some performance reason. At that
time solenoid was removed and saved.
Roger the mechanic said last night that he probably has the top, since he is a carb. not. I hope to hook up with him and get it back.
The comments about the mounting screw is interesting since I have seen a
phlipps type screw on another car just last week. I would have thought it
should be slotted, I don't know.
I did notice that the screw hole opening does taper down after a couple of turns
then it becomes one size for any more turns.
What is the correct type screw? What does a judge say?

[Patrick H.]

Re: 1972 Idle StopSolenoid FOLLOWUP

Lyle has it right.

Straight slot screw, tapered under the head (which is rather fat for the thread diameter), and a short length of actual threads. It has a black oxide finish.

I have never personally seen them available anywhere but on a car or with a purchased carb.

The original top to your carb can either be straightened, as some will do, or actually "milled" flat. Various repair shops do each method. I would search the Archives for Jerry Luck's phone number, and have him straighten the top AND ask him about a screw. He also has "thicker-than-stock" top gaskets that will also provide a better seal.

Patrick