Thanks for the vacuum tip. I'll look there. Maybe pull the carb and check the manifold gasket. I figure it had to idle good back in 66 for the price paid then.
I'ts probably something simple.
-------------- Original message --------------
From: randalpark@xxxxxxx
Well, it should idle smooth whether the A/C is on or not. Having the A/C on would slow it down a little. It the idle speed is too slow, it will cause the engine to die. It could sputter a little bit before that.
Since you stated that it didn't run very well without the air on, I am going to suggest looking for a vacuum leak. Doing all of the things you have done should have eliminated most ignition related sources for this problem, as long as they were done correctly. Incorrect ignition wire routing, idle mixture setting, timing, point gap, & spark plug gap can all do the same thing, but I will assume that those things were done right. Check all of the vacuum lines, connections, and diaphrams. Also, check the base of the carburator and the intake manifold gaskets for leaks.
By doing the compression test, you pretty much eliminated mechanical problems, other than perhaps a sloppy distributor drive, so ignition and carburation are basically what is left. Symptoms of either mimick each other, making it tricky to diagnose.
That car should be smooth as silk at idle. If it isn't something is wrong.
Paul W.
-----Original Message-----
From: mjusten@xxxxxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Sun, 16 Jul 2006 9:10 AM
Subject: IML: 66 Imperial IDLE Quality
Hi Everyone
I bought a 66 2dr Crown over a year ago from southern California. It has always had a 'Poor Idle'. When you turn on the A/C, it's awful. Short after the purchase, i installed a rebuilt compressor, new receiver/drier, and new expansion valve. The air is working well now, but I don't like using because of the idle.
I just took a compression test and all 8 cylinders were between 140 and 150. The carb was rebuilt just prior to my purchase. I have recently done a full tuneup including plugs, wires, points, and condensor. Recent dual exhaust also.
The engine takes off great and accelerates well. Runs COOL, doesn't ping, other exhibit any other performance issues.
This car has the CAP system. I have by-passed the system and still can't get any improvement.
Any suggestions?
Marty
66 Crown 2DR
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