Finding a Vacuum Leak
Thread Starter
Instructor
Joined: Apr 2004
Posts: 200
Likes: 0
From: Manahawkin NJ
Finding a Vacuum Leak
I'm still getting a very choppy idle, and a very low cold temperature idle. I think my carburetor is running too lean but I think it is due to my oxygen sensor (81) and I bought a new one but haven't installed it yet.
But I also think there is a vacuum leak somewhere. How on earth to I determine it's location?
But I also think there is a vacuum leak somewhere. How on earth to I determine it's location?
Drifting
Joined: Sep 2001
Posts: 1,427
Likes: 1
From: Boxford Mass
You should by a hand operated vacuum pump. They should come with every c3.
Then, you need an accurate vacuum diagram for your car.
Now you can isolate sections of the system and determine if they hold a vacuum. Its tedious work, but not too complicated. Its amazing where these systems lose vacuum from & how easy it is to fix.
Then, you need an accurate vacuum diagram for your car.
Now you can isolate sections of the system and determine if they hold a vacuum. Its tedious work, but not too complicated. Its amazing where these systems lose vacuum from & how easy it is to fix.
Instructor
Joined: Jul 2004
Posts: 106
Likes: 0
From: Brandon Mississippi
Originally Posted by OneBrokenSmile07
I'm still getting a very choppy idle, and a very low cold temperature idle. I think my carburetor is running too lean but I think it is due to my oxygen sensor (81) and I bought a new one but haven't installed it yet.
But I also think there is a vacuum leak somewhere. How on earth to I determine it's location?
But I also think there is a vacuum leak somewhere. How on earth to I determine it's location?
Hey this will take a little time but .....worth it to find the problem
GOOD LUCK!!!
Le Mans Master
Joined: Mar 2002
Posts: 8,575
Likes: 3
From: On an island surrounded by sharks Hawaii
My 82 had a little broken hose located near the driver's side fenderwell that connected with a bigger hose that connected to the PCV. Because the hose was broken it caused a high idle, once I replaced the broken hose with a new one the idle came back to normal.
Safety Car
Joined: Jul 2002
Posts: 4,269
Likes: 3
From: St. Charles IL
Cruise-In 5-6-7-8-9-11-12 Veteran
A CI-6 Car Show Winner
If your vacuum leak is not related to accessories (removing and plugging the lines made no difference), go around the intake manifold gaskets with starting fluid while the engine is running. Increase in rpm will indicate a leak.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Jack71
You should by a hand operated vacuum pump. They should come with every c3.
Then, you need an accurate vacuum diagram for your car.
Now you can isolate sections of the system and determine if they hold a vacuum. Its tedious work, but not too complicated. Its amazing where these systems lose vacuum from & how easy it is to fix.
Then, you need an accurate vacuum diagram for your car.
Now you can isolate sections of the system and determine if they hold a vacuum. Its tedious work, but not too complicated. Its amazing where these systems lose vacuum from & how easy it is to fix.
Very true. A good car specific vacuum diagram and wiring diagram are a must if you do your own work.
