Where is the vacuum line on a V8?
In these V8 diagrams, the vacuum line to the base of the carb on the manifold actually indicates ported vacuum, not manifold vacuum. Yes, it’s confusing. Also, in these diagrams “10-20-40” and “10-25-45” indicate FSJ’s, while “80” indicates a CJ.
How to check the length of the vacuum line?
Allow your car to idle for a couple of minutes. Your gauge should read between 14 and 18 inches of vacuum. If the reading is low or non-existent, there’s a blockage or leak in the vacuum line. Visually check the entire length of the hose for the problem. My truck has a rough idle but when I remove the vacuum line it smooths out. Why is this?
Where can I find a vacuum diagram repair guide?
Enter your vehicle details. Click the “View More” button, and then click “Vehicle Repair Guides.” Select the chapter “Vacuum Diagrams Repair Guide”.
Where do I get the vacuum hose routing diagram?
I got the Vacuum Hose Routing Diagram from this forum (included below), but it would seem that the terminology used differs slightly from the descriptions used by parts suppliers when I search on the part numbers. Therefore can someone please confirm whether or not I have correctly identified the valves from the part numbers on my car?
In these V8 diagrams, the vacuum line to the base of the carb on the manifold actually indicates ported vacuum, not manifold vacuum. Yes, it’s confusing. Also, in these diagrams “10-20-40” and “10-25-45” indicate FSJ’s, while “80” indicates a CJ.
How do you get a vacuum diagram for free?
Vacuum Diagrams This is not an automated service. Each Diagram that is requested has to be hand selected and sent. As this is a free service it receives an overwhelming amount of requests and may take up to a week or longer for a response. Just submit a request for the Vacuum diagram you want.
When did the I6 engine get a vacuum line?
The above image is the vacuum diagram for both the 1977 I6 engine. This system first arrived in California FSJ and all CJ models, and was later added to 49-state FSJ’s. Most distributors from this era have several simultaneous methods of advancing the ignition timing.
When did they start using vacuum lines for engines?
One of the most confusing aspects to tuning up an engine from the late 1970’s and 1980’s is all the early attempts manufacturers made to improve emissions with various vacuum-operated devices.
Which is the delay valve on a vacuum line?
If your EGR vacuum line has a red & blue delay valve in it, the blue side should point toward the EGR valve and the red side should point toward the CTO switch. The crankcase on an engine will slowly build up positive pressure.