Common questions

What is the vacuum line routing for a Jeep engine?

What is the vacuum line routing for a Jeep engine?

Newer vehicles (starting first in California, and later in all states) instead vent these vapors into — you guessed it — the intake air flow via a charcoal canister. 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.

What kind of vacuum line does a Jeep Grand Wagoneer use?

Here is a poor-quality scan of the V8 vacuum diagram from a 1984-85 FSJ manual. Here are two more poor-quality scans of the V8 vacuum diagram from a 1989 V8 Grand Wagoneer with heavy duty and light duty cooling packages. Here is another scan detailing the 1978 EVAP (charcoal) canister ports.

How does the vacuum advance work on a Jeep Cherokee?

There are several different methods that Jeep employed to implement the vacuum advance feature, but it essentially works like this: A CTO (coolant temperature override) switch uses engine coolant to sense when the engine has warmed up.

What kind of engine did a 1970 GM Truck have?

Fig. 5: Vacuum hose schematic – 1977 305 engine, heavy duty emissions Fig. 6: Vacuum hose schematic – 1977 350 engine, light duty high altitude and California emissions Access our GM Full-Size Trucks 1970-1979 Vacuum Diagrams Repair Guide by creating an account or signing into your AutoZone Rewards account.

Newer vehicles (starting first in California, and later in all states) instead vent these vapors into — you guessed it — the intake air flow via a charcoal canister. 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.

Here is a poor-quality scan of the V8 vacuum diagram from a 1984-85 FSJ manual. Here are two more poor-quality scans of the V8 vacuum diagram from a 1989 V8 Grand Wagoneer with heavy duty and light duty cooling packages. Here is another scan detailing the 1978 EVAP (charcoal) canister ports.

How to repair a Jeep Wrangler YJ vacuum schematic?

Fig. 6: Emission control vacuum schematic-1992 with 4.0L engine Access our Jeep Wrangler-YJ 1987-1995 Vacuum Diagrams Repair Guide by creating an account or signing into your AutoZone Rewards account. Once you sign in, follow these instructions to access our Repair Guides. Add your vehicle in Manage My Vehicles.

There are several different methods that Jeep employed to implement the vacuum advance feature, but it essentially works like this: A CTO (coolant temperature override) switch uses engine coolant to sense when the engine has warmed up.

Author Image
Ruth Doyle