Question about 1989 Cadillac Fleetwood

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I am looking for a vacuum diagram for a 307 oldsmobile engine to see where vacuum hoses run to and from because intake manifold had been done on my car but all hoses were not put back in place where they were.

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  • Anonymous Apr 05, 2009

    the car will start but will not stay started



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Posted on Jan 02, 2017

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SOURCE: Vacuum diagram for 4A-F engine

hmmmm... im not expert in these kind of problem but... try to replace the diagram? it is possible?

Posted on Jun 19, 2008

  • 5158 Answers

SOURCE: hoses

if you are lucky there will be a sticker on the hood when you open it.... look up.... it will have at least some of the routing of the vacuum hoses. if not your next best bet is to go to the public library and look thru a manual.... search their database for chilton or haynes


Posted on Sep 24, 2008

  • 409 Answers

SOURCE: Engine Vacuum Diagram

Go to they have the vacuum diagrams you need. It's a good subscription to have if you plan to do your own repairs.

Posted on Feb 13, 2009

  • 161 Answers

SOURCE: Carb vacuum diagram for 1984 toyota 4x4 22r

these things are not available online due to copyright restrictions. you must get a paper manual.

Posted on Jun 11, 2009

michigan man
  • 3533 Answers

SOURCE: I have a 1987 Cadillac Brougham with a 5.0L

the best thing for you to do is stop by your local Cadillac dealership in the parts department and they be able to print you off pictures and diagrams showing you where they go if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car Merry Christmas & Happy New Year as always wish you the best of luck Michigan Man.

Posted on Dec 21, 2009

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I would look at the MAP sensor Manifold absolute pressure .
All vacuum comes off the intake manifold its the draw of air the engine needs to run .If the Map is bad you will have A LOT of of problems with how that engine runs ,It plugs in to the intake manifold 3 wire about 75 dollars maybe slightly less its a good place to start .

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Replace no 3 coil

if im not mistaken the number 3 coil is on the right hand side of the motor so you will need to remove the intake manifold to gain access to it.
Intake Manifold Removal
  1. Remove the engine cover (if equipped).
  2. Remove the air filter outlet pipe.
  3. Remove the positive crankcase ventilation hose.
  4. Remove the air cleaner resonator.
  5. Disconnect the throttle body electrical connectors.
  6. Disconnect the electrical connectors.
  7. Detach the vacuum hoses.
    • Press the retaining ring. (1)
    • Detach the vacuum hose. (2)

  8. Disconnect the vacuum hose.
  9. Detach the injector harness electrical connector from the intake manifold support bracket.
  10. Remove the intake manifold support bracket.
  11. Detach the engine wiring harness bracket.
  12. Detach the intake manifold support bracket.

    NOTE: Remove and discard the O-ring seal.
  13. Detach the throttle body.
    • Remove the retaining bolts.
  14. Remove the intake manifold.
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Am looking for a vacuum diagram for a 1998 oldsmobile lss. Not sure if there is a vacuum line that came loose somewhere but I am running out of ideas for why the engine idles eraticaly and stalls out when...

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I need a vacuum line diagram fo a 1996 Chevy Lumina, 3.1. One line that is not connected to anything, is located at the top of the engine.

Sorry I don't have the diagram, but I do have a diagram of the engine and component locations. Your vacuum system is fairly simple. You have a MAP sensor attached to the air cleaner. I have pasted a picture below. It has one electrical connector and one vacuum hose that goes to the intake manifold or the throttle body.
Behind the right headlight is your evap canister. This will have a hose or line running to the fuel tank. Then it will have another hose going to the purge valve. The purge valve should be close by and it has a connector plus another hose that goes to the intake manifold.
Then you have the PCV hose that goes from the PCV valve in the valve cover to the air cleaner or intake manifold. I think yours just has a hose from the air cleaner and the rest is internal.
There is one more vacuum hose, and that is the bog one that goes from the intake manifold (or throttle body--looks to me like there are a couple of vacuum ports on the back side of the throttle body, and there may be a "T" on one of the hoses) to the brake booster. It this one was off, the engine would not run, as the vacuum draw is large. Please let me know if you cannot figure it out from these instructions and provide a picture, if you can.

MAP sensor:

purge valve:


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I have an Aurora.. It is not idling correctly. It sometimes will not shift gears until the 3000 RPMs, and it tries to die when you come to a stop. I have had the transmission rebuilt and replaced, the fly...

These symptoms indicate a vacuum leak. Check all vacuum lines attached to the engine intake manifold--especially any that go to the transmission. Check both ends with the engine running for tight connections and listen for leaks. Also look carefully over the intake manifold for any missing hoses--a port on the manifold that is sucking air. Let me know if you have questions and thanks for using FixYa.

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Check engine light on code reads p2096 what

Fuel trim too lean. Usually means vacuum leak. Look for crushed,broken or melted off vacuum hoses near intake manifold. Or an obvious hissing noise at a normal idle. If so replace or repair clear codes your done. If not obvious take carb cleaner spray with nozzle attached car running & go over all vacuum hoses,intake manifold,egr valve see if idle raises if so you found leak. Repair. Could also be bad oxygen sensor switching bad o2 sensor but rarely.

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