Question about 1990 Porsche 928

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Vacuum hose/line routing diagram for a 1989 Porsche 928S4

I got the car in with removed intake manifold and all vacuum lines removed! Since I don't have the ($1000.00!!!!) factory manual and there is no diagram under the hood, I'm slightly lost! Anybody can help?
Thanks guys!
Gary

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All of the manuals are available free for download:
http://www.ligeti.com/928/

Posted on Sep 15, 2015

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  • 76 Answers

Get the Morehouse PET CDs from 928sRUs.com . It's everything you need from parts lists to diagrams and it's cheap!

Posted on Nov 22, 2014

6 Suggested Answers

inf12
  • 13 Answers

SOURCE: intake manifold vacuum line

THIS IS FOR TURBO ENGINE
13b2405.jpg NON TURBO ENGINE
6781864.jpg

Posted on Feb 08, 2009

voodoomox
  • 1689 Answers

SOURCE: 86' Porsche 944 turbo

well it could be the seals, but also you may have to look at other sources of the oil, i have been reading this thread i found online and somehow the problem poster had almost the same as yours and was able to trace where the oil is coming from. here is the thread good luck, hope you get the culprit identified.

Oil Leak on Porsche 944 Turbo intake

Posted on Aug 03, 2008

MNfisherman
  • 11896 Answers

SOURCE: how to change the lower intake manifold and all

Go to autozone.com and register for free. Then you will have full free online repair manual with diagrams, how-to's, testing, replacing, locations, and more

Posted on Aug 05, 2009

  • 15 Answers

SOURCE: 1986 porsche 928 intake removal and replacement of sparkplugs.

You dont need to take off the intake manifold but the cold air intakes these unclip grab the convaluted tubing and pull it straight back out of the aircleaner then lift it up and un clip the bottom then pullit out of the intake snorkle

Posted on Sep 19, 2009

  • 507 Answers

SOURCE: 1987 Porsche 928S4...some fuses are not getting

check connections in back of fuse box to see if theyre getting power,if so you may need to clean everything(corrosion)if no power there trace back,may be fusable link,or junction further back

Posted on Oct 25, 2009

  • 194 Answers

SOURCE: How can i charge a porsche 911 carrera 4 1989

Do you have an owners Manual, it may have refferance to this type of problem, should it ever ocure.Also for in the future it might be a good idea to purchase a repair manual, Haynes or Chiltons are both very good repair manuals for the do it yourselfers, @ most Automotive Parts Stores cary them. However I would locate the starter on the vehicle and connect a jumper cable to the starter ( this would be the Red Positive cabls ) where the battery cable connects to the starter and the ground cable to a good grounding spot near by. Connect the other two cable leads to the battery you intend to put in the vehicle to replace the old one and this should get you into the trunk. Make sure when you hook the cable clamp to the positive termanel on the starter you do not come in contact with any other exposed wire terminals. Good Luck and Happy New Year. From Ernie @ RedDeer, Alberta, Canada.

Posted on Jan 01, 2011

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Intake manifold gasket


prev.gif next.gif Intake Manifold REMOVAL & INSTALLATION 1.9L SOHC Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Properly relieve the fuel system pressure.
  3. Drain the coolant system.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Air cleaner fresh air hose
    • Positive Crankcase Ventilation (PCV) valve hose
    • Fuel line from the rail
    • Throttle cable from the throttle body
    • Throttle cable bracket nuts
    • Fuel injector electrical connectors
    • Throttle Position (TP) sensor electrical connectors
    • Idle Air Control (IAC) valve electrical connectors
    • Manifold Absolute Pressure (MAP) sensor electrical connectors
    • Exhaust Gas Recirculation (EGR) valve electrical connectors
    • Heater hose from the intake manifold outlet
  5. Position the wiring harness over the brake master cylinder
  6. Remove or disconnect the following:
    • Intake manifold support bracket bolt
    • Label the vacuum line for proper assembly
    • Drive belt
    • Power steering pump
    • Upper intake manifold bolts
    • Evaporative Emissions (EVAP) canister purge valve solenoid vacuum hose
    • Brake booster vacuum hose
    • Lower intake manifold bolts
    • Intake manifold
    To install:
  7. Thoroughly clean all gasket mating surfaces. Be careful not to damage or score the aluminum surface. If replaced, use Loctite® 290, to seal the new PCV valve inlet tube into the manifold. NOTE: Refer to Section 1 of this manual for the intake manifold torque sequence illustration. The illustration is located after the Torque Specification Chart.
  8. Install or connect the following:
    • New gasket and manifold. Torque the nuts in sequence to 22 ft. lbs. (30 Nm).
    • Power steering pump. Torque the fasteners to 27 ft. lbs. (38 Nm).
    • Drive belt.
    • Heater hose and install the manifold support bracket bolt. Tighten the bolt to 22 ft. lbs. (30 Nm).
    • Lubricate the male ends of the fuel lines with a few drops of clean engine oil, then connect the fuel supply and return lines.
    • Fuel line(s) in the retaining bracket. Torque the mounting screw to 36 inch lbs. (4 Nm).
    • Throttle cable to the throttle body and attach the accelerator cable bracket. Torque the bolts to 22 ft. lbs. (30 Nm).
    • Reposition the wiring harness and connect the wiring and vacuum hoses to their original locations. The harness leads to the TP sensor and EGR solenoid must be routed between the intake manifold runners.
    • Negative battery cable
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  10. Prime the fuel system by cycling the ignition ON for 5 seconds and OFF for 10 seconds a few times without cranking the engine.
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1989 dodge Ramcharger stalls


Hi Monkeypaint!
I assume you have power brakes and I gather that it idles properly at times, but dies when the brakes are applied. This sound like a leaking power brake assist vacuum line or diaphram. You can verify this by locating the big vacuum hose connecting the intake manifold to the assist diaphram. This will be about an inch in diameter connected to the round item behind the brake master cylinder next to the firewall.
  1. Disconnect the line at the intake manifold end, and plug the vacuum port on the manifold with a tapered rubber stopper or cap.
  2. Being aware that you now do NOT have power assist to the brakes (requiring CONSIDERABLY more pedal pressure to stop!!!), see if the problem goes away. If it does, you have narrowed it down to the assist diaphram or the hose. If it still persists, it is an engine tuning/control issue, not related to brakes.
  3. Do determine whether it is the vacuum hose or the cannister, remove the previously installed cap/plug, reinstall the hose to the intake manifold, disconnect it from the diaphram and plug/cap the hose at that end. Repeat step three... if the problem returns, the hose is leaking and should be replaced... If the problem still goes away, the Power Brake Assist Diaphram Cannister is leaking excessively and should be replaced.
  • ***ALSO*** Any other vacuum lines leaking can lower the manifold vacuum to a threshold level where the load of power brake assist actuation crosses the line for adequate vacuum to idle*** So check all vacuum lines underhood, looking for a pronounced hissing at vacuum leaks. A manifold vacuum gauge is a relatively inexpensive diagnostic tool that could also be useful.
Well, hope this helps, and good luck! Don't forget to rate this answer!
Thanks!
-WB

Jun 15, 2008 | 1989 Dodge Ramcharger

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