Question about 1998 Ford Expedition

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Cannot identify leaking vacuum hose.

Cannot identify hose coming from the back of the throttle body to I dont know where??? It is some how related to the vacuum, and is leaking, needs to be replaced but dont want to go buy the wrong part!! Can someone help?

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Random misfires could be gas related- low fuel pressure, vacuum leaks or air leaks upsetting the air/fuel mixture ratio, clogged air filter or fuel filter. Could be ignition related- worn spark plugs, possibly. Or could be an internal mechanical problem-possible valve train malfunction.
Start with a fuel pressure test. check vacuum hoses for leaks, check intake manifold and throttle body assembly for leaks. If you have an exhaust leak at or near the engine, can cause misfires. Air going into the engine is metered by the mass air flow sensor in the big air boot on the throttle body. If extra air gets into the engine through a vacuum leak or a loose hose, the engine computer won't know it, so the air/fuel mixture will be too lean, resulting in misfiring. Several things to check-good luck.



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There is no carburetor on any of the 6 cylinder or 8 cylinder Jeep Grand Cherokees. They have Fuel Injection and a throttle body which looks like a carburetor scaled down.

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Instructions on how to remove and replace the throttle body follow:

Throttle Body REMOVAL & INSTALLATION
  1. Disconnect the negative battery cable.
  2. Remove the vacuum hoses from upper bonnet, unfasten the retaining clips and remove the upper bonnet assembly.
  3. Remove the lower bonnet retaining bolts and lower bonnet.
  4. Remove the throttle cable and the return spring.
  5. Disengage the wire harness connector from the injector.
  6. Disengage the wire harness connector from the WOT switch, ISA motor and TPS.
  7. Disconnect the fuel supply and return lines from the throttle body.
  8. Tag and disengage the vacuum hoses from the throttle body assembly.
  9. Disengage the potentiometer wire connector.
  10. Loosen throttle body retaining bolts and remove throttle body assembly from the intake manifold. To install:
  11. Clean the intake manifold and throttle body mating surfaces of old gasket material.
  12. Install a new gasket and the throttle body assembly. Tighten the mounting bolts to 16 ft. lbs. (21 Nm).
  13. Engage the potentiometer wire connector.
  14. Engage the vacuum hoses to the throttle body.
  15. Engage the fuel lines to the throttle body.
  16. Engage the WOT switch, ISA motor, TPS, and injector electrical connections.
  17. Install the return spring and throttle cable.
  18. Install the lower bonnet and fasten the retainers.
  19. Install the upper bonnet assembly, retaining clips and vacuum hoses.
  20. Connect the negative battery cable.
  21. Start the vehicle and check for fuel leaks. Fig. 1: Exploded view of the throttle body and related components 86745g41.gif
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Where can u find a vacumm system outline


common faults related to this are the top hoses on engine block and the inlet manifold gasket as the bolts are subject to corrosion from the water ways. Idle the car and spray detector spray around the inlet manifold to see if there is a change in engine note. also look to hoses from MAF unit to throttle body. Check all electrical plugs to the air/fuel system as bad connections can affect the performance of individual units. hope this helps - good luck.

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When i start the engine it will run at about 3000rpm .i checked the cables at the carb and the gas.what else could it be pedal


Check for vacuum leaks. Check PCV hose and other vacuum hoses. Spray carb cleaner around intake, throttle body and vacuum hoses while idling in park. If spraying anywhere causes a change in idle. that area has a vacuum leak.
Possible IAC motor dirty or defective. Remove it. Clean the IAC plunger tip and the throttle body passages with air intake/throttle body cleaner spray can. Reassemble and start vehicle.

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The check engine indicator of my 1998 honda civic is always on and the idling keeps at 1500 rpm. what's the possible problem ? is it possible that idling problem is cause of a defective computer box?


Generally this would be related to either a vacuum leak, an idle speed control motor or a throttle positioin sensor. The computer uses these things to determine where to set the idle at after interpreting all of the data "sensed". You can check for vacuum leaks with a can of carburetor cleaner by sprayng a small amount using the extension tube, near the vacuum connections and the throttle body and air intake components. IF you spray a small amount at a time you won't have a potential fire hazard. When carb cleaner is sucked in through a vacuum leak, the engine slows down & this will identify a spefic location or hose.

You could stop by your local parts store & probably get a free scan for the check engine light & that could indicate more readily what a problem could be. good luck

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