Question about 1996 Volvo 850

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There is an electronic components located in the air line between the air intake and the engine. It does not seem to be functioning it just hums when the ignition is turned on and the vehicle will not start. I have search for this part but am not sure exactly what it is called. Any Help?

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That sounds like your idle air valve. On 1994 to 1997 850 models, it does hum as it is pulsed on. If it is broken and stuck shut, it may still hum.
FCP Euro Genuine Replacement

Posted on Oct 22, 2013

  • _-__-___-_
    _-__-___-_ Oct 22, 2013

    fixing cars with no manuals, now that is a hard job. not saying exactly what hums, makek any answer a pure guess. The car has an ISC and will hum. key on, all non stepper motor type, ISC hum, mine hums at 200HZ, its a modulated ISC< called PWM method(ASE class learning) Ok so again why not DIAGNOSE it? start by ANSWERING my first question. DOES the engine crank at full speed, cranking, ?????

  • _-__-___-_
    _-__-___-_ Oct 22, 2013

    1 tiny step for man kind......


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Its the coil

Posted on Jan 01, 2014

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Will not start, or will not CRANK? be clear here.
its a Volvo, (ghastly. and no more mommy" where is volvo today?)
what county was it sold,or where are you if same.?
cars vary by country, (to the extreme)
USA answering... and lots of guessing... no photo part, makes this
100% harder. but..
buy the FSM used, on fraudbay.
go to and its there.'
i see it there , so can you.

if it dont crank, hot wire the starter, with good charged battery
jumper start it. does it crank now.
lets say, its good cranking no start car.
the fiirs test is for spark
check spark at all 4 spark plugs, using a new real spark plug for car.
in fact now do that 60k mile tuneup you missed, 100k meters.

Posted on Oct 15, 2013

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(see Figure 14)
The 3.1L engine is equipped with upper and lower intake manifolds. The upper intake manifold is also known as the intake manifold plenum.

CAUTION The fuel system is under pressure and must be properly relieved before disconnecting the fuel lines. Failure to properly relieve the fuel system pressure can lead to personal injury and component damage.
  1. Relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Remove top half of the air cleaner assembly and throttle body duct.
  4. Drain and recycle the engine coolant.
  5. Disconnect the EGR pipe from exhaust manifold.
  6. Remove the serpentine belt.
  7. Remove the brake vacuum pipe at the intake plenum.
  8. Disconnect the control cables from the throttle body and intake plenum mounting bracket.
  9. Remove the power steering lines at the alternator bracket.
  10. Remove the alternator.
  11. Label and disconnect the ignition wires from the spark plugs and wire retainers on the intake plenum.
  12. Remove the ignition assembly and the EVAP canister purge solenoid together.

Fig. 14: View of the intake manifold and related components

  1. Disconnect the upper engine wiring harness connectors at the following components:
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  3. Disconnect the MAP sensor from upper intake manifold.
  4. Remove the upper intake plenum mounting bolts and lift off the plenum.
  5. Disconnect the fuel lines from the fuel rail and bracket.
  6. Install engine support fixture special tool J 28467-A or an equivalent.
  7. Remove the right side engine mount.
  8. Remove the power steering mounting bolts and support the pump out of the way without disconnecting the power steering lines.
  9. Disconnect the coolant inlet pipe from the outlet housing.
  10. Remove the coolant bypass hose from the water pump and the cylinder head.
  11. Disconnect the upper radiator hose at thermostat housing.
  12. Remove the thermostat housing.
  13. Remove both rocker arm covers.
  14. Remove the lower intake manifold bolts. Make sure the washers on the four center bolts are installed in their original locations.
When removing the valve train components they should be kept in order for installation the original locations.
  1. Remove the rocker arm retaining nuts or bolts and extract the rocker arms and pushrods.
  2. Remove the intake manifold from the engine. Remove and discard the gasket.
  3. Using a suitable scraper, clean gasket material from all mating surfaces. Remove all excess RTV sealant from front and rear ridges of cylinder block
To install:
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  2. Using a new gasket, place the intake manifold on the engine.
  3. Install the pushrods in their original locations. Coat the pushrods with prelube.
The intake pushrods are marked yellow (5 3 /4 inch long) and the exhaust are green (6 inches long). Make sure the pushrods are properly seated in the valve lifters and rocker arms.
  1. Position the rocker arms in there original locations and tighten to specifications. Refer to the procedure earlier in this section.
  2. Install lower the intake manifold attaching bolts. Apply sealant 12345739 (or equivalent thread locking compound) to the threads of bolts. Tighten the vertical bolts first then the diagonal bolts to 115 inch lbs. (13 Nm).
  3. Install the front rocker arm cover.
  4. Install the thermostat housing.
  5. Connect the upper radiator hose to the thermostat housing.
  6. Fasten the coolant inlet pipe to thermostat housing.
  7. Connect coolant bypass pipe at the water pump and cylinder head.
  8. Install the power steering pump in the mounting bracket.
  9. Loosely install the serpentine belt.
  10. Connect the right side engine mount.
  11. Remove the special engine support tool.
  12. Fasten the fuel lines to fuel rail and bracket.
  13. Install the upper intake manifold and tighten the mounting bolts to 18 ft. lbs. (25 Nm).
  14. Install the MAP sensor.
  15. Connect the upper engine wiring harness connectors to the related components removed earlier.
  16. Connect the vacuum lines to the PCV, vacuum modulator and fuel pressure regulator.
  17. Install the EVAP canister purge solenoid and ignition assembly.
  18. Install the alternator assembly.
  19. Connect the power steering line to the alternator bracket.
  20. Install the serpentine belt.
  21. Connect the spark plug wires to the spark plugs and intake plenum wire retainer.
  22. Install the EGR pipe to the exhaust manifold.
  23. Attach the control cables to the throttle body lever and upper intake plenum mounting bracket.
  24. Install air intake assembly and top half of the air cleaner assembly.
  25. Install the brake vacuum pipe.
  26. Fill the cooling system.
  27. Connect the negative battery cable, then start the vehicle and verify that there are no leaks.


Hope helps.

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Fig. 2: Overhead view of the (A) automatic idle speed motor, (B) MAP sensor, (C) crankshaft position sensor wiring harness, (D) air temperature sensor, and (E) throttle position sensor - 1992 Cherokee with the 4.0L engine shown 91074p15.jpg
Fig. 3: Electronic engine control component locations - 4.0L engine shown 91074g08.gif
Fig. 4: Electronic engine control component locations - 5.2L and 5.9L engines (Part 1 of 2) 91074g05.gif
Fig. 5: Electronic engine control component locations - 5.2L and 5.9L engines (Part 2 of 2) 91074g06.gif
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