Question about 1998 Oldsmobile Intrigue

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I have a 1998 Olds Intrigue. Just had a tune up and replaced the upper intake manifold. Now I am getting a code that says the fuel is running too lean, Service Engine Light stays on. Also, When sitting in traffic, temperature guage rises to about 3/4, when I start moving again, it comes back down. Could the fuel issue be a result of the tune up (possibly PCV Valve?) or is it more likely the fuel pump?

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  • sardes Oct 01, 2010

    There are no vacuum leaks, that was specifically checked, any other suggestions?

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  • Oldsmobile Master
  • 8,531 Answers

Lean condition is a result of vacuum leaks, possibly at gaskets of upper manifold. You can check by spraying ether or carb cleaner at the gaskets with engine running. If engine revs at all, remove manifold to ensure gaskets properly installed.

Overheating: Make sure cable was reattached to temp sensor, and check for fan operation when engine gets hot.

if you have more questions, please let us know.

Posted on Oct 01, 2010

  • Jeffrey Turcotte
    Jeffrey Turcotte Oct 01, 2010

    Here are the causes of P0171: Intake/exhaust leak, AIR system, MAF/VAF sensor, fuel
    pressure/pump, injector(s), HO2S

    Might want to check mass airflow connector and sensor. If dirty, clean with electronic spray cleaner--do not touch the sensor. Can't think of anything else related to the work that was done. Suppose it could be a new and unrelated problem, like O2 sensor failure.

  • sardes Oct 01, 2010

    Thanks

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I have a 1998 Olds Intrigue.The problem that I'm having is a misfires , lost power, white smoke ,trouble starting.


Sounds like you might have an Intake Manifold gasket issue. Pull the spark plugs and look for a plug that looks Brand New Clean. that will tell you hat you are getting Coolant into that cylinder

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I have a 98 Olds Intrigue. It is leaking coolant and water from somwhere on the passenger side of the motor. Replaced water pump and radiator is fine. Any ideas?


Depending on what engine you have, the 3.8 has a plastic elbow coming out of the lower intake manifold that goes to the belt tensioner assembly, which has 2 hoses coming out of it for the heater hoses. That elbow likes to crack. The older 3.8 has a nipple there which also likes to crack that runs to the heater core. Either way that's where i'd be checking first.

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#3 CYLINDER IS FULL OF FEUL AND TRUCK WILL NOT START.REMOVED SPARK PLUGS AND GAS POURS ON GROUND WHEN KEY IS TURNED ON FROM #3 CYLINDER PLUG HOLE.


The Vortec engines were notorious for those kind of problems. The problem will be under the upper-intake manifold, and the fuel injector assembly will either have a cracked plastic fuel line running out to one or more of the fuel injectors, or the fuel pressure regulator that is located on the end of the fuel injector assembly is faulty or it has detached from the fuel injector assembly. Either way the lower intake manifold will be flooded with fuel anytime that the fuel pump runs.

There were two types made, the first type had fuel lines that connected to the lower intake manifold, and then from the metal fittings the fuel line turns into plastic and runs inside the lower intake manifold and under the upper-intake manifold where it runs over to the fuel injector assembly, and this type can really flood out an engine when it becomes faulty.

The second type had metal fuel lines running over the upper intake manifold and they connected to the top of the fuel injector assembly, however, under the upper-intake manifold there are still plastic lines to the fuel injectors and also the fuel pressure regulator that could be faulty and cause the engine to severely flood.

The upper-intake manifold is not that difficult to remove, and after you remove the upper-intake manifold then (replace the fuel lines to the fuel injector assembly if it is the second type) turn the ignition to the "Run" position and when the fuel pump runs you should see where the fuel is leaking/spraying from, and it will most likely be a large high pressure leak from a ruptured plastic fuel line.

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Intake manifold gasket / replace


3.8L Engine

NOTE The 3.8L (VIN K) non-supercharged engine uses a two-piece intake manifold consisting of an upper air plenum which mounts the throttle body and a lower intake manifold assembly which houses the fuel injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower intake manifold. The supercharger serves as the upper manifold.
Lower Manifold

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold similar to the 3.8L (VIN K), but the supercharger serves as the upper manifold.
  1. Disconnect the negative battery cable.
  2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
  3. Remove the upper intake manifold using the procedure above.
  4. Remove the EGR outlet pipe from the intake manifold.
  5. Detach the engine coolant temperature sensor wiring harness from the sensor.
  6. Remove the lower intake manifold bolts and carefully lift off the manifold.

To install:


0900c15280269f1b.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine
  1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces and between the lower manifold and the cylinder heads..
  2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Apply thread-locking compound to the bolt threads. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence, starting in the center, then working outwards in a circle.
  3. Install the remaining components in the reverse order of the removal process.

Upper Intake Manifold (Plenum)
  1. Disconnect the negative battery cable.
  2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
  3. Tag for identification, then remove the right side spark plug wires.
  4. Disconnect the ignition wires from the fuel rail.
  5. Remove the fuel rail. Please see Section 5.
  6. Remove the cable bracket from the intake manifold.
  7. Remove the throttle body.


NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold.
  1. Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.



0900c15280269f1c.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
To install:
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  3. Install the remaining components in the reverse order of the removal process.

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