Intake manifold gasket replacement?

I am attaching the info for replacing the manifold gasket. Also, here is a guide that will help confirm a vacuum leak which you can use to test the gasket:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let us know what questions you have. Thanks

Good afternoon,

Yes, it could be the vacuum leak from the intake. I posted the procedure and pictures below for you.

https://www.2carpros.com/articles/replace-intake-manifold-gasket

Roy

Intake Manifold Replacement

Removal Procedure

Important: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.

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1. Remove the engine sight shield and retainer.
2. Relieve the fuel system pressure.
3. Disconnect the cruise control cable from the throttle blade stud.
4. Remove the cruise control cable from the bracket.

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5. Remove the accelerator control cable from the throttle blade.
6. Remove the accelerator control cable from the bracket.

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7. Disconnect the following electrical connectors:
Main ignition coil harness (2).
Fuel injectors (3)
8. Disconnect the wiring harness clips (1) from the fuel rail.

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9. Disconnect the following electrical connectors:
Main ignition coil harness (1)
Fuel injectors (3)
Exhaust gas recirculation (EGR) valve (4)
10. Disconnect the harness clips (2) from the fuel rail.

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11. Disconnect the following electrical connectors:
Manifold absolute pressure (MAP) sensor (1)
Knock sensor (2)
12. Remove the knock sensor harness electrical connector from the intake manifold.
13. Set the electrical harness aside.

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14. Disconnect the following electrical connectors:
Throttle Position (TP) sensor, if equipped
Electronic Throttle Control (ETC) motor, if equipped
Idle Air Control (IAC) valve

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15. Disconnect the following electrical connectors:
Purge solenoid (1)
Generator (3)
16. Remove the wiring harness bracket nut.
17. Remove the harness bracket from the stud.
18. Reposition the engine wiring harness.

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19. Reposition the coolant air bleed hose at the throttle body.
20. Remove the coolant air bleed hose from the throttle body.

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21. Reposition the radiator vent inlet hose clamp at the throttle body.
22. Remove the radiator vent inlet hose from the throttle body.

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23. Remove the Positive Crankcase Ventilation (PVC) hose from the throttle body and rocker arm cover.

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24. Remove the PCV hose (with valve) from the intake manifold and rocker arm cover.

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25. Remove the following EGR pipe bolts:
Intake manifold (1)
Cylinder head (2)
Exhaust manifold (3)

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26. Remove the EGR pipe (with valve).
27. Remove the EGR pipe gasket from the exhaust manifold.
28. If equipped, remove the vacuum brake booster hose from the rear of the intake manifold.

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29. Remove the Evaporative Emission (EVAP) purge solenoid vent tube by performing the following:
29.1. Remove the EVAP tube end (2) from the solenoid (1).
29.2. Squeeze the EVAP pipe quick connect fitting (3) retainer together.
29.3. Remove the EVAP tube end (3) from the vapor pipe.
30. Disconnect the fuel line quick connect fittings.

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31. Remove the intake manifold bolts.
32. Remove the intake manifold.

The only way to be sure is to perform a compression test on the cylinders. If compression is OK, then intake gasket.

Get that oil out if contaminated with coolant.

Compression test is always the first test. A cooling system pressure test would work, but if head gasket is bad, coolant could get into cylinders and hydro-lock the engine.

Check to make sure the fuel pressure is within spec. Also, check to make sure the regulator is working properly. If that is all good, check to make sure the injectors are getting power.

Did you use a torque wrench that is in calibration and use the corect tighteningpattern and torque for it. It may have a bad vacuum leak. You can check for a leak with a piece of sewing thread by dragging along mated surfaces until it gets sucked in towards leak.

Make sure you mark EVERYTHING you remove. And don't remove things that aren't necessary to remove.

Be careful with the new gasket and make sure the mating surfaces are clean and for gods sake dont over torque the bolts.