3.8l. What are torque specs for upper and lower plenum?

This says 20 ft lbs. Did you replace the gasket and use sealant?

https://www.justanswer.com/mitsubishi/btde2-plenum-removal-2007-endeavor-ye-having-problems-locating.html

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Intake Manifold Torque specs? - Maxima Forums

https://maxima.org > 4th-generation-maxima-1995-1999
Jan 25, 2017 - What do you torque the intake manifold to? ... My haynes manual says to torque the upper manifold bolts to 13-16 ft/lbs ... Supporting Maxima.org Member.
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https://blog.mrmetric.com/wp-content/uploads/2015/09/Torque-Relationship-Chart.png

Measure bolt diameter and hardness (stamped on head) use these specs.

Lower Intake:

1. Use a skin coat of RTV silicone on both sides of the water passage ports (outer most holes) and put the new lower intake gaskets into place
2. Hand tighten the 13mm head intake bolts and Torque the bolts , starting from the center and working your way out in a circular pattern
3. Torque these bolts in a few small increments until they have reached 250 inch pounds of torque.
4. Upper Intake Plenum:
5. When installing the intake air plenum , be sure to catch the four center bolts and the two side bolts (stiffener brackets) before tightening , The center bolts should be torqued to 250 inch pounds .The fuel rail bolts should be torqued to 100 inch pounds

What car and year?

Is your GM Truck with the 4 8L 5 3L or 6 0L engine experiencing rough idle... This may help, it includes various torque specs

intake manifold upper and lower 89 in. lbs.

Lower: Torque to 28 N·m (250 in. lbs.)

Upper: Torque to 12 N·m (105 in. lbs.)

Sequences below:





Good luck.

Lower intake bolts 11 ft. lbs start in the center of the intake and work your way out cross from side to side.Tighten the upper intake bolts with the same procedure with 89 inch pds.Be sure to apply threadlocker to the lower intake bolt threads.