Sooo... I have been getting the two codes p0174 and p0171 which is lean in both banks. I have looked all over for vacuum leaks and checked pretty much all the hoses. I finally took it to the shop and they said my lower intake manifold gasket is leaking...which is like 500 bux to get done by them. So, I am going to try it myself. have any of you done this before? what should I look/ look out for? any tips?

thanks!

 

I did it on my 4.0 about a month ago b/c I replaced the o-rings on my fuel injectors. Not sure what the 3.0 looks like, but it wasn't too bad on the 4.0. More time consuming then anything. Be careful when you tighten the bolts back down. Label all the lines you take off.

 

ok, im stuck I took the plastic upper intake manifold off...now do I need to take the Valve covers off to get to the lower part? Im lost..

 

Before you go any farther you really should find a good manual first. Go look at your local library or pick up a Chilton.

 

3.0L Engine
Lower Manifold

1. Before servicing the vehicle, refer to the Precautions section.

2. Drain the engine cooling system.

3. Remove both the valve covers.

4. Disconnect the upper radiator hose, heater hose and coolant bypass hose.

5. Disconnect the engine coolant temperature (ECT) sensor and coolant temperature sender electrical connectors.

6. Disconnect the crankshaft position (CKP) sensor and detach the wiring from the stud bolt.

7. Disconnect the fuel injector electrical connectors and position the engine control wiring aside.

8. Release the fuel pressure and disconnect the fuel tube.

9. Loosen the rocker arm bolts.
NOTE
Identify the location of each pushrod. Each pushrod is to be installed in the original location to prevent premature wear.


10. Remove all the pushrods.

11. Remove the bolts from the lower intake manifold.
NOTE
Gently loosen the intake manifold to separate the silicone sealant from the cylinder block.


12. Remove the lower intake manifold.

13. Remove and discard the intake manifold gaskets and end seals.




Lower intake manifold torque sequence-3.0L engine
NOTE
Clean and inspect all mating surfaces.


NOTE
If the lower intake manifold is not installed within four minutes, remove the sealant and reapply.

1. Apply a drop of silicone gasket and sealant at the four cylinder block-to-cylinder head seams.

2. Install the intake manifold gaskets and end seals.

3. Position the lower intake manifold.

4. Install the bolts and tighten in the sequence shown to 21 ft. lbs. (29 Nm).

5. Install the pushrods.

6. Tighten the rocker arms to 24 ft. lbs. (32 Nm).

7. Connect the fuel tube.

8. Connect the fuel injector electrical connectors.

9. Connect the crankshaft position (CKP) sensor and attach the wiring from the stud bolt.

10. Connect the engine coolant temperature (ECT) sensor and coolant temperature sender electrical connectors.

11. Connect the upper radiator hose, heater hose and coolant bypass hose.

12. Install both valve covers.

13. Fill and bleed the engine cooling system.




Upper intake manifold torque sequence-3.0L engine

1. Before servicing the vehicle, refer to the Precautions section.

2. Disconnect the battery ground cable.

3. Remove the air cleaner outlet pipe.

4. Remove the bolt and the snow shield.

5. Disconnect the accelerator cable, speed control cable and the return spring.

6. Disconnect the accelerator cable and speed control cable from the accelerator bracket.

7. Disconnect the throttle position (TP) sensor and idle air control (IAC) valve electrical connectors.

8. Disconnect the two vacuum hoses.

9. Detach the 42-pin wiring harness retainer from the stud bolt.

10. Remove the nut and the stud bolt. Position the 42-pin wiring harness and bracket aside.

11. Remove the oil indicator tube bracket nut and the upper intake manifold support bracket stud bolt.

12. Disconnect the brake booster vacuum hose and the positive crankcase ventilation (PCV) valve tube.

13. Remove the bolts, the stud bolt and the upper intake manifold. Remove and discard the gaskets. Clean and inspect all mating surfaces.

14. To install, reverse the removal procedure. Install new gaskets and tighten the upper intake manifold bolts and stud bolt in the sequence shown, to 89 inch lbs. (10 Nm).

Compliments of Autozone.com....

 

man thanks sooooo much....your a life saver!!

 

thats a huge pita compared to the 4.0.

 

well still not done... this is driving me crazy! Why do you have to take the pushrod out anyway? hopefully I can finish up tomorrow. If your in the Dallas area feel free to drop by...please..lol

 

you need to take out the pushrod on number 3 and move the rocker arm to the side or else your not going to get the manifold off. be careful once you get this removed so you dont drop any dirt inside where the cam sits, and make sure you drain that radiator. or else if you get any of that crap in the cam or pushrods youll trash bearings.

 

The Haynes also says that you only need to pull the intake pushrod on cylinder 3. Why would you only need to pull one? Im picking up at this step tomorroW and want to make sure I do it right.

 

Do you have the manual repair?