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Discussion Starter · #22 ·
okay. I may venture into taking it off to see what I can possibly do. Should be fun!
 

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Discussion Starter · #24 ·
The upper intake manifold is composite not metal all throughout. Im guessing the composite meand that the black plastic on the outside is all the plastic it has and then the inside of it is metal.
 

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Discussion Starter · #26 ·
well gerald said its in his 04 so it may be a few years of it. They put composite in it for lower costs and take extra weight off. Now I want to play around with it! lol
 

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My upper intake manifold is also plastic/ composite. But I also have a 4.0 OHV and its a 96. A friend of mine has a 93 or 94 with a 4.0 OHV as well, except his has a all metal intake manifold.
 

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Discussion Starter · #29 ·
They used it on the 4.0 for much longer than the 3.0.
 

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Discussion Starter · #35 ·
Okay, I had a pretty productive day with my upper and lower intake and throttle body after a failed junkyard run. Heres what my day was like...

First off I disconnected everything from my composite upper intake manifold and took it off the engine.



When I had that off I went ahead and soaked the crap out of it in throttle body cleaner. I bought 4 cans for all of this and the upper intake manifold too 2 1/2 cans worth. Heres some comparison of the before and after of the upper intake...
BEFORE



AFTER


And then I worked on cleaning the top end of the lower intake manifold.
BEFORE



AFTER



Then I went on to continue my plans with the throttle body. I wanted to trip off some of the pin in the throttle body to allow more air to flow with less restriction that would create turbulance. Sooo, I worked on it and ended up with this



This is the little piece that came out. May be little but it did make a difference in acceleration when speed is already up.



So, I had to clear codes and drive it a lot after I put everything back on because there was still a bit of cleaner in the lower intake. No big, it just caused a lot of misfiring and took 10 minutes of hard running to burn it all clean. Now with a cleaner intake manifold and the extra room for air to pass in the throttle body it is preforming a little better. Actually more than I thought since I figured I wouldnt feel a thing. Took me 4 hours from the start of taking it apart to firing it back up. Not bad for a days work.
 

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Discussion Starter · #37 ·
thanks man. Thats the first time ive ever taken the manifold off. Learned a lot about my engine today!
 

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Discussion Starter · #39 ·
Good on the engine to clean it like that! I do that for the upper and lower intakes and then the seafoam on the rest of then engine. Clean as a whistle!
 
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