I am 100% sure the head bolts should be bought new because back when the motor was assembled, the bolts were torqued causing them to be streached a little. The new ones will have never been torqued so the new will be able for you to exactly torque them. I don't know about the harmonic balancer. The head bolts I have seen are mildly expensive . I can tell you are being cautious and thats the way to approach this job No offense to the other replies , I am still confused why I had to switch the gaskets . I know the first set did not match up between the head and the intake runner manifold housing.I am tempted to run it back thru advances's records so I can unwind the puzzle too
Question About 96' Upper Intake Plenum Gasket
- Thread starter KC96LSC
- Start date
Curious , What 2 fixed positions do the IMRC housing with a shaft hold the valve plates ? When my passenger side IMRcontroll vac over electric, was broke the computer set a lean code. Sounds like the plates were closed all the time. Niow that its replaced what are the 2 positions it operates . Is it just lean and rich?
Reading some other posts , a Guy by the name of Psycho Star. Exerienced the same mix up when he bought the gaskets except he has an explanation of what he feel caused the confusion. Now i have another member who says the same thing I previously told the board. Its happened to other guys too
KC96LSC
Dedicated LVC Member
Good points Bill, I'm going to get some good shots/pics of my set up and do a close comparison, Thanks guys.
Hi, when the intake manifold runner controls are correctly operating for the 1996 mk 8 what 2 positions do they set the plates? I suspect non operational they are closed,lean, and open when the imrc is working correctly. Mine set a lean code when it was broke so i guess it was shut resulting in lean mix. I may have this confused with the t.body doing this mix but I believed the imrc plates when working do this mix. Sorry for the rude response, I get stubborn when I am very sure I am right but too much of this makes for hard feelings with other people. I have found this web site has divided the country into regions and I am in Ohio .
unity
Dedicated LVC Member
Bill, the IMRC are always open and always closed. By that I mean when one "plate" is closed, its companion is then open. So at any given point 8 plates are open, 8 plates are closed. So the actuators simply have two positions. There is no lean/rich condition since they are only redirecting the air path between short and long runners. However, if an actuator fails it can cause issues since there will be an imbalances between the two sides of the engine. Also people do like to say they "open" at 3k RPM, but like I said, they are always open. I think under 3k is the short runners and over 3k rpm is the long runners.
chris2523
93 Mark VIII
at any given point, 8 plates are either open or closed, and, well thats it, there are only 8 plates.
no companion plates.
they do not redirect air per say, they just block the short runners until 3000+ rpm when they open and allow air through the short secondary runners.
under 3k is long runners, over 3k is both runners.
no companion plates.
they do not redirect air per say, they just block the short runners until 3000+ rpm when they open and allow air through the short secondary runners.
under 3k is long runners, over 3k is both runners.
You're first class. Thanks for your help brother.