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intake manifold pressure? 200 1984

posted by  cguin on  Thu Apr 14 04:56 CST 2005
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last visit: Sat Jul 24 10:57 CST 2010
[RELATED]

Hi all,

My car is an intercooled 1984 245glt with 203K miles and I'm just starting to try to learn how to work on it a little myself.

What is the valve-lookin-thing that comes off the top of the intake manifold runner closest to the firewall? The hose attached to it has popped off a couple of times in the past couple of months... both times at start-up first thing in the morning. Does this mean the pressure in the intake manifold is too high? What are the likely causes?

I'm planning to take the manifold off to examine/clean the coolant temp sensor connection because of a high-idle-at-startup issue. What other maintenance/cleaning stuff should I think about doing at this time?

Thanks in advance!







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    intake manifold pressure? 200 1984

    posted by  kaperz81 on  Thu Apr 14 11:38 CST 2005
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    last visit: Wed Oct 15 14:06 CST 2014
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    If you are talking about the very small hose that has a one way valve on it, you are refering to the vacuum line that controls the inside vents. On a turbo car it is important to make sure all the vacuum connections have hose clamps, otherwise you will find all sorts of odd drivability and performance problems. I have been through these before and they are a pain to diagnose, and by replacing all the vacuum lines and making sure they were clamped helped a lot.

    If you are removing the manifold, now would be a good time to replace the wiring harness if it hasn't been done so already (the original crappy fall apart ones need replacing). I would also suggest cleaning out the manifold and throttle body and replacing all the vacuum hoses. You will be also be able to see the intake valves and how clean\dirty they are, which will help you decide if running some fuel injection cleaner and better fuel through the system is necessary in the coming months.

    If needed, it might also be a good time to replace the fuel injector seals, they are another cause of vacuum leaks that mystify one during troubleshooting of idle problems.

    Good luck,
    --
    Zack Silver 83' 242Ti (221k)








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      intake manifold pressure? 200 1984

      posted by  cguin on  Thu Apr 14 12:41 CST 2005
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      last visit: Sat Jul 24 10:57 CST 2010
      [RELATED]

      Thanks Zack.

      I thought maybe it was the vacuum line for the vents. But it seems strange. I don't have much experience at this stuff but intuitively it seems weird to me that a point that is supposed to be pulling vaccuum is actually building up pressure... What does this mean? Pressure build up like that doesn't seem like it would be very desireable...

      I think I will try replacing the injector seals as well as the manifold gasket. I read some posts here about how bad the fcp manifold gasket is--do you have any opinions on the subject?

      Thanks again,
      Corey







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