Changeing valve cover gaskets on a 92 sho 3.0 dohc

Discussion in 'Gen 1 & 2 - Engine, Exhaust, Drive Line & AC syste' started by Wferguson167, Jul 8, 2020.

  1. Wferguson167

    Wferguson167 New Member

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    What happens when you hear a whistle from the engine after changing the valve cover gaskets
     
  2. luigisho

    luigisho SHO Member

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    If you didn't change any belt paths maybe vacuum leak. Is it running differently other than the noise?
     
  3. Wferguson167

    Wferguson167 New Member

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    It's running rather crazy and it smells like a fuel filter so I'm going to change that as well
     
  4. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Did you disconnect the fuel lines at the rails when you did the valve cover gaskets?
     
  5. Wferguson167

    Wferguson167 New Member

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    I had someone else change them so I will check in the morning! How many vacuum hoses and fuel lines are there ?
     
  6. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Two fuel lines. One is the feed and the other is the return. When I do valve cover gaskets I lift off the fuel rails to get better access to the rear cover. Maybe your mechanic did the same and now one or more injectors are leaking.

    There are several vacuum lines. Might be easier to try and spot a nipple that should have a hose attached to it.
     
  7. luigisho

    luigisho SHO Member

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    There are several vacuum lines and it could also be a misalignment or gasket not sealing somewhere. Check posts 34 and 35 in this thread. There are video with audio links to his car making noises. I would check all the obvious places where it looks like a hose would go and I would also remove and reseat the intake manifold. When you put it back on, if you take it off as 1 piece, you have to loosen the couplers between the intake runners so there is a little bit of flex. This allows it to seat properly and flush on the heads below. Then you tighten it back up.

    Also if the injectors had the original oring seals and it is possible to have one damaged when it went back in or just not seal correctly.
     
    Last edited: Jul 9, 2020
  8. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    No link posted.
     
  9. luigisho

    luigisho SHO Member

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    Devin and Irish Pride like this.
  10. BaySHO Performance

    BaySHO Performance SHO Member

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    So, changing the valve cover gaskets.... To do that, the fuel rails don't get removed, nor the fuel lines disconnected. All that needs to happen is a couple of 10mm bolts need to be removed that hold the lines onto the back cover so that they can be swung out of the way. Problem can't be anything to do with the fuel system. Of course, the mechanic may have done something different, but it's pretty obvious what needs to be done once in there.

    I've worked on over 250 SHOs over the last 20 years. NEVER have I loosened off the intake couplers when reinstalling the manifold. It's perfectly lined up as is. The only time I leave them loose is when installing the intake after replacing the couplers so that everything lines up.
     
    PaulTAutoX likes this.

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