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Thread: Glowing Exhaust Manifolds 1992 454 TBI 7.4L P30 Motorhome

  1. #46
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    the video is being updated on youtube to reduce shakiness. I do have the .pids files that the snap on verus puts out. I couldn't find any software on the web to open them.
    it might be a proprietary snap on format. But if someone has a way please let me know and i'll upload the files. Give it another few hours the shakiness should be reduced.

  2. #47
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    Here is another short, more steady, video I did today. This is without driving, revving engine up to 2000 RPM and seeing what there is to see.

    https://www.youtube.com/watch?v=TL8i...ature=youtu.be

  3. #48
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    Quote Originally Posted by Kaweh View Post
    Do you have a link to the right steel manifolds that you are referring to?
    I tripped over one at the junkyard today. I've seen a lot of this type on motor homes. I can only assume GM used these because iron cracks too easy at high temperatures.

  4. #49
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    Quote Originally Posted by jay72 View Post
    I tripped over one at the junkyard today. I've seen a lot of this type on motor homes. I can only assume GM used these because iron cracks too easy at high temperatures.
    Holding closed loop at higher loading can cause the manifolds to glow as well. This is what my coated stainless headers on my Express already look like. The coating is discolored, chalky looking, almost looks like it was torched with an acytelene torch. I am thinking it gets quite hot pushing a brick into the wind at 80-90 mph especially into a 20-30 mph headwind. Those are LT1 90* metal plug boot shields designed to reflect heat off the plug wires.

    Last edited by Fast355; 05-13-2015 at 05:30 AM.

  5. #50
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    I replaced the EGR valve last week and still the same problem persists. It made no difference although we did find a tiny tiny leak with the EGR that was only found when spratying starter fulitd right into from the bottom. But it was so tiny. Either way the same problem persists.

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