Thread: overheating - loss of power

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  1. #1 Re: overheating - loss of power 
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    Quote Originally Posted by grand prix newb View Post
    Thanks for all the files very helpfull, just got heads and parts back today, but machinist took out all bolts that helped me I dentify front and rear head and where the brackets and everything bolted on, I don't know which exhaust bolt was a bolt that fastens exhaust and had a bracket or something bolted on to it.
    I would send pictures but daughter forgot the cable to download pics.
    Mario
    Well she's moving right along.

    Heads with valve jobs:



    Progress ready for intake install:




    Got the exhaust almost on:



    1997 Grand Prix SE 3800 series 2
    No mods yet.
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  2. #2 Re: overheating - loss of power 
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    Are those the aluminum LIM gaskets? Cause from the pic they look black, like the plastic ones.

    Also, don't forget to put a dab of RTV in all four corners of the end seals for the LIM to block gaskets. I put some under the gasket, and then on top before seating the LIM. Never leaked again.
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  3. #3 Re: overheating - loss of power 
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    Quote Originally Posted by FordMan77 View Post
    Are those the aluminum LIM gaskets? Cause from the pic they look black, like the plastic ones.

    Also, don't forget to put a dab of RTV in all four corners of the end seals for the LIM to block gaskets. I put some under the gasket, and then on top before seating the LIM. Never leaked again.
    shoot I didn't put any on top just across the bottom, suppose I better do that now, dam I wish you caught me last night, been fastened since with thread lock, Thanks a lot though probbobly saved a big head ache down the road, rather pop of and give it a good rtv hit now then have to tare everything apart later, and yes sir they are the plastic gaskets (dam another thing I forgot about).
    Last edited by grand prix newb; 01-17-2011 at 03:14 PM.


    1997 Grand Prix SE 3800 series 2
    No mods yet.
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  4. #4 Re: overheating - loss of power 
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    I posted 7 minutes after your post that showed "Progress ready for intake install", where you still had the LIM off. Figured you'd see it in time.

    I'm not saying that it will leak if you only sealed the bottom part, just that I've always been told to put some at just the corners on top and bottom of those end seals where the seal meets the head and LIM. As long as the RTV is thick enough on the bottom part you might be ok, your call there.

    Although I wouldn't reinstall plastic LIM gaskets at all. There is a reason GM came up with the updated Alum. ones . I am actually surprised that they still make the plastic version after all the motors that have had this issue.
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  5. #5 Re: overheating - loss of power 
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    I will switch to alum ones later, right now I got a misfire in #4 cylinder, and car won't engage for 10 - 20 turns of ignition, is there away to disable anti theft system or is that a gm job. coolant level is good, but low coolant light flashes along with ses lght. 700.00 0n heads decked and ign. parts. Frustrating. here is a couple vids, sorry for being dark, daughter got here late with cam.
    Thanks

    http://s276.photobucket.com/albums/k...t=P1170179.mp4

    http://s276.photobucket.com/albums/k...t=P1170180.mp4
    Last edited by grand prix newb; 02-19-2011 at 12:06 AM.


    1997 Grand Prix SE 3800 series 2
    No mods yet.
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  6. #6 Re: overheating - loss of power 
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    Quote Originally Posted by grand prix newb View Post
    I will switch to alum ones later, right now I got a misfire in #4 cylinder, and car won't engage for 10 - 20 turns of ignition, is there away to disable anti theft system or is that a gm job. coolant level is good, but low coolant light flashes along with ses lght. 700.00 0n heads decked and ign. parts. Frustrating. here is a couple vids, sorry for being dark, daughter got here late with cam.
    Thanks
    97 GP SE :: P1170179.mp4 video by mariog207_2008 - Photobucket

    97 GP SE :: P1170180.mp4 video by mariog207_2008 - Photobucket
    Fixed I found the new little gasket that comes with the coils, I lost 1 so just took one out of my other coils didn't work, put the new one in and cool ses light isn't flashing anymore,still on but not flashing. start driving get 10 feet awqay and ses goes out. hesitates here and there.

    Still have to turn key a bunch of times before engine will turn over

    low coolant light on sometimes flashing,coolant level is good . Sensor? is that below the radiater cap?


    1997 Grand Prix SE 3800 series 2
    No mods yet.
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  7. #7 Re: overheating - loss of power 
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    When turning the key a bunch of times before it starts, does everything else in the car stay powered? I would check all your calbes going to the starter. Make sure they're all tight. Also check your cables at the battery. If that all looks good then may be the ignition switch.

    Yes, the sensor is below the cap and upper trans. line. Should have a square back on it. Might just be covered in dex crud. Pull it and clean it up then reinstall and see what you get.

    Also, it is known that these motors can be hard to bleed all the air from the cooling system, so even if it appears full, it may be low when being circulated via the waterpump. If cleaning the coolant level sensor doesn't help try bleeding the cooling system again, and then again, lol...

    The hesitation/miss could just be old plugs/wires. Are they new as well?
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