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Thread: 76 corona issues

  1. #1
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    76 corona issues

    hey guys, relatively new to the boards. but ive got a 76 corona 4 door. with the 20r motor.

    the issue im having is that ive got no power and it wont get above 70mph.

    what i need to know is do the exhaust manifolds have the little damper things in them that open and close.

    when i run it, even for a short period. the manifold gets cherry red hot. which is making me think that im not getting all of my exhaust out.

    it pushes air though the muffler. but its not alot.

    im just curious if any of your cars do that as well, or if theres something more serious i need to be worrying about.

    thanks for any advice in advance guys.

  2. #2
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    Well the timing being WAY off could cause the hot issue,but i would disconnect the exhaust at the downpipe to check if the muffler is bad,because it could be that as well...It shouldn't be like that at all.And no,no valves in the exhaust.

  3. #3
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    if i set the timing any lower than what it is, it eats gas though.

    for that matter, what type of milage should i expect as well? right now its pushing about 11-15 mpg.

  4. #4
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    What is the timing set at? Is it points ignition? Compression check?Did you disconnect the exhaust and try it?Carb way rich?

    And my 22r in my corona does 20-30mpg with a Weber 32/36 and a pacesetter header..Depending on my mood

    :twisted: :twisted:

  5. #5
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    unsure on what the timing is set on. i adjust it via the bolt next to the distributer. its got points. no compression check, i lack the equipment.

    i did disconnect the exhaust, didnt do much. although its pretty much free flow anyway (no cat, resonator, etc) muffler is still good too.

    as far as teh carb goes. im pretty sure it needs to be rebuilt/replaced.
    when you mess with the air screw it doesnt change how it runs.

    you can definately feel the tourqe when you shift though. its just like its got no power. and it eats gas like a fat kid eats cake.

    maybe the 20r is just that underpowered?

  6. #6
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    Naw,My 20r ran just as good,if not better than the 22r in there now...

  7. #7
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    then im not really too sure. ive been playing with it for a few weeks now, and i cant seem to get the balance between power, milage, and top speed.

    i think ima have to actually take it to someone and let them do a tune up and see what happens.

  8. #8
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    your symptoms are classic of a car w/patially plugged exhaust....
    take it to COMPETENT exhaust shop for a backpressure test..
    it sounds like your catalyst [if your car has one] is starting to melt/
    plug up or there is debris in the muffler causing a "clog"..

    best of luck...

  9. #9
    Guest

    20R PROBLEMS

    MOST LIKELY YOUR CATALITIC CONVERTER IS CLOGED . OPEN THE CONNECTION OR CUT IT AND CHECK HOW IT RUNS , YOU CAN ALSO MAY HEAR A HISSING SOUND FROM THE MUFLER .

  10. #10
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    Quote Originally Posted by Brett.lakey
    although its pretty much free flow anyway (no cat, resonator, etc) muffler is still good too.
    Did you ^^^ guys read his post?

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