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1980 mercury monarch 1st gear only
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zerothenone
Novice
Oct 9, 2012, 2:10 PM
Post #1 of 10
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1980 mercury monarch 1st gear only
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1980
mercury
monarch
unknown size
50246 miles
car cant shift from first even at high rpm, sound of air coming out of what i think to believe is the carborator
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nickwarner
Veteran
/ Moderator
Oct 9, 2012, 2:14 PM
Post #2 of 10
(1503 views)
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Re: 1980 mercury monarch 1st gear only
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That sound is a vacuum leak. You need to find out where it is. Should be some vacuum line running to the trans and I'd be every inch of the 32 year old vacuum hoses on the whole car are shot. Get them all changed. You buy it in bulk at the parts store, get about 5 feet each of several sizes and do one at a time. Also, what is the fluid level at? If you move the shift selector manually will it go to the next gear?
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zerothenone
Novice
Oct 9, 2012, 2:38 PM
Post #3 of 10
(1486 views)
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Re: 1980 mercury monarch 1st gear only
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did not try the manual shift idea and the fluids are just below the top notch of the full line it just happened for the first time today as well so its new to me
(This post was edited by zerothenone on Oct 9, 2012, 2:39 PM)
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nickwarner
Veteran
/ Moderator
Oct 9, 2012, 3:13 PM
Post #4 of 10
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Re: 1980 mercury monarch 1st gear only
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This car has done a lot of sitting in its life and both lot rot and vermin can do bad things to a car left sitting. Did you just recently buy the car? Do you know how long its been stored?
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zerothenone
Novice
Oct 9, 2012, 3:54 PM
Post #5 of 10
(1466 views)
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Re: 1980 mercury monarch 1st gear only
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ok i bought the car in june and it was sitting for some years yes but this is the first time it has happened
***update***
i forgot to mention a very important fact that when its idling it knocks like a deisil tractor
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nickwarner
Veteran
/ Moderator
Oct 9, 2012, 4:40 PM
Post #6 of 10
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Re: 1980 mercury monarch 1st gear only
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when did it start doing that? Check the torque convertor nuts and make sure they aren't loose. Oil level good? I'm guessing this has an idiot light and not a gauge, may need to verify true pressure with a gauge.
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zerothenone
Novice
Oct 9, 2012, 4:59 PM
Post #7 of 10
(1446 views)
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Re: 1980 mercury monarch 1st gear only
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yes it does have idiot lights and all levels are good im taking it to a shop tomorrow im in way over my head
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 10, 2012, 5:38 AM
Post #8 of 10
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Re: 1980 mercury monarch 1st gear only
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I think this is a very late carry over of some older designs for trans shifting. A vacuum tube goes to a modulator (vacuum operated) at transmission and the diaphragm itself can fail or anything that causes it not to get vacuum of actual manifold vacuum will force it to default to lowest gear for the speed the car is going. First could hang on till it reached about 45 MPH same as if gas pedal was floored for full power.
You hear it so it's leaking down more than just messing with the trans shifting but idle is probably so low oil pressure isn't keeping up which would be noisy. It's harmful. Nick is right on - dump all vacuum hose you can find. It's cheap but should be done one at a time as there isn't any color coding or what goes where info that is that exact.
Other vacuum leaks are carb to manifold, brake booster, a can that probably looks like a large painted soup can on an inner fender, intake manifold to head(s) was not a problem in the V8 (302 C.I.D.) but could be if a 250 straight six which would probably be the only two engines available.
If this is a VV carb virtually all of them were tossed out for another type as I don't recall one of those working well new and on warranty. VV = "variable venturi" and would show two black (?) funky things where a choke plate would be up top of carb,
T
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zerothenone
Novice
Oct 10, 2012, 6:39 AM
Post #9 of 10
(1425 views)
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Re: 1980 mercury monarch 1st gear only
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well its fixed now it was the relay for the hoses an end seemed to have popped off so they just plugged the hosses together and it works again
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 10, 2012, 7:15 AM
Post #10 of 10
(1418 views)
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Re: 1980 mercury monarch 1st gear only
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Great - do toss all those hoses for automotive grade new when you can. May take some time but not that expensive on materials as said,
T
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