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Mercury 90 outboard transmission slipping/clunking at 3000 rpm,rpm increases with out touching throttle

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Check your prop hub. The rubber isolator is probably bad.

Posted on Jul 06, 2009

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Posted on Jan 02, 2017

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1 Answer

Why does my 1999 Chevy Blazer shift really hard into second gear without the RPM's increasing like the tranny's slipping?


Shifting hard broken modulator valve on the trany itself normally there a vacuum line connected to it

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Full throttle


check when its on full throttle that the carb butterfly is at 90deg and not over as this will reduce throttle but max advance on ignition !

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I have 1995 2.0L V4 Mercury Mystique that seems to make a pop noise every time I press the gas past 2000 rpm to 3000 rpm. Once it reaches 3000 rpm, it just revs up without catching any gears. It seems to...


you must reset the ignition timing to manufacter specification. Otherwise you must RUN the scanner/computer for easy diagnostic and fix it. You can faulty: ignition coil+sensor+PCM+BCM+wires spark+sparkplugs,etc see the diagram attached.
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2004 Ford Explorer transmission shift problems, O/D light flashes, engine RPM high.


Stop using it

If have been, you may have ruined it,
just driving ten miles

Have a trans shop diagnose the issues

The clunk into reverse troubles me alot

I used to own a trans shop

Mar 12, 2013 | Mercury Grand Marquis Cars & Trucks

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Free Mercury Outboard ONLY, 2-40HP 1965-1989 Repair Manual 1-2 Cylinder, 2 Stroke


I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.

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2002 Mercury Cougar Squeal


Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?

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2000 GMC Jimmy SLT 4wd, 65k miles, baby'd, driven


bad transmission, it will need rebuilding or replacement. sorry....hopefully this helps

Aug 16, 2009 | GMC Jimmy Cars & Trucks

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Hard shift from 1st to 2nd. Engine rpm goes to 3000.


the tranny is slipping ,,in other words its starting to go.

Jun 27, 2009 | 1996 Ford Mustang

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