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Wat vacuumed hoses couses transmission to shift

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Modern automatic transmission do not use any vacuum hose to shift, they are electronically controlled by a computer.

Posted on Nov 08, 2012

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Posted on Jan 02, 2017

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SOURCE: transmission won'y shift into higher gears

It could be a bad vacuum hose or a bad solenoid. Check fluid condition and level first. A Chilton or Haynes repair guide will tell you what you need to know about placement of hoses and solenoid.

Posted on Jan 25, 2009

  • 2 Answers

SOURCE: my transmission will not shift out of first gear

your shift cylinoids mite be out or the clutches may be burnt time to replace the tranny it sounds like could be the valve body or real low on fluid check the fluid and smell it if the fluid smells burnt chances are its cheaper to just replace the tranny

Posted on Feb 02, 2009

  • 507 Answers

SOURCE: transmission not shifting when pressing on the gas

modulator on trans if its at bottom on trans(round object on back or side of trans case,or if on engine it connects to vacuum inlet port ir small pipe on inlet manifold ...even near carb,,,efi,really screws up shifting like youve said

Posted on Nov 05, 2009

  • 50 Answers

SOURCE: where does the shift solnoid on a 1985 bronco

on the rear of the transmission there is a metal stem sticking out of the rear

Posted on Feb 12, 2010

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What is the cost to replace the transmission vacuum hose on my 1999 Merc Sable? Can my boyfriend who replaced my brakes be able to figure it out? How accessable is it without a lift?


This is an electronically controlled transmission. No vacuum hose. It doesn't have a modulator valve. The shifting is done by shift solenoids.

Aug 15, 2017 | Cars & Trucks

1 Answer

My 92 cadillac deville shift at 30mph and 6th do. You think it's the transmission .speed sensor


Check the vacuum line or hoses that run from the transmission to the engine. It may have come loose or you have a vacuum leak. If your vacuum is fine, you should change the modulator on the side of the transmission. That's what determines when your transmission shifts. Note..sometimes the diaphragm inside the modulator will burst and allow fluid to enter the vacuum line, so look forfluid in the line also.

Feb 22, 2015 | Cadillac Cars & Trucks

1 Answer

97 bmw 528i trany will oonly shift manuly what couses this?


I would say Vacuum modulator or their Vacuum lines but I think this is an electronic trani.

Dec 19, 2012 | Cars & Trucks

1 Answer

1974 caddy eldorado will only shift into 2nd around 35mph or if I let off the gas at about 20mph. will not shift into 3rd until about 60mph


you have a dirty filter in your transmission, you can be a pint or two low on fluid. Onthat older model car, that transmission shifting was controlled by a vacuum sensor (not real name) a small cylinderical device sticking out the tansmission, about the size of a "dixie"bathroom drinking glass. Check the hose on that from transmission to where it plugs in at the vacuum multi port on the rear of the intake manifold. replace the entire hose.

Sep 10, 2011 | 1974 Cadillac Eldorado

1 Answer

Transmission shift Engine has to be 2000 RPM for the Transmission to shift up you can let up it will change gears. Shifts fine hesitates very slight from direct to OD. Is 2000 RPM Normal


Check for vacuum leaks--especially along vacuum hose that goes to transmission or other hoses that connect near the port that the transmission vacuum line connects at the engine intake manifold. Please reply if you have more questions.

Sep 15, 2010 | 2004 Ford F150

2 Answers

Transmission does not shift out of 1st gear automatically. must get off gas for rpms to drop and then it will shift to 2nd gear. no other shifting issues.


There is a vacuum line that is connected to a vacuum modulator on the transmission. The vacuum modulator looks like a tiny inline fuel filter on the right rear of the transmission. Remove the vacuum line from the modulator, if transmission fluid spills out when the rubber hose is removed the modulator is punctured. The engine will **** your transmission fluid through the vacuum line and into the intake system and burn it through combustion. If the modulator is punctured you must have it replaced.

Nov 29, 2009 | 1992 Ford Explorer

1 Answer

Transmission not shifting when pressing on the gas pedal stop a deadstop.vacuum hose from transmission is still attatched to trans but is disconnected from other end.where does the vacuum hose connect to?


modulator on trans if its at bottom on trans(round object on back or side of trans case,or if on engine it connects to vacuum inlet port ir small pipe on inlet manifold ...even near carb,,,efi,really screws up shifting like youve said

Nov 05, 2009 | 1998 Ford Contour

2 Answers

Truck doesnt wanna shift transmission is not slipping just dont wanna shift and it shakes when shifting to over drive


The vacuum modulator on side of transmission::
vacuum hose is disconnected or the diaphragm in the mod is ruptured, causing overdrive to shift to soon.
Replace ($20 AutoZone) ... no special tools.

Sep 28, 2009 | 1992 Chevrolet C/K 2500

1 Answer

Transmission does not shift at the proper RPM. The engine over revs before it shifts. Does Vacuum or electric shift these transmissions? If it is electric, does it have a relay?


At your Bronco's age, the vacuum hoses are suspect. The plastic ones break, the rubber ones crack and leak. There is a specific one to the transmission to control shifting, usually. Some vehicles have a modulator valve on the transmission; when it fails you will see white smoke at the tailpipe and you will lose trans fluid. Check all the vacuum lines, large and small. A vacuum gauge is a great tool, it will tell you a lot about an engine.

Apr 25, 2009 | 1992 Ford Bronco

1 Answer

Transmission won'y shift into higher gears


It could be a bad vacuum hose or a bad solenoid. Check fluid condition and level first. A Chilton or Haynes repair guide will tell you what you need to know about placement of hoses and solenoid.

Jan 25, 2009 | 1987 Ford Crown Victoria

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