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Q: Can a vacuum error cause 1989 f 150 302 to shift improperly?
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What is the cause of fast shift in a 1971 El Camino t400?

replace the vacuum shift diaphragm lacated on the side of tranny make sure vacuum hose has no leaks or cracks in it or just replace it w/ good non collapsable vacuum hose

What would cause an 03 Chevy tahoo to die out when you apply the break to shift out of park?

vacuum leak?

Can a vacuum leak from the brake booster cause the transmission to shift at higher rpm's?

yes,being that in most cars the vacuum runs most controls on & around the engine

How zero error affect accuracy?

It will create a consistent shift in all your results; it is a systematic error. Eg, might cause all your results to increase by 5.

My1996 blazer will not down shift?

Possibly a vacuum problem or transmission solenoid. This will have to be properly diagnosed in order to definitively determine the cause.

When I put my 1999 subaru impreza into drive it hesitates but will shift into reverse with no problem the fluid level is good could the filter need changing?

A plugged transmission filter can cause your transmission to hesitate when you shift into drive. A collapsed vacuum hose can also cause the problem.

What would cause an 87 ford E150 not to idle and also shift from first to second at an unusually high rate of speed?

Sounds like it may be a vacuum leak Check fittings and vacuum hoses under hood, under dash and at vacuum modulator on transmission

What is a vacuum modulator?

On some of the older vehicles the vacuum modulator controlled the shift points of the transmission by using the vacuum supplied from the engine.

What is a Transfer case vacuum switch?

Some systems require the engine be at low power to shift, the easy way to ensure this is to use a vacuum switch Also some cases use vacuum to actually shift into 4WD

What would cause transmission fluid to be found in the vacuum line connected to the heater control?

on some cars there is a automatic transmission modulator valve that tell by vacuum when to shift gears. If that valve goes bad you will get tranny fluid in your lines.

What would cause a newly rebuilt 700-R4 transmission under 300 miles on it to shift very hard and not shift into overdrive?

Improperly adjusted TV cable, which will also lead to early Transmission Failure. These adjustments are critical and can distroy a 700r4 and 200r4 in less than 200 miles.

What does a vacuum do?

a vacum works with the tranny to Shift an automatic vehicle