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Transmission not shifting after installing new manifold

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  • wiremanelect Dec 14, 2008

    no catalitic converter. i actually pulled the engine and replaced all gaskets. i think im missing a vacuum line somewhere but cannot figure out where to go from there. thanks

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O.k. the vacumm lines from the tranny would cause it not to shift over about 20 mph or so. but the lines run up under the hood. You will just need to look and track down all your vacumm lines from the tranny.

Posted on Dec 15, 2008

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Check your cataltic converter. IF you changed the manifold gasket you may have dropped some crosion out of the pipe into your converter if it is clogged it will not allow the transmission to shift. I just went throught this on my suburban.

Please let me know if you need further assistance.

Posted on Dec 13, 2008

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Dont throw it off a cliff just yet :-) Just check the vacuum line from the inlet manifold back to the transmission, ensure that fittings are air tight and that there are no holes in the line.
Explanation for possible fix:- When the car is at idle the inlet manifold plenum has a reasonably high vacuum generated within it. The vacuum line to the transmission conveys this drop in pressure to the shift solenoid. When you accelerate slowly you hardly open the throttle and the vacuum remains high in the system. The solenoid allows early shifts through to the higher gears. If you accelerat hard the throttle is open wide and hardly any vacuum is maintained. The shift solenoid, in the absence of vacuum in the line, now holds each gear for much longer allowing the engine to use its full power band.
If the inlet plenum suffers from an air leak or the vacuum line to the transmission becomes loose or a leak develops in it the solenoid reads this as if the car is accelerating hard and wants to hold each gear for as long as possible. This situation sounds like your problem so check that everything is free of any possible leak. If you find a leak and cure it not only will the shift pattern be fixed but your engine idle will be much better too.

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I'm afraid that the transmission's O/D solenoid malfunctioning or kick down cable may be misadjusted if so equipped.

looking at a rebuilt transmission if you plan to keep the Caravan.

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Servos/Accumulators The servos are hydraulic pistons and cylinders. They resemble the hydraulic actuators used on many other machines, such as bulldozers. Hydraulic fluid enters the cylinder, under pressure, and forces the piston to move to engage the band or clutches.
Servo operation tccs7015.gif

The accumulators are used to cushion the engagement of the servos. The transmission fluid must pass through the accumulator on the way to the servo. The accumulator housing contains a thin piston, which is sprung away from the discharge passage of the accumulator. When fluid passes through the accumulator on the way to the servo, it must move the piston against spring pressure, and this action smoothes out the action of the servo.
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Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.
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2 Answers

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