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mbouse · Post by **mbouse** » Wed Jan 03, 2007 3:13 pm

Manifold vacuum is where you hooked your brake booster to (directly on the manifold).

Ported vacuum is where you hooked your dizzy to (at the carb). the pull will be much less here.

tonysfiat · Post by **tonysfiat** » Wed Jan 03, 2007 3:20 pm

Mike

thanks

that is where i connected the tranny vacuum modulator tube

So Cal Mark · Post by **So Cal Mark** » Wed Jan 03, 2007 3:39 pm

manifold vacuum is below the throttle plate, thus drawn from the manifold. Ported vacuum is above the throttle plate, thus is not present at idle or when the throttle is closed

mbouse · Post by **mbouse** » Wed Jan 03, 2007 6:31 pm

much better defined than my answer. thanks mark.

manoa matt · Post by **manoa matt** » Thu Jan 04, 2007 9:19 pm

hey guys

Does anyone know if the Fiat Automatic Transmission uses electrical shift solenoids? Or are solenoids only for more recent cars? I'm not familiar with the design of older model autotransmissions. However I got a 98 Jeep Cherokee, I started to loose shifiting between 1 and 2 I experienced some slipping and jerking. I changed the shift solenoids and problem solved.

matt

So Cal Mark · Post by **So Cal Mark** » Thu Jan 04, 2007 10:53 pm

the Fiat auto is a GM TH180 and does not use electrical solenoids to control shifting (a blessing IMHO)

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