Question about 1999 Chevrolet Venture

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Hard shifting... book say check vacuum modulator, then says transmission modulator. cant find it in car. 99 chevt venture 6 cyl. 3.4l eng.

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For some reason I think it's electronic controlled and not vacuum modulated. I could be wrong. Good luck

Posted on Oct 02, 2010

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in the USA? 4.0L engine.
TRANSMISSION VAC>.
So that be automatic.
and some have a vacuum modulator.
some dont.
if it does, its just a vacuum line from the modulator to the plenum.
the modulator uses hard vacuum to sense engine load, to delay shifting/

some EPA hood stickers fail to show this hose.
because its a trans hose and not related to smog.
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then add TEE fitting to this line and to trans.
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there are 2 kinds of vacuum./
vsv solenoid switched, (like that on EGR)
direct plenum vacuum (bingo!)
and ported vacuum, weak or no vacuum at all at idle.

easy huh?, just use the hard vacuum line,, or make one.

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Does the code po128 have any thing to do with the auto trany shifting hard at times had the trany fluid and filter replaced today has not shifted hard today yet anyway .paved $2200. because check eng


code says its the coolent temp. The sensor may be bad or your car is overheating, transmission problem is probably the transmission control selonoid or module.

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1 Answer

Oil capacity on a 1991 geo storm


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Check fluid level in PARK and add fluid as needed.1991 GEO STORM 1.6L 4-cyl Engine Code 6 SOHC
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1 Answer

99 chevrolet venture code p0742 what is this shifts hard sometimes and then it dont do it for a while


this is a shift solenoid code. The part is located in the transmission. Your going to have to pay the piper in order to get to the root cause. There is no other option.

Jul 15, 2010 | 1999 Chevrolet Venture

1 Answer

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Check your shift module on the transmission. The vacuum line on mine had slipped off.

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1 Answer

My 2000 venture some time shifts hard. I had the filter & fluid changed but it still every now then does it. I was told that the shifting is electronic controlled. I am thinking it is a loose wire or...


It is true that it is electriconically controlled but probably not connection, sometimes the solinoid switches it the transmission can stick I would buy a can of "TransX" and put it in there it helps for sticking solinoids, slipping transmissions,and hard shifting. You can get it at wal-mart or your local part store It comes in a blue can and says TransX on it.

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1 Answer

Transmission will not shift out of first gear.


Check the vacuum line going to the shift module on the drivers side of the transmission. If theres a vacuum leak there, the transmission will either shift very hard or not at all.

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