Monte7071 Posted May 18, 2009 Share Posted May 18, 2009 I was messing with the Monte the other night and noticed that the vacuum port on the rear of the intake has two lines. One goes to the a/c canister and the other to the vacuum modulator. The one going to the a/c is torn would this cause my hard shifting. I will repair it either way but just wanted some input. Quote Link to comment Share on other sites More sharing options...
monte70car Posted May 18, 2009 Share Posted May 18, 2009 I would not think so, since the hose that is torn is going to the a/c canister. To test I would cap the fitting going to the a/c canister to see. Have you pulled the pan and change the filter and fluid? Quote Link to comment Share on other sites More sharing options...
Monte7071 Posted May 18, 2009 Author Share Posted May 18, 2009 Have not pulled the pan. I also need to ck the fluid level it is leaking from the speedometer cable housing. Quote Link to comment Share on other sites More sharing options...
footballubet Posted May 18, 2009 Share Posted May 18, 2009 The vacuum leak on the canister line can cause the hard shifting. No vacuum to the modulator = hard shift. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted May 18, 2009 Share Posted May 18, 2009 Quote Link to comment Share on other sites More sharing options...
Monte7071 Posted May 18, 2009 Author Share Posted May 18, 2009 I thought that was my problem when I seen it but sometimes the voices in my head lie to me ha ha. Thanks guys. Quote Link to comment Share on other sites More sharing options...
kc8oye Posted May 18, 2009 Share Posted May 18, 2009 yeah i'll third that the torn AC line will cause a loss of vacuum there which will affect the vac. mod. also check the piece of rubber hose at the canister it self.. one other good check is to take a hand held vac. pump and put about 12-15 inches of vacuum on the canister and make sure it will hold vacuum.. (checks for a torn diaphram) don't go higher then about 20inches tho because you can rupture the diaphragm with too much vac., Quote Link to comment Share on other sites More sharing options...
wallaby Posted May 20, 2009 Share Posted May 20, 2009 Yep...the bad hose will cause the trans modulator to get a poor vacuum signal. When the trans modulator gets poor vacuum, it delays the upshifts and makes them firmer. Quote Link to comment Share on other sites More sharing options...
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