m1009 vacuum lines

[hemi348]

Hey guys, I am a new to the whole MV scene.

I have a m1009 that shifts too late and too hard. I have read on this site that old and spongy vacuum lines are typically to blame for this problem. However since I am new to this vehicle, I dont know where the vacuum lines are even located. I have found the transmission cooler lines but cant seem to find the vacuum lines.

Where can I find them running from the tranny?
Where can I find them running from the engine compartment?

If anyone can point me in the right direction that would be fantastic, thanks guys.

 

[hemi348]

Ok, Im pretty sure that I found them off the regulator via the attachment below. But I still cant find it on the transmission?

 

[dunedigger]

there is a steel line on the passenger side on the side of the tranny. You will find a short piece of rubber line connecting it to the tranny. It typically goes bad there. I changed all of my hoses and still had the same late shift problem. Mine was corrected by adjusting the modulator on the side of the injector pump.

 

[rottiedog]

Mine was a leaky line to the pump. Problem is backa gain but haven't gotten around to it yet. Need to replace all lines!!

 

[hemi348]

there is a steel line on the passenger side on the side of the tranny. You will find a short piece of rubber line connecting it to the tranny. It typically goes bad there. I changed all of my hoses and still had the same late shift problem. Mine was corrected by adjusting the modulator on the side of the injector pump.

Is it a modulator or a regulator on the injector pump? Because I have heard it called both.

 

[dunedigger]

Is it a modulator or a regulator on the injector pump? Because I have heard it called both.

Me too, not really sure now that you question it.

 

[lavarok]

The modulator is on the side of the transmission. The regulator is on the IP.

Page 46 of 9-2320-289-34P references the part as:

14057219 VALVE,VACUUM REGULA

Stock modulators do not allow adjustment. Most replacements will.
You can adjust the shift points at the modulator if it supports adjustment or the vacuum valve regulator.

 

[M813rc]

Take your air cleaner off and look on top of the engine, right side, there is one up there running from the front to the back and one short one. They are obvious when you look there. I had a similar problem to yours, replaced those top lines and all shift problems went away. Took 15 minutes and less than $6 in parts (I spent $6.23 and had a bunch of extra hose left over).

Cheers

Edit- looked closer at the second post diagram, those are the ones I was talking about, you may have found them already.

 

[paraclete comes]

im having the same issue with late shifts. I plan on looking for the easy fix first, so later today I think ill pull the air cleaner and try to hunt down those lines, pull them off and take them into auto zone for correct size matching. Hope this works

 

[lindyp38]

maybe thats my problem......ill recheck my lines..........thanks

 

[tgtaylor64]

I have the opposite problem, the M1009 shifts way to fast. I have replaced everything except the regulator valve on the IP due to cost, although, the vacuum pump was $125. Moving the valve in each direction makes no difference in shift points. Completely disconnecting the vacuum results in late shifts so more than likely the regulator valve is the issue.