Quote:
Originally Posted by pawoSD
Ok I read this thread....and I saw that Brian mentioned adjusting the vacuum valve on the injection pump to have higher idle vacuum...how does one do this?
Also, yesterday I put the mityvac on the line leading into that valve (the trans valve on the IP) and it leaks down really fast in the idle position, I pumped the mityvac as fast as I could and could only reach 12-13"...and as soon as I stopped it quickly leaked back down....does this mean the valve is faulty/leaky? It does "leak down faster" as you apply throttle...and it does it a linear fashion as you increase the throttle position....its just that at idle it leaks down too easily...is this normal? I read you should see 20" on that line at idle....
I checked my modulator for vacuum and it will hold 25" rock steady...no leaks. Could it still need replacement or is it ok?
I have the annoying downshift clunk when slowing down and my 3-4 shift slips/is soft unless I let off the throttle when it wants to shift...then it bumps right in...its also quick and firm when the trans is real warmed up.
Does my valve on the trans need rebuilding/re-sealing? I'll check the ones on our other cars today and see if they leak like mine. (both shift great and do not clunk when slowing down)
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The first thing is to be sure you've connected the Mityvac properly. Above the VCV is a T............one end is supply vacuum............the opposite end goes to the modulator............the bull goes to the VCV.
You must remove the supply vacuum line and install the Mityvac in its place. Then, pump up the Mityvac and see what it reads. If it won't pump up and hold any vacuum...........and the modulator holds vacuum.............the VCV is NG. It should hold 10"-12" at idle.