It sounds like the weak vacuum could be the problem but it still could be the
CAD. I don’t know how much vacuum the lines should have and I don’t recall
those lines having a tremendous amount of vacuum to begin with. I’ll try to see
if I can find in my FSM how much the vacuum should be. What I would do next is
to pull the connector on the transfer case switch. There are 4 vacuum lines
connected into the T-Case switch. 1 comes from the engine, 1 connects to a
ball canister under the bed and 2 that go to the front CAD assembly. Since you
stated that the vacuum switches from one CAD line to the other, it sounds like
the T-case switch is OK. And since both sides seem to be low, a leak, if any,
would probably be before where those lines split off at the switch. Are you
getting the same amount of vacuum from the line coming from the engine? Try
crimping off the line to the ball canister and see if the vacuum amount
increases on the CAD connector. If we can verify how much vacuum should be
there, and what you have is within spec., we can isolate the problem to either
a stuck CAD or a vacuum leak. Since the engine was swapped, are you sure the
line was put back in the correct place? You could have low vacuum because it
was connected incorrectly. I’ll see if I can find any additional info in the
FSM to help troubleshoot the problem and post what I find either Thursday or
Friday. I’ll be off-list for a couple of days. I’m driving to VA tonight to
attend my Step-Grandfather’s funeral in Arlington National on Wednesday. I’ll
have limited e-mail access while I’m traveling.
Walt
In article <41966168.9010207@aol.com>, SilverEightynine@aol.com (Terrible Tom)
writes:
>
>
> Mike Fox wrote:
> > Well I got the old girl running and I have been driving it around for a few
> > days.
> > After I changed the fuel pressure regulator It blew the fuel return line
> > which I had to patch twice. Then it blew a brake line which I replaced. I
> > got over all that and it ran but still not great. The problem turned out to
> > be a plugged converter from all the oil that the old motor was burning
> > before the swap. Runs great now.
> > Just a couple more things left to do.
> > First, it has to pass a emissions test for me to get a tag. The only
problem
> > here is that I didn't install the air pump cause it's seized. If it wont
> > pass I'll have to get a J-yard one I guess. I'm going to try it on Monday
(I
> > got 10 day pass good until Thursday).
> > Second, it won't engage the front axle for 4wd. The front driveshaft is
> > turning so it's not the transfer case. I read Walt's web-site and did the
> > checks on the auto engage unit. The vacuum coming from the transfer case
> > seems real weak, It does switch sides though. I tried spraying the actuator
> > out but no change. Today I'm going to see if I can get an actuator. I was
> > also thinking about taking the switch out of the transfer case to se if it
> > needs freeing up. Maybe this is a bad idea cause everything is very rusty?
> > Also the headliner for my truck is shot. Does anyone know if this is
> > available anywhere? Is the 88 the same as later models?
> > You guys have been a big help so far.
> > thanks again
> > Mike
> >
> >
>
> Hey Mike! Sounds like you are making good progress. You will need the
> air pump inorder to pass visual inspections checks - you "might" be able
> to get away with it if you only have he exhaust sniffer tests. However
> it may affect the emissions output.
>
> I have had problems with my CAD (Central Axle Disconnect) The vacuum
> lines start out from a vacuum tee at the top back of the engine - behind
> the throttle body - they go down to the transfer case. At some point
> they go from rubber to metal hard lines. They go to the transfer case -
> which when the lever is pulled to go into 4wd - the vacuum is switched
> and is sent to the front axle from the T-case. If you have weak vacuum
> - its safe to assume that somewhere along those lines you have leaks. I
> just reread your post - you mentioned the transfercase - so I assume you
> already knew what I just told you LOL
>
> You can change the CAD unit on the axle - but because you said the
> vacuum was weak - I would doubt the CAD is bad. The diaphram can go out
> - but you can check that operation with a hand operated vacuum pump.
>
> Headliners in both my 89's are bad... if the headliner board is still
> solid and not damaged... you can get some new fabric, or reuse your old
> fabric if its good - and pick up a can of headliner/fabric adhesive. I
> know we sell it at AutoZone - most parts stores will sell it - a fabric
> or arts and crafts store would also have that kind of spray adhesive.
>
> Where are the pics?! I wanna see this truck!
>
> --
> -----------------------------------------------------------------
> Attention Infidels: I am your official DBDoMPfIWUMOT!
> Terrible Tom -- AIM & Yahoo Name: SilverEightynine
> http://members.aol.com/silvereightynine/
>
This archive was generated by hypermail 2b29 : Sat Jan 01 2005 - 11:47:52 EST