dakotabound wrote:
Continuing my humor on this vehicle. Yesterday, I had to go to the southern part of town, so decided to take !-25. Wouldn't you know it...this little beast decides to run up to 65mph on my unadjusted speedo (read 70mph) for the entire time with the temperature gauge staying in one place, just south of mid range. No wind, little traffic...go figure.
That's sounding like mine. Note the first word of that topic: "Erratic". It was in intermittent problem.
dakotabound wrote:
So, that little vacuum line that attaches to the white plastic part on the rear of the injection pump with the line crossing over the front of the engine to the driver's side inner fender well where it fits onto a part which has a wire (sensor/switch?) going into the loom...this unit does what and if disconnected what happens or does not happen that should happen? I ask because I double checked it when looking for that CSD Joe Isuzu mentioned in a previous posting.
That white plastic part is the fast idle diaphragm. At this age, it probably does nothing at all. By now, the diaphragm probably leaks. You can disconnect that vacuum line and hook up a vacuum pump to directly to it. If it pulls the throttle arm open, it's working. All it does is brings the idle up when cold, or when the a/c compressor is running (if equipped with a/c).
dakotabound wrote:
Also, in reading the posts previously suggested I noticed this Zexel company brand that offers injection pump rebuild kits. Anyone know what rebuild kit part number for my '81 pump might be, or do I have to locate the data on my pump first, then go for the rebuild kit? Also, is there a simple source to get this kit?
My guru mechanic and I just might want one if we think we're smart enough to tackle rebuilding the CSD, even the pump...challenges are what attract us to such problems; either that, or we are the people the real mechanics dream about for work!
It's a standard Bosch design, so most of the seals are still available. Some people have re-sealed their pumps "at home" but it's not a rebuild. To do a true rebuild, you need some specialized tools.
The Isuzu CSD is NOT a standard component. I don't know of anybody but Isuzu who used this type of Cold Start Device. Consequently, parts are not available and it's probably better to remove it than attempt a rebuild. It can be replaced with a manual CSD (from an old VW Bosch pump), but that requires an almost complete teardown to install. I had this done on mine when I had it overhauled. It now has a VW lever-operated Cold Start Device--and I've never hooked up a cable to it, because I've never needed it. It starts just fine without it.
Any more, and I'll be just repeating what you've already read on the link that I gave you, so I'll stop here. And given that this topic probably has VERY little interest here (as Luvrv8 mentioned), and it's been pretty much a 1-on-1 dialog, maybe you should post follow-up questions at IsuzuPup.com. You'll get more feedback than just from me, because we have a lot more diesel drivers there.
Jack
_________________
'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com