scjconv wrote:
Just curious, is anyone getting +30 mpg with one of these diesels? I read where this is possible so a few years ago and I bought one from a guy in Portland, OR, drove it back to So CA and it got around 20 on the return trip. Later I drove it to Las Vegas and got about the same, but going up hills on I 15 I was repeatedly down to 25-30 mph! I just wondered if someone drove one on flat ground, which is not to be found in CA, would they get good mileage.
I almost got ran over so many time on CA freeways that I did sell the engine and installed a sbc, with aod so I could use the truck. Mine gets over 20 now, and if I can install a FI unit I expect to get close to 30.
There are just too many hills here to drive one safely,
Please courteous responses please, I write this with respect to your opinions and expect the same.
thanks,
I regularly get about 38 mpg in town, driving carefully. If yours was 2wd, manual transmission, you should never get much under 30 mpg. If you do, something is wrong with it.
Now, the rest of my reply is back on-topic, as a courtesy to the original poster (The Dudster)...
There was an improvement added in '84 (too late for the LUVs) that recirculates blowby gases into the intake. The '81-'83 versions have an oil separator, but some oil gets by and comes out the draft tube onto the road. In '84, they added another oil separator on top of the motor. Quite a few owners have made their own systems to capture the oil, and route the gases back to the intake. The key thing is, you MUST not send oil to the intake, or you could cause a runaway engine.
And second, you need to do it without causing back pressure, or it will push oil back out the dipstick tube.
Here's a good starting place for you. There are other good topics on this subject, too.
Jackw
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com