Hey Phil,

Here's another response meant to unconfuse, if that's possible.

First, the LH thing. LH1.0 was a California solution for 1982 on a B21F. It was called simply "LH-Jetronic" as the tech writers did not have foreknowledge of the succeeding versions Bosch would make in this era of emissions and fuel efficiency mandates.

In '83, with the B23F we got LH2.0, though it was called LH-Jetronic II then, not knowing it would develop with sub-versions. This was what we have in the B-23F for 1983 and 1984. There was no "LH2.1" in a 240; that was a turbo 7-series which got LH2.1 despite what someone at IPD thinks.

240s were built with LH2.2 fuel between 85 and 88 inclusively, then in 89 LH2.4 through 93. The LH3.1 appeared for manual transmission cars, and I am not sure, but believe these only got built for 90, 91, and 92 MY. No LH3.1 in a 93 or an 89.

"I believe he added or changed out a resistor or a diode in or onto a circuit connected in someway with the ECU."

You saw this in a response (click here) made on an unrelated issue to Gwen for the purpose of giving the LH2.0 electrical diagram. This mod, it turns out, was also done in a TSB by Volvo, by wiring a jumper between the starter and the ECT signal. It is not for running lean or warming up, only for starting. Sort of a cold-start improvement.

I tried my hand at helping Boxcar Man, finding same results as Eric, where the lower hose seems to be plentiful 1326110 in Google results but the upper hose 1336080 gets NLA mentioned in search results. If anyone can find one for OP it will be Eric. I also ran into the same sort of fun looking it up, noting an omission on the engine model application in the parts page title, but then inside the listing (group 28 page 625 on my fiche) illustration callout items 19 and 20 have both B21F and B23F parts litsed.

All in all, my sunburned red 84 B23F was my favorite car, and yes, you did see a photo of it on the rollback headed for Valhalla at 375K. Rust. I'd rather remember it like this.




--
Art Benstein near Baltimore

During January 2018, the average contiguous U.S. temperature was 32.2°F, 2.1°F above the 20th century average