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The system called LH-2.1 seems to be a popular misconception/urban legend, but from what you say it is now being ID'd in parts lists?
I've got the Green Book factory manuals for 1982 and 1983. The LH injection system was introduced in 1982 in North American market and the Volvo books call it "LH Jetronic Fuel Injection System". Some people like to name it LH 1.0. In the 1983 books the upgraded system is named "LH Jetronic II". It integrated idle control into the ECU (the original LH system used a separate control module), and incorporated an anti-knock sensor into the ignition system. It was essentially unchanged through 1984 except for the late addition of the heated O2 sensor.
In 1985 the LH Jetronic 2.2 system arrived. I have seen no system in any Volvo books called LH 2.1. Maybe it's just a name people started giving the tiny upgrade to the original LH Jet II system in late production 1984, and now it has a life of its own.
You have the LH Jetronic II (aka LH-2, LH-2.0) in your 1984 car. Your ECU will have as its last three digits; 510 or (less likely) 503. Your AMM number will end in 002. The 1983 Green Book wiring diagram shows that the ECU connector has blank spaces where pins 19 and 24 would be.
Trivia nugget: LH is from the German "Luft-Hitzdracht" (hot-air wire) referring to the electrically heated wire in the AMM.
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Bob: son's XC70, dtr's '94-940, my 81GL, 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.
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