How Can I Tell Which Version Of Bosch LH Fuel Injection Is On My Volvo 240?
There are 4 Variations of Bosch LH-Jetronic on Volvo 240 models.
The easiest way to tell is to look at the MAF sensor.
1982 B21F Bosch LH-Jetronic 1.0 / 2.0
There seems to be a lot of dissagreement on what the version number is on this early system. Some people say it is version 1.0 others say it is 2.0 and yet others say 1983-1984 is version 2.0. If you consider that this is the first generation of LH on a Volvo, the sure, it's version "1". Regardless, cars with this fuel system were quite rare in the USA.
The Bentley Bosch Fuel Injection & Engine Management states that the first LH system on a Volvo was LH 1 and then LH 2 appeared in 1984 which doesn't really work since there were definite differences between the first 1982 version and the 1983 version. In this case, they may be referring to the digit after the decimal i.e. 2.1 & 2.2 but that still doesn't account for the 1982 version that was significantly different.
No matter the version nomenclature, this was the first one that appears on a production Volvo.
- MAF sensor Bosch numbers: 0280212001
- Aluminum MAF Housing w/ 6 pin plug with trim adjustment.
- Originally had a giant flame trap/arrester in outlet end of the MAF instead of a screen like later versions. The idea is that if there is a back-fire that the flame arrestor will prevent the flame from damaging the hot wire MAF.
- Hot wire style MAF
- This system also uses rubber hoses between the fuel rail and the injectors.
There aren't many parts available for this early limited production system.
1983-1984 Bosch LH-Jetronic 2.1
Second generation of LH on a Volvo
- MAF sensor Bosch numbers: 0280212002
- Hot wire style MAF
- Aluminum MAF Housing w/ 6 pin plug with trim adjustment.
1985-1989 Bosch LH-Jetronic 2.2
Third generation of LH-Jetronic on a Volvo
- MAF sensor Bosch numbers: 0280212007, 0986280102
- Hot wire style MAF
- Black Plastic MAF Housing w/ 6 pin plug w/o trim adjustment
1989-1993 Bosch LH-Jetronic 2.4
Fourth generation of LH-Jetronic on a Volvo
- MAF sensor Bosch numbers: 0280212016, 0986280101
- Hot wire style MAF
- Black Plastic MAF housing w/ 6 pin plug w/o trim adjsutment
1990-1993 Bosch LH-Jetronic 3.1
Fifth generation of LH-Jetronic on a Volvo
- MAF Sensor Bosch numbers: 0280217001
- Hot filament style MAF
- Black Plastic MAF Housing w/ 4 pin plug
- MAF sensor can be removed from housing