Die Bosch D-Jetronic war 1967 die erste Großserien elektronische Einspritzung der Welt. - Bosch's D-Jetronic was the first mass-production electronic fuel injection.
Volvo 1800ES D-Jetronic MY73
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7 Monate 3 Wochen her #20847
von Dr-DJet
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshop K-Jetronic 31.8. (F), Jubiläumstreffen 18.10. bei Bosch (N)
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Dr-DJet antwortete auf Volvo 1800ES D-Jetronic MY73
Hi Pierre,
congrats for having found the fault !
4.05% CO seems too high. I would drive a bit and then adjust to workshop manual values. At a quick glance I saw 1-2% as normal value.
congrats for having found the fault !
4.05% CO seems too high. I would drive a bit and then adjust to workshop manual values. At a quick glance I saw 1-2% as normal value.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshop K-Jetronic 31.8. (F), Jubiläumstreffen 18.10. bei Bosch (N)
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
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7 Monate 2 Wochen her #20859
von jpierre
jpierre antwortete auf Volvo 1800ES D-Jetronic MY73
I received all the parts to build a fuel pressure manometer, as Dr-Djet suggested.
I just have chosen the "cheap" version of reader, without glycerin inside.
So I tested it on the 1800ES. It works fine and is very accurate, either because of construction and thanks to the big diameter of the reader. A great tool, which can be used for any other injection system with small adaptation.
One point on the 1800ES : the fuel pressure is not constant as the engine temperature rises. If I adjust the fuel pressure to 2.1 bar when engine is hot, I am not far from 2.5 bar at engine start around 0°C. What can be the cause of this ?
I just have chosen the "cheap" version of reader, without glycerin inside.
So I tested it on the 1800ES. It works fine and is very accurate, either because of construction and thanks to the big diameter of the reader. A great tool, which can be used for any other injection system with small adaptation.
One point on the 1800ES : the fuel pressure is not constant as the engine temperature rises. If I adjust the fuel pressure to 2.1 bar when engine is hot, I am not far from 2.5 bar at engine start around 0°C. What can be the cause of this ?
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7 Monate 2 Wochen her #20860
von Dr-DJet
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshop K-Jetronic 31.8. (F), Jubiläumstreffen 18.10. bei Bosch (N)
Dieses Bild ist für Gäste verborgen.
Dr-DJet antwortete auf Volvo 1800ES D-Jetronic MY73
Hi Pierre,
normaly that means an issue with pressure regulator. In rare cases it could be too little fuel volume from pump or blockage on return line to tank.
normaly that means an issue with pressure regulator. In rare cases it could be too little fuel volume from pump or blockage on return line to tank.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107
Workshop K-Jetronic 31.8. (F), Jubiläumstreffen 18.10. bei Bosch (N)
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
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7 Monate 2 Wochen her #20864
von jpierre
jpierre antwortete auf Volvo 1800ES D-Jetronic MY73
I will measure with another fuel pressure regulator.
If the problem remains, it will be an interesting point.
If the problem remains, it will be an interesting point.
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7 Monate 5 Tage her - 7 Monate 5 Tage her #20880
von jpierre
jpierre antwortete auf Volvo 1800ES D-Jetronic MY73
Some information about work done on this car :
- engine oil drain revealed dark oil, sign of excessive enrichment, probably linked with bad electrical connections...
- fuel pressure is well stabilised when engine is hot, but remains higher when engine is cold (2.3 bar). As a consequence, warm-up phase is a bit erratic. Unfortunately, as fuel pressure regulator is not available in new condition, it is a bit tricky to find a reliable one.
- throttle sensor has been carefully opened :
Dieses Bild ist für Gäste verborgen.
Dieses Bild ist für Gäste verborgen.
PCB was dusty (means some risks of erosion), so I carefully cleaned it with a small and soft pencil, some brake cleaner fluid, dried it with low pressure compressed air, then cleaned it again with a electrical contact cleaner and a thin piece of soft paper inside the contacts.
Then I adjusted and checked the right positioning of the sensor to obtain the resistance change when leaving idle position and the 10 resistance changes when accelerating and nothing at decelerating. Everything is ok.
Finally, I replaced the thin foam barrier around the sensor, hoping to improve the sealing of the housing.
This throttle sensor is the first version, right ? Is it the right one for '73 Volvo 1800ES ? Not sure...
- engine oil drain revealed dark oil, sign of excessive enrichment, probably linked with bad electrical connections...
- fuel pressure is well stabilised when engine is hot, but remains higher when engine is cold (2.3 bar). As a consequence, warm-up phase is a bit erratic. Unfortunately, as fuel pressure regulator is not available in new condition, it is a bit tricky to find a reliable one.
- throttle sensor has been carefully opened :
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
Dieses Bild ist für Gäste verborgen.
Bitte anmelden oder registrieren um das Bild zu sehen.
PCB was dusty (means some risks of erosion), so I carefully cleaned it with a small and soft pencil, some brake cleaner fluid, dried it with low pressure compressed air, then cleaned it again with a electrical contact cleaner and a thin piece of soft paper inside the contacts.
Then I adjusted and checked the right positioning of the sensor to obtain the resistance change when leaving idle position and the 10 resistance changes when accelerating and nothing at decelerating. Everything is ok.
Finally, I replaced the thin foam barrier around the sensor, hoping to improve the sealing of the housing.
This throttle sensor is the first version, right ? Is it the right one for '73 Volvo 1800ES ? Not sure...
Letzte Änderung: 7 Monate 5 Tage her von Dr-DJet.
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7 Monate 5 Tage her - 7 Monate 5 Tage her #20881
von jpierre
jpierre antwortete auf Volvo 1800ES D-Jetronic MY73
...
Letzte Änderung: 7 Monate 5 Tage her von jpierre.
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