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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.
914 1.7 d jet , early type without idle mixture adjuster on ecu.
- pasj50
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2 months 2 weeks ago #21654
by pasj50
914 1.7 d jet , early type without idle mixture adjuster on ecu. was created by pasj50
Hello there D jet enhousiasts,
I have a early 914 107 in original condition.
At idling the mixture is to lean... aprox 0.12%
checked for air leaks, none found , although rubber parts have become hard...
drives good, Warm starts after a 5 minute stop are terrible...
how can i adjust the mixture on idling,
measurements on a four gas tester gives , no Co , only 150Hc , and about 12% CO2 with 2.3% O2 leftover...
best regards
I have a early 914 107 in original condition.
At idling the mixture is to lean... aprox 0.12%
checked for air leaks, none found , although rubber parts have become hard...
drives good, Warm starts after a 5 minute stop are terrible...
how can i adjust the mixture on idling,
measurements on a four gas tester gives , no Co , only 150Hc , and about 12% CO2 with 2.3% O2 leftover...
best regards
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- Dr-DJet
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2 months 2 weeks ago #21655
by 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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Replied by Dr-DJet on topic 914 1.7 d jet , early type without idle mixture adjuster on ecu.
Hi Unknown,
I would check injectors first and then switch to ECU / MPS combination that supports idle-run rheostat and thermo time switch.
I would check injectors first and then switch to ECU / MPS combination that supports idle-run rheostat and thermo time switch.
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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2 months 2 weeks ago #21656
by nordfisch
Replied by nordfisch on topic 914 1.7 d jet , early type without idle mixture adjuster on ecu.
Hi unknown,
did you check the fuel pressure?
Are all parts the original ones, especially the injectors?
Regards
Norbert
did you check the fuel pressure?
Are all parts the original ones, especially the injectors?
Regards
Norbert
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2 months 2 weeks ago #21657
by pasj50
Replied by pasj50 on topic 914 1.7 d jet , early type without idle mixture adjuster on ecu.
i realise i havent given many details, so here i go.
i have checked the throttle position sensor , it works fine. fuel pressure is a steady 2.1 bar... , axilary valve is in good working condition and closes completely after warmup.
i have co measurements with a cold engine from about 6.5%, but it does dissapear completely when the enige is warm. air temp sensor is aprox 285 ohms at 20 °C.
will check cilinder head temp sender today
will perform a smoke test to check again for air leaks .
the car has only 60.000 km from new, and everyhing is as original as can be, would you suggest i clean the injectors ultrasonic anyway as the Hydro carbons are only 150ppm? Injectors are yellow as they should be.
I have theasnu injectortester / cleaner and can perform cleaning and testing myself , but some injectors ( especialy worn ones ) do get stuck later on , when you are lucky they will get stuck in the closed position... but open can also happen, so i'm a bit in the twilight zone here regarding cleaning injectors with only 60k km....
thanks for thinking along
best regards Pascal.
about me? well i m a car enthousiast with a big interest in old cars, seven years ago i traded my job for the classic car passion and started my own shop. I have worked on D jet injected cars before, mostly Mercedes, and Volvo , have done another 914, but that one did have a mixture adjusting srew on the ecu... R107's is the car i see most of all. mostly k jet...
i have checked the throttle position sensor , it works fine. fuel pressure is a steady 2.1 bar... , axilary valve is in good working condition and closes completely after warmup.
i have co measurements with a cold engine from about 6.5%, but it does dissapear completely when the enige is warm. air temp sensor is aprox 285 ohms at 20 °C.
will check cilinder head temp sender today
will perform a smoke test to check again for air leaks .
the car has only 60.000 km from new, and everyhing is as original as can be, would you suggest i clean the injectors ultrasonic anyway as the Hydro carbons are only 150ppm? Injectors are yellow as they should be.
I have theasnu injectortester / cleaner and can perform cleaning and testing myself , but some injectors ( especialy worn ones ) do get stuck later on , when you are lucky they will get stuck in the closed position... but open can also happen, so i'm a bit in the twilight zone here regarding cleaning injectors with only 60k km....
thanks for thinking along
best regards Pascal.
about me? well i m a car enthousiast with a big interest in old cars, seven years ago i traded my job for the classic car passion and started my own shop. I have worked on D jet injected cars before, mostly Mercedes, and Volvo , have done another 914, but that one did have a mixture adjusting srew on the ecu... R107's is the car i see most of all. mostly k jet...
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2 months 2 weeks ago #21660
by nordfisch
Replied by nordfisch on topic 914 1.7 d jet , early type without idle mixture adjuster on ecu.
Hi Pascal,
I think it makes sense to clean the injectors. They get clogged not only by runtime, but by lifetime. too.
A car with such a low mileage must have been sitting for manyy years over all.
The alternative will be to make a spray - and flow-test only and not a cleaning.
You have to be careful with the injectors. Yellow ones could be those for L-Jetronic with much lower flow rate or chinese ones that wear the Bosch parts-# but not the Bosch logo.
All D-Jetronic-injectors have a parts-# below 0 280 150 050
Regards
Norbert
I think it makes sense to clean the injectors. They get clogged not only by runtime, but by lifetime. too.
A car with such a low mileage must have been sitting for manyy years over all.
The alternative will be to make a spray - and flow-test only and not a cleaning.
You have to be careful with the injectors. Yellow ones could be those for L-Jetronic with much lower flow rate or chinese ones that wear the Bosch parts-# but not the Bosch logo.
All D-Jetronic-injectors have a parts-# below 0 280 150 050
Regards
Norbert
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2 months 2 weeks ago #21662
by pasj50
Replied by pasj50 on topic 914 1.7 d jet , early type without idle mixture adjuster on ecu.
injector nrs are 0 280 150 009
ecu nr is 0 280 000 013 and Map 0 280 100 019 and following this website they match...
cleaning is in progress, i will test them tomorow if flow rate is ok , for now spray patern of 2 injectors is a bit off.
if injectors are ok, and co is still to low, what are my options then? since it is not adjustible at the ecu?
regards pascal
ecu nr is 0 280 000 013 and Map 0 280 100 019 and following this website they match...
cleaning is in progress, i will test them tomorow if flow rate is ok , for now spray patern of 2 injectors is a bit off.
if injectors are ok, and co is still to low, what are my options then? since it is not adjustible at the ecu?
regards pascal
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