Volvo 1800ES D-Jetronic MY73

Hi Pierre,

yes Throttle switch is an early version with scres and soldered wires inside.

Hi Pierre,
you could use an alternative pressure regulator like this one: www.ebay.de/itm/233599329216 or this one: www.ebay.de/itm/272270476505
This cheap item could work, too: www.ebay.de/itm/373722429530?hash=item57...tkp%3ABk9SR_yr-KGtYw

Regards
Norbert

Vielen dank Norbert !

the first one seems perfect !

Today I took some time to have a 30 km ride with the ES.
The car is now fine to drive, fuel consumption seems reasonable. Thank you to you all for help and assistance !

One point is still not perfect : when the car quits its place, during clutch coupling and just after, the car hesitates, just one second. It was worse before cleaning and adjusting throttle sensor, but it still hesitates. I can't say if mixture is too lean or too rich just at this moment. I know that ECU enriches mixture at this specific moment, and the engien runs smooth. So I would say that it's a bit too rich...

I will test again tomorrow with the ECU enrichment knob fully turned anti-clockwise to lean the mixture. Unfortunately I can't measure any more CO level so I'm blind about that for the moment.

Any advices ?

Hi Pierre,

rheostat is only active when throttle switch idle contact closes. Is that properly adjusted? And of course you should measure exhaust gas.

yes it is properly adjusted. Idle contact closes immediately when throttle opens.