D Jetronic low to mid throttle surge

Hi Volker,

It's been running that MAP sensor for the last 25 years without an issue until recently.
I'm not sure if R17Gs were Australian assembled, R12s were. Maybe that's why the sensor is different.
I assume that the mechanic used an entire R17G system when re-fitting to the car. That was in '92 and he's forgotten a lot of those details in that time.
I'll check the currently installed MAP soon, and the other part numbers.
We only have one other D-Jet A310-4 in Australia, I'll ask the owner to check his MAP.

Cheers

21571 wrote: Hi Volker,

It's been running that MAP sensor for the last 25 years without an issue until recently.
I
Cheers

Hi Tim,

I've heard such statements numerous times. And I could not disagree more. A 048 is a type 1 MAP sensor without full-load diaphragm. Your car needs the correct type 2 diaphragm MAP sensor plus the other components.

I'll take the fitted MAP off tonight and check the number.
This is my ECU and injector.

Hi Tim,

green injectors (035) and ECU 0 280 000 025 seem okay. Throttle switch no. is stamped on its back. So it will only be readable when you remove it.

Hi Volker,

Thanks for your help.

I'll attempt to pull the throttle switch and other MAP tomorrow.
I've asked the owner of the only other injected A310-4 to check the numbers on his MAP and ECU. He bought that car in France in 1978 and it's completely original

Hi Volker,

The switch cannot be removed without taking the throttle body off the intake manifold, hopefully enough of the number is visible in the attached picture. The fitted MAP is shown also. I believe this to be an original. I have another ECU with the same part number.
MAP number lines up to what you expect.
Perhaps the old one has failed and the ECU etc needs tuning to this one? It has not been used in 20 years.
I have read on your excellent site that fuel pressure is important. I'll borrow a friend's pressure gauge and check. I have another fuel regulator also.

Thanks, Tim.