Volvo ECU - VW MAP Compatibility

Hi Dr. D-Jet,

Greetings from SC, USA!  You have a fantastic website; it is a great resource! Thank you for sharing your extensive research!

I have a 1971 Volvo 1800E (184353-035572), but many of the D-Jet fuel injection components have been replaced and are not original to this model.

My B20E engine has a thermal timer added to conrol the cold start valve.
My ECU is a Bosch 0 280 000 034, which I believe is the correct version to use with the thermal timer.
My manifold pressure sensor is Bosch 0 280 100 001, which I see from your site was used on a VW Type 3. The tamper proof screw is intact.
My throttle position switch is Bosch 0 280 120 039.

Do you know if the pressure sensor used in the VW is compatible with the Volvo ECU?  I am not experiencing any obvious issues, but could this lead to other less noticeable issues?

Thanks for your assistance!

Vielen Dank for the fast reply! I do already have the external thermo time switch installed. I will start the search for a good working 0 280 100 035 MAP sensor. Thanks again for the assistance!

Regards, Jeff

Hello Dr. D-Jet,

Is the 0 280 100 035 MAP sensor specific to the B20F engine? I have a B20E, but many of my D-Jet components have been swapped out with parts from later models. My ECU is 0 280 000 034. Could you please advise whether 015 MAP sensor or 035 MAP sensor would be a better fit?

Thanks again,
Jeff

Hi Jeff,
are you sure you have the B20E with higher compression? The european engine?
Here is, where I found information about the B20E / B20F : oldtimer-foren.de/viewtopic.php?f=4&t=22926
I think, a page translator could help you.

As I saw there, there are different camshafts: automatic /hand-shifted are different.

I think, for the B20E the 0 280 100 015 would be the correct fit.

But, you will have the problem with the insufficiant octane in the fuel: The european engine was built for at least 98-octane.
We had the problems here with motor-ringing many years before when the leaded-fuels were not sold anymore, but can buy fuel with more than 100-octane here nowadays.

I hope, @Jörg takes notice of your problem soon, he has better knowledge than I can find in the web.
Or: send him a P.M.

Regards
Norbert

I have spent some time studying the Volvo 1800 parts manual, and see that Volvo used several Engine/ECU/MAP sensor combinations. With the help of Dr. D-Jet's excellent tables I can now cross reference the Volvo part numbers to their Bosch part numbers. Here is what I have found:

In 1970 1800E chassis number 30001-32799, Volvo used B20E engine with ECU 241727 (0 280 000 009) and MAP sensor 241725 (0 280 100 010).

In 1971 1800E chassis number 32800-37549, Volvo used B20E engine with ECU 243182 (0 280 000 017) and MAP sensor 241725 (0 280 100 010).

In 1972 1800E chassis number 37550 and on and in 1972-73 1800ES, Volvo used both B20E and B20F engines with a thermal timer.
For B20E, ECU 243315 (0 280 000 034) and MAP sensor 243183 (0 280 100 015).
For B20F Manual transmission, ECU 243315 (0 280 000 034) and MAP sensor 243316 (0 280 100 035).
For B20F Automatic transmission, ECU 243315 (0 280 000 034) and MAP sensor 460866 (0 280 100 054).

I have a US 1971 B20E engine with the D-Jet components from a 1972 B20E engine, so I believe MAP sensor 0 280 100 015 would be the best fit for me.

If anyone can confirm or validate this, I would be grateful!

Dr. D-Jet, thank-you for checking your stock, I will look for a US supplier, but will let you know if I do not find one!

Thanks, Jeff

Ok, thank-you!

Hello Jeff!


I have only just read your questions, as I have been busy installing air conditioning in my Volvo 1800E (1971, 37136) for a few weeks now. BTW: The original Volvo FrigiKing under dash unit with new components.


Norbert had already asked which engine is installed in your car. The answer is crucial. Please check the engine number, then we can determine in the next step which components with which BOSCH numbers should be installed in the corresponding D-Jetronic system, which are compatible and which have been installed by mistake.


According to VIN 184353, the Volvo was originally equipped with a Moto B20E for the US market.


Looking at the pictures of your engine compartment, I detect at least three "improvements": Valve cover, hot air intake instead of cold air intake, thermal timer. According to the color, the engine has been revised, maybe even replaced?


Here you can find my table with number and type of engines:

www.v1800.org/index.php/en/workshop-en/2...designations-en.html


Good hunting


Jörg

Hello Jörg!

My engine type is 496940, which is a B20E, and the production number is 4678. I have confirmed with Volvo Historical Archives that this is the original engine for my 1971 car VIN 184353 (a surprise)! I have also checked the shape of the head over the exhaust ports, and it is still a B20E head.

You are very perceptive; it does look like the engine has been reworked. It has a thermal timer installed, ECU 034, and a fuel injection harness with the wires for the thermal timer, which are all parts from circa 1972-73 I think. Sometime after the 2007 pictures were taken, the fuel hose routing, fuel rail, and fuel pressure regulator have all been changed to match the 1972 configuration with the regulator mounted in the fuel rail. Also, the aux air valve has been removed and replaced with a manual ball valve and cable to the cabin.

These all occurred before I bought the car. I got the car about a year and a half ago, but since it was running pretty well, I did not focus on these things. I have since removed the hot air intake and restored an original air filter in the front with a duct to the manifold. I fit the intake air temperature sensor back into the back of the air filter.

Since discovering I have a VW MAP sensor, I want to get a more appropriate one installed, and then replace the AAV.

Thank you for any tips you may have, and good luck with your AC!

Jeff