More ECU/MPS/CHT..., From the other side of the pond Options

[chmillman]

I didn’t want to hijack the thread below this one started by Jose, so I am starting a new one (sorry if this is not a good idea).

I am also having some work done on my 2.0 D-Jet and some similar issues. My car is officially a ’74 – built on 1 November 1973 - but it has a ’73 (Euro) engine number (GB007311) as well as a ’73 ECU and MPS (both 037). I have been unable to get any info from Porsche as to whether the motor is original or not - as the car was built in late '73, it might be original, but the car was restored in France in 2011, no idea if they changed the motor or not.

Back to the FI- in addition to cleaning and testing the injectors, changing the hoses, etc. my FI guy has found and fixed a bunch of stuff – frayed and dicey connections etc. He is however unable to get the ECU tuned so that both the CO and HC values are within their suggested ranges at the same time. The car has some light hesitation at low speeds and loads - like when driving at a steady state in a 50kmh city zone.

The MPS checks out OK both for vacuum and static resistance tests. It was rebuilt by Fuel Injection Corp. in CA in the summer of 2014 - culdn't get any more info than that from them.The 270 ohm ballast resistor is there and OK. My FI guy thinks it might be one of those fairly rare cases where some components in the ECU are cooked. Pulling it out of the car and sticking your nose inside the connector hole, it smells a lot like old overheated electronics – in comparison to a couple of others he has in storage which hardly smell at all – or maybe a bit of a musty smell.

I have another ECU in good condition to test – but it’s an 0 280 000 040, not an 037. It does have the same VW part number - 022 906 021 E. According to the info I found this is also supposed to work with an 037 MPS…





Maybe doesn’t need the 270 ohm ballast resistor on the CHT sensor. Anyone have any experience with this? This is Euro stuff I know, so some of the USA model info will not apply.

Speaking of the CHT sensor, that is also wrong. It’s not an 017 (unobtanium), but it’s not an 012 either. IIRC it’s an 003 – which I have seen various info about, some of it conflicting. Richer at cold start or remedy for excessive fuel consumption... In any case I think we will replace that with an 012, as an 017 seems to be out of the question.

More coming as we progress on this hopefully this week.

[emerygt350]

The 037 ECU, as far as I can tell reading the histories, is the same as the 1.7 of 1973/72(?). All they did was put a little cheater spacer in the 037 mps and tuned the mps for the 2.0, and of course added the resistor in the cht wire.

My car has a 2.0 (GA) bumped up to 2056 and a 8.8ish to 1 compression ratio.. I have an afr and notice the ECU bumping the mixture around even after the car is more than warmed up. Between temp sensor 1 and temp sensor 2 I suspect the Germans were really looking at micromanaging the mixture for whatever reason. Perhaps because they could. I have put Bluetooth controlled variable resistance in that cht line so I could richen it up on the fly. I didn't notice a 300 ohm rule. I could go below that and further lean the mixture.

Anyway, wish I could send you my extra 037 for testing but shipping would be silly expensive.