'74 EFI woe

[ray greenwood]

I can help. The d-jet should have two identical relays, both of which have to function for the pump to run. One is main power, other is pump. The first is under the dash by the master cylinder by your knee. The other should be the first relay in line under the hood on the left hand side. They are identical relays. As for parts under the hood. The control unit should start with 022 prefix. The letter designation on end should be "E". The correct distributor should be 022 905 205 P. There are several advance units. If it is dual vacume , it should be arm # 917 and have an outer adjustment screw stop. The pressure sensor should have two small hoes on the step of the back side opposite the vacume line...and have an "E" letter code. I will drop part #'s in tonite around 9:30 central with #'s for sensor #1 and #2, whole part #'s on pressure sensor, deceleration valve, throttle valve switch, aux. air reg. and fuel pressure regulator. There are a few things that can be mixed and matched. You can also use a late model B or C pressure sensor, but they must be re-adjusted. Ray

[ray greenwood]

Oh by the way, I would not go to carbs. M504specs and Bob Ingman and myself...between us can probably help you get situated on a harness. A note: what month was your 74 produced in, and what is the shape of your air cleaner. Most 74's had L-jet on them. If someone changed you over, that is OK...as long as all of the parts were changed. There are some differences in fuel pump, injectors and regulator also. Don't give up. This is excellent injection if you learn how to work on it. Ray

[herr_sparky]

ray, youve now supplied me with more comprehensive information on this car in one day than Ive been able to scrape together in five years of driving it around & picking the brains of VW-zoids. Excellent. Tonight Ill be flushing out the pump and recording part numbers for reference tomorrow. And thats all I needed to hear on the carb issue, I think I can make this thing work again as is.
p.s.
I cant remember the manufacture date, but my engine code is EA-, and the air cleaner is a paper donut shape. As for parts, my immediate need is for a couple of sensor MPCs (cold start, thermo-switch)which were melted apart with an overzealous soldering iron. other: screen for air funnel to the fan, tail light lenses(both), CV boot right side, carpeting, emblem,chrome trim pieces, etc. thanks.

[m504specs]

I just photocopied a really lovely reference to the d-jetronic specifically for VW type 4's from the library. Also, I am amassing many many other references. Bosche has a handy little book on fuel injection that may help you identify what system (s) you are facing. It's a great starting place. Barnes and Noble and other major chains carry it. As well the library usually will have a copy in the reference section. There is really useful information on the d and l jetronic systems on the Porsche 914 forums. and in one of the earlier posts, Roland Kunz and one other fellow, posted some amazing links to parts lists. Hang in there.

[herr_sparky]

my '74 412 2-door fuel injection system (d-jetronic) was messed with by the previous owner and is now equipped with mismatching parts, wiring, hoses, etc., apparently in an attempt to get the thing running again. I bought the car very cheap because he suspected the control unit to be faulty, but I doubt it. I have some information on diagnostic procedures for this system, but Im also looking for anyone who may know about incompatabilities between components. Id also like to know exactly what part number is appropriate based on my engine code and chassis number, is there any way to reference this? I also have a '73 wagon with the same EFI system to see for comparison, but the actual wiring of it seems to be just a little different. where the hell is the fuel pump relay? Has anyone dealt with rewiring this stuff before? How can I have my control unit tested? If I need a new wiring harness, where do I source that? Should I bag the whole thing and bolt on carbs? help. thanks.

[herr_sparky]

thanks everyone -- last night the fuel pump was pumping and the spark plugs were sparking, and all relays working right. I even got it to fire a couple of times by dripping some gasoline into the intake air. good times.

[Roland Kunz]

Hello

The other guy was Brad Anders at http://members.rennlist.com/pbanders/djetparts.htm

We usually "hang" around on the 914 and 912 sections from Pelican or Rennlist.

Grüsse