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The people at John’s Cars (page 715) say they will test your ECU for you, free of charge. They are confident you will
eventually be buying something. They add, however, that since testing requires a car, there may be a few days’ delay
until they have a car with the correct system on hand for the testing.
Of course, you can probably learn a lot yourself if you have a friend with a car similar to yours. Swap the ECU’s and
see how many problems go with them.
If your ECU gives up the ghost, please see the comments under Performance Mods (page 309) before spending the
major $$$$$ for a new one. Also, you might want to contact AJ6 Engineering listed on page 710, or Corsaro
Electronics on page 704.
If you wish, you can open the ECU easily enough; it is a simple cover-body-cover sandwich with several screws
holding it together. Note that a couple screws have aluminum caps that serve as a tamper indication; it might be wise to
inquire about policies regarding exchanging an opened unit before opening.
Take precautions to avoid static electricity discharges while inside this unit. Usually, it is sufficient to keep one hand
on the chassis while working.
EFI WIRING HARNESS TROUBLESHOOTING: Matthias Fouquet-Lapar suggests “one thing I would do is to put
in fixed resistors for the various sensors direct at the ECU connector” to find out if there’s a problem in the harness.
INJECTOR CONNECTORS -- D JETRONIC: The connectors on the early cars are a simple plug that inserts into a
rectangular recess on the injector. If you need new connectors of this type, Ed Sowell says you can get them at NAPA.
“They have what they call "harness rebuild" parts which is a selection of connectors and pigtail wires with various
connector styles. You buy the connector body and the pigtails separately, and assemble. Be sure to ask for "harness
rebuild parts," as you will get nowhere asking for injector connectors. The NAPA numbers are:
housing 2-17411 (this is the plastic connector body)
contact 2-17421 (this is the pigtail with the connector attached-- 2 req'd per connector)
Also discovered that NAPA has the contacts themselves without the pigtail wires.”
Tom Simon says, “I have located a source for the injector connectors for pre-HE engines. They were ordered from
Fuel Injection Corporation in California. Their web site is
www.fuelinjectioncorp.com
. The connectors are part
number 920155B; they are black rather than the original white. The terminals with no wires are 920121B. They also
have the boots (920125B) for the connectors. I ordered 20 connectors, 14 boots, and 50 terminals. The total order
including shipping was less than $35.00.”
INJECTOR CONNECTORS -- DIGITAL P: Apparently Bosch decided the simple rectangular plug wasn’t secure
enough, so they developed a much more sophisticated connector for the Digital P system. These connectors are a
rectangular hard plastic box that fits around the connector on the injector, and they have an external spring to provide
snappage. These connectors simply pull off, although they can be a real bear sometimes. It might not be a bad idea to
apply a little grease or something to that spring or the little point that it snaps around to help get it off next time.
These same connectors are also used on the Digital P temperature sensors.
According to Peter Cohen and others, NAPA offers this connector in parts or as an assembly. The assembly, with
pigtails hanging out, is part number 2-17424. In parts, the numbers are
Housing - 4 per box
2-17416
Spring Clips - 25 per box
2-17417
Terminal Ends - 25 per box
2-17418