I've got the wrong ECU for my year...Problem?

[loux951]

I've got a 1970 914-4 1.7...very early car, VIN #4702901167, and I am trying to get the FI system restored. I've just installed a rebuild MPS and a new CHT sensor and still having problems. While researching on Brad Anders' D-Jet webpage I discovered that I have the wrong ECU on my car.

I am supposed to have ECU #0-280-000-007 and I currently have 0-280-000-037 which belongs on a '73 914 1.7 or 2.0. The 037 has the adjuster on the top and, new info to me, the '70 version had no adjustment knob. I'm thinking this is a significant issue.

Also noticed that 0-280-000-015 is for 71-72 cars...will this one work on my car? Does it have an adjustment knob, as well?

Any thoughts?

[hardflex]

Well, if Brad weighs in that is the final word, but since the other parts, like MPS's, injectors and sensors are similar or the same, I think you are fine. The knob is only for Idle mixture adjustment, nothing else.

What kind of problems are you having?

[loux951]

I looked some some on Brad's site...

Failure Modes
Dead: Nothing works. Usually due to major component failure.
Mismatched: Wrong ECU for the engine and/or FI sensors. Causes various idle and drivability problems.
Notes: The ECU is reliable and rarely faulty. Mismatched ECU's are more of an issue (more on this below, see the cylinder head temperature sensor and manifold pressure sensor entries) . Even mismatched, ECU's still often work OK, but may cause some drivability problems.

This is straight from Brad's website..."Mismatched ECUs are more of an issue"

I need to find the correct ECU for my car, then continue to diagnose the problem.

[pbanders]

I also have an ECU cross-reference, I think the 037 works fine in any 1.7. It has a more refined speed mixture control than the earlier ECU's, and you can adjust the idle mixture. I wouldn't change it.