CPU Overhaul Options

[kpax914]

I have a 73, 1.7 liter with everything new or checks out OK on the Fuel Injection. One culprit left the CPU. I'm in El Cajon Area of San Diego. Any rebuilders, besides sending to PelicanParts?

[76-914]

Are you sure? Those are pretty much bullet proof in general. I'm in Temecula and will loan you one to confirm. It's off a 2.0 but should work to confirm or negate your supposition. If your not very well versed in 914's you might want to post up what problems your running into.

[kpax914]

Are you sure? Those are pretty much bullet proof in general. I'm in Temecula and will loan you one to confirm. It's off a 2.0 but should work to confirm or negate your supposition. If your not very well versed in 914's you might want to post up what problems your running into.

Thank you for your recommendo.
Yes I consult the site. Really first class and informative. I post because I have exhausted everything else that could be bad except the vacuum pressure sensor.
I might take you up on your offer. Because the local recycling place (Autobahn, in El Cajon) Let me hook up 2 CPUs that they have that are used. They cautioned me however about the similarity in malfuncton of CPUs. They sold one, which was defective and had to send a customer 3 more! Only one was good. Anyway I hooked up the 2 CPUs and same dproblem with the idle as mine. Advance the throttle and problem goes away.
Thankx
Kpax914

[JamesM]

...I have exhausted everything else that could be bad except the vacuum pressure sensor.

Its your pressure sensor then. They are about 1000x more likely to fail then the ecu.

If it starts and runs on all 4, but just runs badly, its most likely not the ECU

Failure of the diaphragm would mean the ECU already sees full load (or close to it depending on how bad it has failed), meaning that at idle/part load it would be super rich but under some throttle it would be closer to running correct.

Not going to guarantee anything though as idle issues can be quite a few different things, but it is unlikely the ECU is bad.

[kpax914]

...I have exhausted everything else that could be bad except the vacuum pressure sensor.

Thanks everybody for the advise.
Yes I am going to try all the alternatives to CPU replacement. I didn't know you could check out the pressure sensor so simply!
I am retired and I have to watch my budget. I am restoring this great and underrated car. I love this car except for the engine. I am tempted to convert to an AC electric drivetrain.
thanks again everybody for the help

Kpax914

Its your pressure sensor then. They are about 1000x more likely to fail then the ecu.

If it starts and runs on all 4, but just runs badly, its most likely not the ECU

Failure of the diaphragm would mean the ECU already sees full load (or close to it depending on how bad it has failed), meaning that at idle/part load it would be super rich but under some throttle it would be closer to running correct.

Not going to guarantee anything though as idle issues can be quite a few different things, but it is unlikely the ECU is bad.