Haltech F3 ECU. HELP!

[105Alive]

Hello everyone,

Having finished the six year restoration of my 105 2000 GTV recently, i found myself with time on my hands, and accidentally bought a 1979 Fiat X1/9 to play with. I'm sure a few of you have had similar slip ups over the years. 

The car has not run in many years, and as we've gone through the process of resurrecting it, we're having issues with the ECU. It's a Haltech F3 ECU (fitted in '92), so I just thought I'd put the issue to you guys in case you've had any experience with them.

The ECU is "not giving any negative pulse out of the injection harness" though it is giving positive, so we know it's getting power, according to my mechanic. All the wiring seems to check out as well, so the issue is with the ECU itself. Haltech are telling me to buy a completely new system though, as they no longer support the F3. This is obviously going to be an expensive option so, do any of you know of anyone that might look at repairing the F3 system? Or do any of you have an old F3 lying about that you'd sell? (Hopefully I know). I'm based in Sydney.

Any ideas would be great.
Thanks

[Duk]

So you are saying that the injector outputs give a positive voltage pulse???

I'd take it appart and look for dud capacitors, dud back emf diodes (it they're used) and probably dud output transistors.
Being that old the thing will more than likely have thru hole circuit board(s). Hopefully the transistors still have their identification on them.

[As the day goes]

Old electronics-oh joy!!!!:  And if you do find a new ECU, as it has been laying around for 38 years, likely its capacitors will have dried out too.

Best to take into an electronic specialists, maybe one who fixes hifis.

[105Alive]

Hi Duk,

I've clarified with the mechanic. The unit is giving no pulse at all. Thanks for the suggestion, I'll open it up and see if the capacitors, etc are at least numbered and can be replaced. At this stage it's looking like no one wants to deal with such an old ECU though.

Thanks 'As the day goes,' for suggesting Hi-Fi places. I wouldn't have thought of that in a million years. I'll give it a whirl.

Thanks for your advice guys.

[Duk]

Give it a go yourself.
Follow good anti-static precautions, a decent little soldering iron and a solder sucker. The capacitors are the first things to replace. Even if they look OK, replace them anyways.
Then try and identify the output transistors and also look at the internal voltage regulator to make sure that it is providing (probably) a steady 5 volts.

The thing is so old and not working, if you get it running properly again, AWESOME! But you're 1 foot in the 'Need a New ECU' camp already, so what's the worst that could happen???
You may even learn some new and valuable skills. 

[Jekyll and Hyde]

Is the ECU getting an RPM signal?