Alfa Romeo Bulletin Board & Forums - View Single Post - 86 Alfa Spider Veloce Ignition Computer (Behind Driver and Passenger Seats)
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post #6 of (permalink) Old 05-11-2017, 12:30 PM
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Join Date: Oct 2005
Location: Mebane, NC
Posts: 16,257
OK, removing & replacing the plug from the computer isn't doing anything. Well, it gives you something to do that makes you think you've done something...

Again, trying to be very clear, when you turn the key to 'start' does the engine make the normal R-R-R-R sound or does it sound abnormal? A known problem area is the ignition switch itself. When they get old the internal contacts are not able to reliably pass the electrons needed to activate the starter motor. At first it is an occasional problem (say 1 out of 10 starts) then before long it becomes 1 out of 3 starts. There are two ways to fix this. One is to replace the ignition switch. They are not cheap and the replacements may not be of the best quality. The other way is to add a relay such that the ignition switch only has to pass a tiny amount of electricity to trigger the relay. This canmake a dodgy ignition switch work fine for many years.

If you turn the key to 'start' and the starter motor is activated (R-R-R-R-R) but the engine will not start then there is another issue that needs to be addressed. Go through all the checks outlined in the Spider L-jet Diagnosis page (link in my signature). Things to pay particular attention to are system voltage (the computers need about 10.5V to wake up and send the make spark/squirt fuel signals). It can sound like it is cranking over fine but if system voltage is below that threshold it will not start. Dirty battery connections or a slightly weak battery could affect system voltage. There is a stand-alone Cold Start System (not under computer control). It is supposed to squirt a little extra fuel on cold start and NOT squirt extra fuel on warm start. It can fail either way, both ways, one way but not the other, etc. The fuel injectors require properly regulated fuel pressure. A failing Fuel Pressure Regulator can make it hard to start cold or hard to start hot.

One other thought. There were a couple of slightly different computers used during the run of the Series 3 Spiders ('82 - '89). They will physically interchange but they might not be totally compatible. Post the numbers on both of your computers and we'll see if we can figure out if they are the correct ones for your model year Spider.

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina

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