Update: New "used" Fuel ECU same problems If it stumbles or dies then look really close at which ever item you fiddled with. Try wiggling/tugging at the various connections while the engine is running. The fact it'd run sometimes would tend to make me think it has an iffy electrical connection somewhere. I would not immediately jump to replacing them but rather test all the components/sensors & their electrical connections to the ECU. The ECU's (there are two) are pretty robust. The most common issues with our cars are intake air/vacuum leaks, poor grounds & faulty electrical connections. It is rumored stray electrons thus introduced can be detrimental. Just make sure not to apply your ohm meter to the computer itself. If you add PapaJam's wire diagrams to that info you can do a volt/ohm test at the computer's harness connector to make sure the electrons are getting all the way through the wire harness to the computers. It includes the ohm or volt readings you should need. The link in my signature will take you to a page of information about the L-jet system in our Spiders. Which one fires the injectors? I know the ign ecu fires spark but which for the injectors? If the car fails to act up long enough for testing the only thing I can do is go on my professional feeling and at min replace the ignition ecu. does any one have this? I know paperjam has better diagrams but I still need reference values. At this point I have no need/use for wiring diagrams I just need pin outs for complete inputs/outputs to/from ignition ecu with VALUES. Their diagrams are also a huge mess to follow. The alfa service manual is lacking way to much it almost seems it was designed for not so in depth techs to me at least. With that said the diagrams do not help when no electrical values are given, ie: just because I probe lets say pin 8 ( no real test just as example) on the connector not attached to ecu and lets say I where to get 7vdc this doesnt mean anything without something to compair it to. I'm still almost sure of a faulty ignition ecu but I need to test inputs to it first. I cannot test inputs to ecu for problems I explained so far until problem is there. Today went out to start, no start no inj pulse 1 min later had inj pulse, car ran idle for 5 mins and died then, started back up and now has not stalled since. He got home that night and the car started and ran perfect with no stall, 2 days later he tried again and drove it with no problems, I explained to him do not drive it as the problem is still there, now the car is here at my shop. She then ran for about 10 mins then died and had no inj pulse again and no start, I called my friend/customer and explained it needed to be brought to my shop. I had a hunch it was a faulty ignition ecu so I started taking panels off to gain entry to check harness connections, all where nice clean and solid, put back together still no inj pulse/no start then all of a sudden it started and had good inj pulse. Well my friend after receiving the 1988 alfa romeo spider veloce back after about 3 weeks called to explain it wouldnt start, I went over and started diagnosing the problem, no spark and no injector pulse was found, I then checked all grounds except for ecu's and checked to make sure battery fully tested and enough voltage during cranking and tested both crank/flywheel sensors all tested good, moving on I all of a sudden gained spark where before I had no spark from coil and no spark of corse at plugs but then all of a sudden I had perfect spark out of no where, tried starting, still no start found I still had no injector pulse.
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