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No, my fellow zombie Saab fanatics, you can stop drooling.
I'm talking baked Bosch Jetronic ECUs.
I've been having cold start-no start trouble on my '89 NA and have tracked it to the ECU.
But I had a couple dead old ECUs and figured, hey, if it works on central locking brains and headlight relays, maybe it will help here.
But, sad to say, no effect whatsoever.
Both ECUs were ones with serial #s ending in 564, and each had died on me in the distant past, one completely dead, one would start and run car but not rev above 1400 and go into hunting mode if you tried. Neither was helped by jumpering the fuel pump to run all the time.
After the baking, on three wads of tinfoil in the oven at around 290 degrees for 10 minutes, with top galvanized cover off, no change whatsoever.
I'm pleased to note that none of the plastic parts shows the slightest tendency to melting in the oven at that heat. Stink isn't bad either.
I figured that if microcracking is happening in other electronic elements of our older cars, maybe it's hitting the ECUs too, so try a solder re-melt.
I read that heat (275-285F) on here; if it's not enough, maybe I'll give them each another try.
My car still doesn't like to start if it's say below 10 or 15 degrees, but will start fine on mid-20s days, and will start on colder ones if I blow heat at the ECU. Then it died on the road on me and I haven't trusted it since to drive to the indy 25 miles out in the country who has an ECU he'll sell me.
The one in the car now is from a '90 NA, ends in 580. It already has another fault, won't run the fuel pump, but I have a permanent jumper in place grounding the wire to the fuel pump relay when ignition is on.
The other day I put a noid light in one of the injector plugs, not a blink out of it when I cranked the car on a 12 degree morning. Turned my little heater on the ECU and tried again in half an hour and car roared right to life even on three cylinders, noid light flickering away brightly.
posted by 71.173.7...
, Mon, 16 Feb 2015 09:41:23
, Wed, 11 Feb 2015 10:19:03
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