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Hi all,
I have gotten some great advice on this BB before, so I'm hopeful someone here can help.
My Mom's (complicated) 1990 900 base, 5-speed, 3-dr. (non-turbo, 16V LH 2.4) left her stranded in a nearby town. It died suddenly after running about 2 minutes or less. I arrived on scene, leafed through her Bentley 16V SAAB manual and performed a few checks. Engine WAS getting good, bright blue spark. Fuel pump had been replaced just back in April w/Bosch part. No voltage was getting to fuel pump during starting attempts. I have a "noid lite" to test the signal to the fuel injectors, and they were firing, so I suspected fuel supply, not LH-system computer.
The Bentley test for fuel pump circuit (the one about jumpering together fuses 27 & 30, hazard lights and fuel pump fuses, respectively) immediately got the fuel pump running, so we limped it home like that. It ran great, actually. We just had to remember to pull the jumper wire out once we got home, so the pump wouldn't run all the time!
So, thinking it was a faulty fuel pump relay, I ordered one, put fuses back in place, pulled bottom of dash out, popped in new fuel pump relay(not easy on LH 2.4 cars, eh?) and, NOTHING. It sputtered once, but wouldn't start. Same symptoms as before. ARRGH! (Car will still start and run with 27 & 30 fuses jumped, as above, if need be. I made sure of that!)
I tried the second fuel pump circuit test--for volts across terminals 85 & 86 [I think] of fuel pump relay--since I already had the lower dash panel out, and that's when I found that the relay was not getting the ground signal from the LH-Jetronic computer. So the relay wasn't the problem. That's as far as I got. I couldn't test the LH-Jet connector circuits as per Bentley tests, because I have only a digital volt-ohm meter, not an LED test light like the Bentley calls for. (I sure didn't want to test w/my regular 12V test lamp and fry everything!)
I also tried swapping the LH-system relay with new fuel pump relay, since the '90 owner's manual says they have same SAAB part # (and they were same part-numbered relay upon extracting them). Still nothing.
Any ideas? I know that if the LH-Jet doesn't sense an ignition signal, then it will keep the fuel pump from operating. Do I need to grab a $2 LED test light from Wal-Mart and get cracking on doing the (long) Bentley list of LH 2.4 tests? Or do I have an ignition problem, despite having spark?(Sometimes I wish her 900 was an 8V like mine!)
Any help will be greatly appreciated!
TIA,
Micah in NC
'84 900S, 216K mi.
'90 900, 67K mi. (the problem one)
posted by 216.77.233...
, Tue, 30 Jul 2002 11:12:29, Mon, 29 Jul 2002 14:06:03
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