Date: Sat, 03 Feb 2007 14:57:43 -0500
From: Mauricio Tavares <ucenospamgov>
Subject: Re: Saab 89 won't Start starting problem wrote: > I have a 1989 Saab 900 that I just purchased for 300 dollars that has > been sitting for 8 months. The sun roof is open and won't work after > installing a battery. The ignition switch has been re routed as old > key was broken in old one. The accessories (red) wires are attatched > to generic ignition switch as is the IGN (grey) and BAT (blue) wires. > > I can get the car to roll over but won't fire. I do notice that when > I turn the key to the first position the oil light comes on. Then > when I turn to crank that light goes out until I release the key. > This seems weird to me as I thought this key should stay on until > start or when oil pump reaches PSI minimums. > > I was able to just put the key in the first position and then short > out the wires to crank her with red oil light on and still no go. > > I can hear the fuel pump running in the rear and I have sprayed carb > cleaner into air filter box to make sure that something should ignite > and still she doesn't fire. > > The old lady I bought it from said she purrs like a kitten and just > quit at a local gas station and parked it and didn't touch it again. > She seems to think it is air filter related as it happed just after a > new air filter installation and she was told that that was probably > the problem. > > I checked and the wires to the MAF are connected and everything seems > in order but the connection from the air box to the outer MAF seems > like it may be missing a gromett or something. But I don't think this > is the problem because it is on the filter side of the MAF. > > I plan to pull the coil wire off and place it near the block to see if > I'm getting spark there. If weak or none I plan to run a positive > wire to the pos side of the coil and try again. If no spark then > guess I would have to replace coil or the ignition amplifier (where is > that). Also the crank sensor (Oh, my God I hope I don't have to pull > that pulley). > Here are my thoughts, but since I have never done major work on a saab, they are a bit generic and based on my volvo and other cars I've played with. o Check if you have fuel and spark first. Fuel: fuel pump and injectors. Spark: well you know what to do. Is this LH 2.4 or LH 2.2 fuel injection system? Both fuel and ignition get the timing info from the same place. In a volvo that would be either crank angle sensor (2.4) or distributor Hall sensor (2.2). Crank sensor is usually checked by measuring resistance across its connector (I assume the sensor is wherever it wants and then has a wire that then is connected to the rest of the car). o A volvo will start even if its airflow meter is boink. I dunno if a saab will but since the fuel system is the same... o Check all hoses to see if there is nothing funny. o Both ignition coil and fuel injectors work by grounding its ground wire. The ECU does that for the fuel injectors while the amplphier does it for the coil. You can kinda test them with a test light or multimeter: o When power is on (engine not cranking), you should get 12v using the engine as ground. o When the engine is being cranked, if you connect the pair of wires that go to the coil's primary/injector, it will pulse. In my volvo it seems to be pulsing around 9V but I attribute that to the reaction speed of my cheapo multimeter. > Have I missed anything here? I also may try to unhook the ECM and re- > connect in case that is a problem. Any suggestions would be greatly > appreciated. Any of you out there that have free cell phones on Sat I > would love to hear from you. My free cell number is 7 0 6 8 2 5 7 1 8 > 0 > 0 > > Thanks. > > Mr. Tripp > Augusta, GA > > 1989 Saab 900 (s) I think. > w/automatic trans > > PS I also can't get the trans out of park. Is there a switch or > something? > I've seen many cars that have a normally open switch on the brake pedal. When pedal is pressed, switch is closed, and you can then move the shifter lever. What about switches on the lever itself? Once again, do understand that there are people here who are orders of magnitude more knowledgeable than me in saabs. -- Mauricio raub-kudria-com (if you need to email me, use this address =)

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