I have a saab 900 which last year I added some old octane booster a friend gave me. He told me it would be fine, but after that, the car has not run. I’ve drained the tank, and I ran the gas through another car, which seemed to run ok. The car has passed a fuel volume test, i ran it after replacing the fuel filter. I’ve also replaced the rotor, plugs, cap, wires, and cleaned the AIC valve. On the AIC valve and checked it’s electrical resistance, it tested good. I added hose clamps to many of the hoses and lines. I searched for vacuum leaks. I have some photos and a video of the car and how it runs. xenop.us/saab/
Unfortunatly the engine is not throwing any check engine codes. I tried checking some of the voltages at the fuel injection computer and ECU unit wiring, but didn’t find any problems. The car has Bosh LH 2.4.2 fuel injection. It also has an air mass meter. The car is supposed to default to running at a high 1000-1600 rpms when the AMM is disconnected ,however it would not start with the amm disconnected. Therefore I think the problem is something else.
I think it could possibly be a blown head or bent valve or something like that. I was thinking about getting an compression test kit and a timing gun, since I replaced the rotor and cap. I’m looking for advice on what I should check next?