Yea, I know this is NOT a car forum, but I realize many have here have experience with many things. So here goes.
I brought home another Saab last night. Couldn’t resist, it was a steal. It has miss at all engine speeds. I thought it might be a fuel injector, and figured I could pull one off the parts car. I removed all fuel injectors, left the lines hooked up, and put the four injectors into four seperate olive jars.
Cranked a bit with the accelerator down, and got no fuel out any of the injectors. Removed one injector and placed that line into the jar, and still no fuel. (this is on the car with the miss)
I reconnected the one injector, and reinstalled them into the engine and the car started ( still running on 3 cyls. it seems).
Why no fuel squirt when removed from the engine? I still think its a fuel problem. I’ll check timing and do a comp check this weekend.
Mike
Mike
Replies
Does the injector need to be grounded?
No, purely mechanical, like a small version of whats on my JD hoe.
MikeInsert initially amusing but ultimately annoying catch phrase here.
Which Bosch system? There were several. I'm guessing it is one of the "K" series but not sure.
I'd look at the spark first if it is a version of the "K" series. They were pretty brute force simple. It has been twenty years since I worked on one, but there wasn't much there to go bad. If there is a cold start jet, it could be pulsing and cause misfires.
When it's dark out, fire up the engine, and squirt a mist of water over the engine, (a Windex bottle works well). If you get a fireworks display the plug wires are bad.
Examine the cap and rotor. I had a Volvo that didn't have the little rubber gasket at the bottom of the cap, and water would condense inside the cap, and when you started it up, it missed terribly until things warmed up enough to evaporate the water.
A coil that is weak, will also cause misfires.
On a diesel engine if you crack one fuel line at a time and see if it changes that will usaully pinpoint a bad injector. If it misses worse that injector is good. IF it doesnt change thats probably your bad one. I think that would hold true on gas fuel injection.