'93 240. The starter cranks slowly and after 1-2" the car starts. I have been bringing this car back to life after 3 years of sitting. Runs great, I assume both fuel pumps are running well since it doesn't matter if the fuel tank is near empty or full.

Wonder if it is the fuel line check valve, however it does the slow crank even if I restart it immediately after turning off.

I have cleaned all the ground connections. The only other thing I noticed is that both the alternator and starter are not original. The alternator seems to have an extra red wire coming from it with a clip that is not attached to anything. The oil pressure sensor has one wire from the alternator attached and has a place for an extra clip - it is a larger silver-ish cylinder that is different than the one on my other 93 240.

I was going to attach the extra red wire to the extra clip on the oil pressure sensor, but thought I would check first. Anything else I should be looking for/testing regarding the slow cranking?

thanks,
John