91 Mitsubishi Mighty Max stalls during acceleration
It starts and idles fine, but while acceleration out of 2nd into 3rd, it struggles to go. It will stall completely unless I go back to 2nd gear. It also pulls hard to one side, so I thought maybe the brakes where sticking, but they are fine. It has a new clutch kit, so I made sure the pressure from the clutch pedal was adjusted correctly, and it was. I checked the transmission fluid level, it was fine.
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Next time when cold and it will not start remove a spark plug or two and see if the engines flooded. If so there are two things that come to mind; 1, worn injectors, leaking as engine sits with time causing difficult starts 2: bad oxygen sensor, if failed engines tend to run rich and the ECU may have your injectors pump heavy amounts of fuel to keep from running lean; often times you'll see poor fuel MPG if O2 sensor failed.
White smoke during acceleration is usually the result of a "blown" head gasket. Antifreeze getting into the cylinder is the cause of the white smoke. Check the coolant level, if it's low you have the problem.
It sounds like your balance belt might be broken. I have a 1991 Mighty Max that experienced the same problem. My water pump started leaking and as I was replacing it, I discovered the balance belt was also broken after removing many parts on the front of the engine in getting to the water pump. It's a small rubber belt that turns opposite of the crankshaft to keep the engine from shaking at idle. My engine is still torn down, as I don't know how to replace the balance belt. Sure could use some advice on this repair.
If you have a carburator still then you need to know more.
screwdriver method on feel/rpm gauge
Proper exhaust measurement.
Run her up to 650 rpm idle start adjusting mixture screw until max rpm obtained. back out a bit too be lean. Ajust Idle screw again for 650.
Turn on appliances as lighting and airco. If engine starts/tends to stall, vibrate increase the idle a bit more.
You are not ready with the engine if not doing ignition settings and valve clearances as well, etc.