Can a MSD unit misfire above 3000rpm?
Check voltage at higher RPM’s it should maintain above 10 Volts, if voltage is falling too much this can cause a miss. The wires that go from the MSD unit to the distributor, make sure these wires are not close to any other power wires, try to isolate these wires away from any other power wire or spark plug wires.
What to do if your car misfires at 3000 rpm?
If you have any electrical component like an electric fan or water pump try to shut these items down for testing purposes and see if it clears up. Try reducing the plug gap by .005 increments and see if it improves. These items can cause the engine to miss at higher RPM’s.
When does the engine miss at 4000rpm?
The engine misses/bucks (it is as if a gremlin is switching of the ignition) at just over 4000 when cool (block temp not water temp) as the block temp rises or load duration (climbing a grade) the miss/bucking will drop to around 3000rpm.
What are the most common signs of engine misfires?
The most common situation to notice misfires is on high gears, low RPM, and the accelerator to the floor. Rough acceleration is a typical sign that your engine is misfiring.
Check voltage at higher RPM’s it should maintain above 10 Volts, if voltage is falling too much this can cause a miss. The wires that go from the MSD unit to the distributor, make sure these wires are not close to any other power wires, try to isolate these wires away from any other power wire or spark plug wires.
If you have any electrical component like an electric fan or water pump try to shut these items down for testing purposes and see if it clears up. Try reducing the plug gap by .005 increments and see if it improves. These items can cause the engine to miss at higher RPM’s.
The engine misses/bucks (it is as if a gremlin is switching of the ignition) at just over 4000 when cool (block temp not water temp) as the block temp rises or load duration (climbing a grade) the miss/bucking will drop to around 3000rpm.
The most common situation to notice misfires is on high gears, low RPM, and the accelerator to the floor. Rough acceleration is a typical sign that your engine is misfiring.