Can a faulty EFI cause an engine stumble?
With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. Here is the list of items on the 90+ that can be sources of this problem (no particular order):
Why is my fuel injection system not working?
Another reason the system wasn’t working is that the “phantom” parallel ignition coil mounted to the front bumper is shorted, and kills the whole system when it’s connected up to the main coil. I have spark and fuel injector pulse now, so since this is a budget operation I’m going to stick with the stock stuff for now.
When to turn off engine to prevent carbon fouling?
When a vehicle is not going to leave soon, turning off the engine will prevent fouling from vehicle idling because it will eliminate carbon deposits. A rich fuel mixture can result in carbon fouling.
What causes engine hesitation and stumble problems on the 90 +?
Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again. The car would then run faultlessly for the rest of the trip.
Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again. The car would then run faultlessly for the rest of the trip.
What was the cause of the stumble engine?
As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition.
Why does my Mitsubishi Starion have engine hesitation?
As another example, I still have a 1987 Mitsubishi Starion, which ran perfectly for 35,000 miles. Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again.