The vehicle: 1991 Jeep Comanche, 2.5 Liter multi-port fuel injection, 4 speed manual transmission
The symptoms: mid-range problem, engine jumps, bucks, cuts out, won't accelerate, occasional popping. If I baby it and just go real easy on the throttle, even lugging the engine a little as I shift gears, I can get it to gradually run all the way up to highway speed without it missing a beat. But, if I push the throttle into mid-range, it does all of the above, in any gear. Or, if I stomp the gas peddle tight to the floor and hold it there, the engine levels out and will accelerate, until I ease off to mid range again, and it immediately starts acting up. Barely runs at mid range throttle. Once at highway speed, it will cruise smoothly with no problem, until I push the pedal to mid range.
New parts installed so far:
Treated with fuel injector cleaner
Fuel Filter
Crankshaft Position Sensor
Throttle Position Sensor
Spark Plugs
Spark Plug Wires
Distributor Cap
Distributor Rotor
Ignition Coil
What's left? Thanks in advance!
The symptoms: mid-range problem, engine jumps, bucks, cuts out, won't accelerate, occasional popping. If I baby it and just go real easy on the throttle, even lugging the engine a little as I shift gears, I can get it to gradually run all the way up to highway speed without it missing a beat. But, if I push the throttle into mid-range, it does all of the above, in any gear. Or, if I stomp the gas peddle tight to the floor and hold it there, the engine levels out and will accelerate, until I ease off to mid range again, and it immediately starts acting up. Barely runs at mid range throttle. Once at highway speed, it will cruise smoothly with no problem, until I push the pedal to mid range.
New parts installed so far:
Treated with fuel injector cleaner
Fuel Filter
Crankshaft Position Sensor
Throttle Position Sensor
Spark Plugs
Spark Plug Wires
Distributor Cap
Distributor Rotor
Ignition Coil
What's left? Thanks in advance!