1988 Toyota Pickup Hesitation

1988 TOYOTA PICKUP
175,000 MILES • 4 CYL • 2WD • AUTOMATIC
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MLYON
  • MEMBER
  • 1 POST
At speeds aproaching thirty five mph or under heavy loads the engine hesitates. It idles fine, new plugs and wires, new fuel filter, new transmission filter and fluid. I wonder if the EGR valve could be sticking or have clogged injectors. What should I check first?
Nov 11, 2010 at 10:54 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it
Nov 12, 2010 at 10:43 AM
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