1991 Toyota Pickup HIGH SPEED MISS

Tiny
SUPRA222
  • MEMBER
  • 1991 TOYOTA PICKUP
  • 6 CYL
  • 4WD
  • MANUAL
  • 140,000 MILES
Occasionally, misses at all different speeds/rpms, whether cold or hot. Drops 1500 rpm and comes back instantly causes banging on rear end. Started doing this after driving a rough wash boarded road. Been doing this for 4 year but is getting more frequent and severe in rpms drops and recovery laterly, especially since replacing the distributor. Have replace ECU, distributor, cap and button, plugs and plug wires, mass air flow sensor (MAF), spark igniter, coil, fuel filter, pulled/tapped various wires/connectors tried premium gas. Only recently I started getting a Diagnostic code of 31 (MAF), I had the same problem without code previously. Unable to clear the code even after taken battery cables off.
Wednesday, March 24th, 2010 AT 1:57 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test all the following listed below and get back with some testing results we start here

Oxygen sensors.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position 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.
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Wednesday, March 24th, 2010 AT 3:07 PM

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