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1993 Toyota Corolla What's wrong with the vehicle?

Tiny
SMALLFRY311
  • MEMBER
  • 1993 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 106,000 MILES
After driving for approximately an hour to an hour and a half, vehicle will lose power but still run. When at a stop, the vehicle will shudder while in drive. We have replaced the spark plugs, wires, cap, router and ignition coil and the problem went away, but is returning slowly. What do you think the problem is?
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Thursday, July 29th, 2010 AT 9:12 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lack of acceleration, chugging, hesitating, bogging etc. 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.
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Thursday, July 29th, 2010 AT 9:39 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve, throttle position sensor and airflow meter.
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Thursday, July 29th, 2010 AT 9:41 PM
Tiny
SMALLFRY311
  • MEMBER
  • 2 POSTS
The check engine light is not coming on, is there any things on this list we can get rid of?

Thank you for your quick response!
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Thursday, July 29th, 2010 AT 9:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do the EGR valve and TPS
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Thursday, July 29th, 2010 AT 10:23 PM

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