• Tiny
  • crawfor.caleb
  • 1987 Toyota Supra

Engine Cooling problem
1987 Toyota Supra 6 cyl Front Wheel Drive Manual 90566 miles

my car is making a weird sound when I shift to second and third it feels like it is bogging down

Do you
have the same problem?
Friday, November 20th, 2009 AT 1:08 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

You sure the clutch is not slipping? If not check and test the following below

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

Was this
Friday, November 20th, 2009 AT 1:25 PM

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