WHAT ARE SOME OF THE CAUSES FOR VEHICLE TO*****

  • Tiny
  • hattsy
  • 1999 GMC Yukon
  • 165,000 miles

Between 45-50 mph truck****** while going uphill or overpasses

Monday, December 5th, 2011 AT 7:58 PM

4 Answers

  • Tiny
  • rasmataz
  • Member

Do you have a check engine light?

What exactly is it doing?

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Monday, December 5th, 2011 AT 8:02 PM
  • Tiny
  • hattsy
  • Member

No engine light When taking off when the truck reaches 45-50 it****** then levels off. When going uphill or over bridges it****** or acts as if getting no fuel

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Monday, December 5th, 2011 AT 8:31 PM
  • Tiny
  • rasmataz
  • Member

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.

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 and keep testing.

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Monday, December 5th, 2011 AT 11:30 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,118 posts

Hattsy, did you get this fixed yet?

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Saturday, February 11th, 2012 AT 6:47 AM

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