Question about 1990 Pontiac Trans Sport

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Vehicle takes 5 minutes to idle by itself. Why?

Vehicle failed E check because of high levels of Nitrogen Oxide meaning vehicle runs too hot. Temp guage is normal. When vehicle is just started it has a hard time idling but after a few minutes of manually giving it gas it runs fine. What is most likely the problem a heat sensor?

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An inadequate functioning egr system.The exhaust gas recirculation valve uses spent exhaust gases to line the cylinder walls with burnt gases.The purpose of this is to keep the cylinder temperature lower to reduce emissions of oxides of nitrogen.

Posted on Jun 01, 2010

  • Jonathan S
    Jonathan S Jun 01, 2010

    The vehicle temperature may be ok what the e test is referring too is internal combustion temperature is too hot. The egr also can cause a rough idle if it is stuck open from carbon build up keeping the egr pintle from closing.

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Why does my heater blow cold at idle


  1. You May perform the following with the vehicle in park or neutral with emergency brake firmly on.
  2. Check the coolant level when the engine is cold. With proper coolant, fill radiator to top and reservoir to the COLD LEVEL mark.
  3. With radiator cap off, start the engine and let it idle.
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These can be if the vehicle has them cleaned using a special zero residue spray cleaner.

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can you take the car for a long run 75-100 miles.

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