Question about 1994 Nissan Sentra 4-Door

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My nissan sunny GA15DE was overhauled but started having rough idle immediately threafter. what could have caused this? Gerald

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  • girungu May 02, 2009

    i sorted this out. it was one of vacuum pipes that had been put in the wrong place.



    also if your engine is smoking endlessly and emittting oil from the exhaust even after overhauling, the cause of this is the valve on the cylinder head top cover that is linked to the intake manifold. it allows oil to be sucked together with the air/fuel mixture and burnt together hence the whitich thick smoke at high rpm's. i replaced mine and the smoke disappeared.



    Gerald.

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  • Nissan Master
  • 3,433 Answers

Gerald:Was the engine overhauled because of the smoking problem? If so, the auto trans solution is more likely your problem. Good Luck

  • Automatic transmission? - Check vacuum line to transmission . The only line of rubber going to trans. Located where it attaches ro trans and rwmove it watching to see if it contains any trans fluid. If hose has oil in itm Then replace the valve it was attached to. The valve is called a transmission modulator. The diaphragm is rupture and aloowing engine vacuum to **** and burn the fluid. your trans should be needing fluid too often. Modulator around 12.00 last known.
  • Manual transmission ? - PCVvalve not bafflrd against drawing oil from its location in valve cover.and or Pcv valve is defective. Cheap fix-replace

Posted on May 09, 2009

Testimonial: "that was very helpful. it was the pcv valve that was letting oil into the intake manifold hence the smoking. thanks. Gerald."

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