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Idle sits at 500rpm/shudders and cuts off - 1993 Nissan Pickup

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  • frank santoli
    frank santoli Mar 18, 2014

    i justgot my 1993 nissan fuel injectors clean,thrortle position sensor gasket,egr ports cleaned and mass flow sensor cleaned and it runs great.my mechanic had same truck but yours ounds like could be vacumm line broken..i also had one broken

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Vehicle shudders and sometimes dies. It shudders


Check the EGR Valve for stuck open condition with a vacuum pump.

If at idle you apply vacuum and it gets worse and shuts down or shutters, then that's not the problem. But, if you apply vacuum and there is a leak, there is a bad EGR valve on the car. If you apply vacuum and it operates the EGR and there is no change then the EGR should still be removed and the pintle cleaned, or a new EGR Valve should be installed.

Also, a coil pack could be causing this condition, where not enough spark gets to the spark plugs.

Is this a 4 tech or quad 4 engine?

Also, the cylinder head gasket could be burned through and allowing one cylinder to bleed exhaust to another cylinder on the Quad 4.

Good luck with this.

Jul 13, 2010 | 1991 Buick Skylark

1 Answer

I hav 96 toyota cavalier auto,it shuddered and


I don't know if it would cause the shaking and vibrations, but for the smoke it could be loose nuts or broken studs on the exhaust manifold -- when engine is cold check each of the nuts (there should be 8) to see if they are loose or missing/broken; you may have to remove a heat-shield in order to gain access

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Will Not idle when sitting up hill.


If the car is facing up hill at an idle, it may be that the fuel pump is located on the front of the fuel tank.

I would suggest either trying to park the car facing downhill, or having a full tank of gas when parking the car.

Thank you for your question, and please let me know if there's anything else I can help with.

-Mike

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i had this happen to me the cause for me was that the shafts on the ends of my spark plug cables were cracked i hope this helps

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650 idle speed .you can back it off just a hair.

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2 Answers

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SOUNDS LIKE THE FUEL INJECTORS ARE BAD WHICH UNFORTUNATELY ARE EXPENSIVE. YOU COULD POSSIBLY GET SOME USED INJECTORS FROM A JUNK YARD FOR CHEAPER.

Oct 17, 2008 | 1995 Nissan Maxima

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