Question about 1999 Infiniti.5 QX4

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My 99 qx4 hesitates when idle and accelerating...often dies when idle but starts right back up again no problem.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 87 Supra idles rough and dies out

I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.

Posted on Jan 28, 2009

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SOURCE: 2004 nissan armada low idle then won't start

I had the smae problem with mine last week, it turned out to be the IPDM Independent power distribution moduel, looks like a big fuse box. I would take it to a side mechanic and have them fix it instead of going to the dealer it took like 45 mins to take the old one out and put the new one in. If you go to the dealer they are sure to charge something crazy. Hope that works for you.

Posted on Feb 25, 2009

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

I had the same problem with my Z when i had it. But it worked when i just left the little hose off of the EGR valve.

Posted on Jun 13, 2009

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SOURCE: 3 symptoms in random! one Car ! 2000 Impala 3800

First thing I'd check is fuel pressure. 55psi

Posted on Dec 13, 2009

  • 5 Answers

SOURCE: My Mazda mx3 starts up idles for a couple seconds then dies.

Before you replace the fuel pump, I would check the cheaiper parts first. Such as fuel filter and injectors.

Posted on Feb 14, 2010

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