Question about 1999 Infiniti.5 QX4
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Posted on Jan 02, 2017
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
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
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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