98 3.9 misfire after running out of gas

Wild willie · Oct 4, 2017

OK so just bought the truck and listen to it run for about 15 mind ran fine. After dude left I tried to move it and it was out of gas. Then put gas in it and now misfires. I'm guessing injector sucked up some trash. What do y'all think?

dudeman2009 · Oct 4, 2017

The fuel pump ran out of anti-sieze. It may be partially cooked. You'll need to run a fuel pressure test first while its misfiring, that will give you a direction to go in.

Wild willie · Oct 5, 2017

The fuel pressure is at 45 psi

Wild willie · Oct 5, 2017

It might be a firing problem, exhaust seems to have a heavy gas smell

Wahrsuul · Oct 6, 2017

Don't think running out of gas had anything to do with it. I had an '01 dakota with the 3.9 for 7-8 years and 0ver 180K miles. Seems every couple years I had to replace plugs and wires or I'd get misfire codes. Maybe if I'd bought the 8mm performance wires it might have lasted longer, but usually just bought the Auto Zone/Car Quest brand. Went with iridium plugs once, but they didn't do any better than the Autolite copper.

Wild willie · Oct 6, 2017

There is no codes but next step is going to be changing plugs and wires

dudeman2009 · Oct 6, 2017

If the pressure is good then its unlikely the fuel pump. As Wahrsul has mentioned don't let then talk you into anything but the stock heat range copper plugs, go with any brand you want in the copper heat range (some people have problems with Autolite others say they work great)

Wild willie · Oct 7, 2017

Well plugs and wires didn't solve anything what should my next step be

Yeret · Oct 7, 2017

What did the old plugs look like? Does the engine use oil? Starting to sound like another case of a blown plenum gasket. I'm willing to wager a blown plenum was the root of Wahrsuul's problems.

Also, what did you use for spark plugs? Our ignition systems really don't like platinum or iridium plugs and there are plenty of reports of misfiring problems while using them. Use plain ole copper or nothing at all.

98 3.9 misfire after running out of gas

Wild willie

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dudeman2009

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Wild willie

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Wild willie

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Wahrsuul

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Wild willie

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dudeman2009

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Wild willie

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Yeret

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