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1999 Nissan Pathfinder

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Nov 13, 2014, 4:21 AM

Post #1 of 2 (970 views)
1999 Nissan Pathfinder Sign In

G ' day from Australia..

Hi, I have a 1999 -2000 Nissan Pathfinder (Auto), there is a major issue with it, but I cannot seem to be able to locate the problem. It bucks, jerks, coughs and splatters. I have run a diagnostic machine on it and it's reading "0 faults".
I have replaced all 6 spat plugs, the leads are fine. I have also replaced the air filter and fuel filter. I have bought a fuel pump hoping that is the issue :( .

The revs bounce up and down from 500 rpm to 0 (stalling), then from 500 - 1000 (jerking / bucking) in neutral if the car starts and I hold my foot to the ground the revs do not go past 5000rpm.

The engine has 314 xx xx. Motor oil is fine, trans fluid is ok, oh, and when i do rev it, I have black liquid coming from the exhaust and a strong smell of fuel, almost like a lawn mower,..... what could it be?

Does anyone have an idea on what the issue might be?

Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 13, 2014, 5:24 AM

Post #2 of 2 (950 views)
Re: 1999 Nissan Pathfinder Sign In

G'Day (evening) back at you.

Some questions and suggestions for now:
Do you NOT know what model year this is?
Could matter but 314,xxxx what miles or kilometers? Either is up there IMO and open to plain engine wear out more if you meant miles.

Not getting a code and running like that is a fault with how you are reading it, your device or the connection to the vehicle. There has to be helpful codes.

What might have brought this on especially if sudden?
What did OLD spark plugs look like - all the same of a few different conditions?
How do you KNOW spark plug "leads" are good, we call them plug wires for short.
OK - seeing junk out the tail pipe black and fuel odor in abundance is a terrible sign of troubles. That would be incredibly hard on sensors from oxygen sensors to the catalytic converter(s) probably rendering them not effective at all for now.

Tons of sensors are telling the engine how much fuel to deliver exactly, at what time and ignition timing plus when to shift would be all confused about now.

Better code readings would really help. You may need a compression test and check for fuel wash which might show as fuel odor in engine oil or too full or both.

Basics always count too. Vacuum leaks in hoses and gaskets to intake manifold anywhere. A sensor or more plain left unplugged for throttle position, engine temperature and more too.

A clean throttle body with all the parts in decent shape not allowing bypassing air filter or any of it. If this is getting unmetered air into intake it will screw up the show.

Now, at the mileage you just need to know the general wear condition as mentioned and can check for the compression both wet and dry and valve timing comes into the picture as well.

You need to begin somewhere "mate" so get going.

Mostly US techs here but this vehicle should be real close to ones sold to N. America (US and Canada) except the dang steering wheel is on the WRONG side by US arrogance it's YOUR fault for that - smile,


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