Question about 1990 Nissan Pathfinder

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Car came to stop choking and low voltage

1st - I live in Costa Rica - not a hotbed of parts and mechanics - that being said - car was going along nicely at 55mi/hr when it began to miss- choke loose speed - amp light on and then quit. I suspected bad gas - 27 mi since fill us - we have changed fuel filter - didn't help - sounds like its only hitting on about 2 cylinders - now at mechanic - he has a pathfinder - he says the computer is bad? What do you think? He says the computer will be $700 plus labor--I'm wondering about sensors - fouled fuel injectors - any other than computer - if he plugged this in for diagnostic would it show computer??

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  • mike watson
    mike watson May 11, 2010

    I would try giving it spark plugs'and wires first.does it have a distributor cap and rotor also?Some have just a coil pack system with no cap or rotor.

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  • Nissan Master
  • 2,019 Answers

Not likely the computer because that would be equally bad on all cylinders.

When you took the filter out, you should have tapped the input side on the ground, looking to see if water came out. You could still easily have water problems, because water is a lot stickier than gas, and causes all sort of problems.

I would suggest pulling the injectors out, withhout disconnecting the fuel. Then watch then squirt. Check volumn and spray pattern. Compare.

If you don't want to pull them, you could just try running it on spray starting fluid for 10 seconds or so, to see if it improves and is a fuel problem.

If not, then it is an electrical problem.
Check the spark at each plug wire, with a spare sparkplug grounded. Should be a good color and sound. Again, compare.
If the spark is bad, then you still have lots of options, but get back to me and I will say more.

If the spark is not bad, then pull the plugs.
Look to see if wet with gas, water, or fouled with carbon.
If the fuel injection stuck open, you could quickly fouled out the plugs with carbon.

But you could have also blown a head gasket or cracked an intake manifold.
I need to know the obvious before I can get into more detail.
For example, if you developed a manifold leak, I would suggest checking with a vacuum guage or listening with a hose.

At $700, I would consider just switching to a carb conversion.
http://www.recarb.com.au/Nissan%20Pathfinder%20Z24%20CK.php
Fuel injection gets better mileage, but carbs are more fun.

Posted on Feb 03, 2010

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Posted on Jan 02, 2017

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