1997 Nissan Pathfinder Lacks Power

1997 NISSAN PATHFINDER
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LAMS33
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  • 1 POST
I have a Nissan Pathfinder 1997, 2X4, six cylinders, 76,000 miles. A couple of months ago I noticed that the engine lacked power on both flat roads and hills.

I went to a car computer technician and they installed a new ignition...however it did not solve the problem.

The same technician tested the car with a new flow meter sensor and the new ignition...once again it did not solve the problem.

Another technician examined the monolithycs... they are clean and OK.

Can you tell me what can be wrong with this scenario? Any ideas?
Jan 16, 2007 at 12:55 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Have the fuel pressure check -this will ID a problem with the filter,pressure regulator, and pump.

The Cat did they remove it and visually check it or its an assumption.

I would recommend a backpressure check on the exhaust system.
Jan 16, 2007 at 12:56 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Sounds crazy-but try the knock sensor-might be retarding the ignitiion timing by sensing detonation/spark knock
Jan 19, 2007 at 6:06 PM
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Suggested Repair

Check fuel pressure to evaluate the fuel filter, pressure regulator, and pump. Confirm the catalytic converter with an exhaust backpressure test rather than assuming it is clear. Also test the knock sensor, which can retard ignition timing if it falsely detects knock.

Conversation Summary

The owner of a 1997 Nissan Pathfinder reports a lack of power on both flat roads and hills. Replacing the ignition and testing a flow meter sensor did not fix it, and the catalytic converters were reported clean. Experts recommend checking fuel pressure, performing an exhaust backpressure test, and testing the knock sensor for false knock that retards timing.

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