1992 Mazda B2600 lack of power poor running

Tiny
2CARPROS-ARCHIVES
  • 1992 MAZDA B2600
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 93,000 MILES

1992 Mazda B2600I 4 cylinder, fuel injected, mileage: 93,000. My truck has been well maintained. My problem started about two months ago and I have not been able to resolve it. The problem is that occasionally the engine decides to oscillate rpms when placed in gear (it is a manual transmission), and on some occasions it takes numerous start attempts to get the engine to run on its own and I have to let it warm up for fifteen minutes before being able to drive it. Once running it will vary in power when downshifting, while coming to a stop it will suddenly lurch forward. This problem is not a constant thing it just comes and goes. There is no common time of occurrence, such as only when the engine is cold or only hot etc. I have had a mechanic put the engine on an analyzer and it did not reveal any problems. I replaced the plugs, wires, fuel filter, catalytic converter, and have added slick 50-fuel treatment along with running only 93-octane gas, none of this has solved the problem. I am stumped please help with some advice. Thanks.

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Wednesday, December 1st, 2010 AT 6:51 PM

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Tiny
2CARPROS-ARCHIVES
  • MEMBER

From what you have described, we believe that your problem is a faulty oxygen sensor.

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Wednesday, December 1st, 2010 AT 7:00 PM

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