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My truck has a misfire, loses power going up.

Tiny
SNOMAN3389
  • MEMBER
  • 1993 NISSAN HARDBODY
  • 147,000 MILES
My truck has a misfire, loses power going up hill and bogs down to almost shuts off when I push the accelerator to the floor. I have changed the mass air flow sensor, O2 sensor, spark plugs and wires. I don't know what else it could be.
Sunday, March 31st, 2013 AT 9:24 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the throttle position sensor closed and wide open throttle voltages and also the exhaust system for restriction
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Sunday, March 31st, 2013 AT 9:27 PM
Tiny
SNOMAN3389
  • MEMBER
  • 2 POSTS
I changed the throttle position sensor today and the exhause is clear except for a leak at a flange. Nothing changed, except I noticed that my air intake box where my air filter is has a high pitch whistling sound when the engine is revved. I'm at a loss.
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Tuesday, April 2nd, 2013 AT 12:47 AM

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