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Bought car with old or stale fuel, drained and changed filter, added seafoam and ran vehicle. After awhile car began to loose power under load like a misfire. Changed plugs, cap, rotor, wires. The shop stated main Cat was plugged (300 deg in 74 out). Removed cat and put on test pipe. Still some lost of power and hesitation at take off and when flooring while driving. Added 6 new Bosch injectors and seals and it increased a little. Is there anything else that could cause this power loss under load (i.e coil)? Oh the oxygen sensor is just tied under car until I replace the cat (would that throw off my mixture enough). What about the 2 pre-cats connected to the exhaust manifold could they be plugged? Maybe they plugged before the main cat did!

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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: 5vz-fe misfire codes

Replace the coil pack.

Posted on Dec 26, 2008

  • 1861 Answers

SOURCE: the 4runner is throwing 3

Replace the coil pack..

Posted on Dec 26, 2008

  • 1 Answer

SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

  • 1940 Answers

SOURCE: Engine began to miss after

  1. Have your timing belt checked and replaced. Sounds like it may have jumped, or is stretched.
  2. If after repairing any timing issues you are still facing this problem, it may be time to have the fuel injectors tested and the fuel pump tested and replace as necessary.

Posted on Feb 13, 2011

SOURCE: 98 Chevrolet Silverado runs rough at half throttle and past.

try removing the EGR valve and clean inside of it and manifold

Posted on Feb 17, 2011

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