Question about 2007 Mazda B4000

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Engine surges not responsive to WOT

I have a 1994 b4000 4wd manual trans. Just bought it as my commuter. Problem I'm having is that when I press the throttle WOT engine is not responsive and when moving the engine surges slightly. It does respond to part throtle opening can not pass hign idle test on scanner getting code 538 and 412. Just did plugs, wires, oil, filters, egr operating, and test out of tps is ok? Can someone help me this is my first mazda/ford v-6.

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  • td_electric May 26, 2009

    I will order one and try it.

  • td_electric May 27, 2009

    replaced TPS engine is still sloww to respond to WOT condition. KOER test still giving codes 412 and 538.......could the fuel pressure regulator or coil pack be the issue? I can't find anyone with the repair manual in stock around here.....

  • td_electric Jun 07, 2009

    Well found out that there was a vacuum leak at the plenum to injector rail, the IAC solendoid was hanging up, and the IACT sensor was failing. Replaced listed parts and found the engine now pings like a champ and stills has lack of WOT response found out the lower intake manifold has a coolant and vacuum leak and the injectors are all failing (high injector pulse and over 16.5 ohms each) code 186 now occurs while driving....gotta love it...time to order more parts

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SOUNDS LIKE THE T.P.S. IS NOT FUNCTIONING. ALTHOUGH IT MAY TEST OK, IF IT IS NOT RESPONDING, THEN IT MUST BE REPLACED. UNLESS YOU HAVE A FUSE FOR THE TPS, THEN IT MUST BE THE ONLY REASON FOR NO THROTTLE RESPONSE. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR USING FIX-YA. AND FOR AN HONEST RATING IN ADVANCE. GOOD LUCK.

Posted on May 26, 2009

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