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Location:
Townsville, NQ
Registered:
May 2005
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3VZ-FE misfire
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Sun, 08 May 2005 13:40
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My fathers vienta has had a misfire problem for ages now, and no one has had any luck fixing the problem. Sometimes when something is changed it will temporarily cure the problem, but it always comes back. The misfireis totally intermittent and certainly not just one cylinder. Sometime it will be fine for a whole drive, others it will miss on and off the whole way. It's currently bad enough that it's almost undriveable. Spark plugs, leads, dizzy cap and rotor have all been changed.
It was at the local toyota dealer last week; they swapped the ecu between it and another vienta. Each ran fine with the others ecu, so they swapped them back, still ran fine. They test drove it for 30min, fine. I took it home, had to overtake, 80-130 foot to the floor, ran fine for the next few min, then has missed very badly since.
Any ideas? Anyone have a wiring diagram?
Where does the tacho get its signal from, the ECU or at the coil/igniter? That might be a bit of a clue seeing as the tacho does drop when it's missing.
Any help on this is greatly appreciated.
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