1HZ Run On

Flesh,
No the oil level hasn't increased and when it does run on it does it at a smooth idle so I'm pretty sure its not fuel leaking into the sump. Thanks for the tip but I think Ray might be on to it. Yes the beer budget is fairly big but not "toyota spare parts" big!!
Cheers,
Hughesy

Ray,
Sounds pretty good mate so I might give it a try. Its only a 97 model but it has done 235000km. Fingers crossed that its only that simple.
Cheers,
Hughesy

Thanks desert, will try that as well. I did the timing belt again at 200000km but hadn't heard about changing the idler pulley, might keep that in mind if the beer budget goes into surplus (not likely).
Cheers,
Hughesy

check your alternator circuit voltage return from alt light can cause this problem as the alternator supplys power to the ign on the other side of the switch. a diode in the alt. light wire wil fix/check for elect radiator fans as well, if these are wired to work with key on they will feed reverse currant as well as eng fan will keep them spinning making them a generator. have seen aicon clutches wrecked by this many times .so these fan motors do generate sufficient power.also check for anyother elect. device that you might have on vehicle wired to key that might give same problem when eng. runs on try turn on wipers and flickers etc to draw currant from this saurce if the eng, stops then feed back is the problem. had a friend that fitted a 2.4 hilux diesel to axy falcon ute with holden bosch alternator . he had run on problems caused by feed back from alternator via the light/excter circuit heused to put gear lever into reverse to stop eng.ie starved the circuit from power a diode would fix this in his case.

regards dmech