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Posted

Hi I have a auto 99 4 cyl that can't maintain a constant rpm. e.g. coasting then accelerate to desired rpm and it will suddenly drop by 200-400 rpm with a low to moderate load, labouring the motor slightly. It drives great for 230k kms (cambelt done at 206) and after doing the usual service oil,fuel/air filter,plugs and leads,ATF/diff oil recently I'm all out of ideas.

Posted

Does it do it in all gears at all speeds or just particular ones?

Could be the torque converter locking and unlocking

Posted

I do a lot of country driving and it only happens in top gear (70-90km/h) and gets worse depending on the incline. Its like I have to give it more throttle then it needs so it wont drop a few hundred revs. I'm sure it's been there as long as I've owned it but is annoying me a lot lately.

I occasionally get a CEL camshaft posistion sensor code, it might stay off for a week or two, flick on and off for another week but the car hasn't missed a beat at all so I havent worried about it except clearing the code.


Posted

sounds like the torque converter is locking at the wrong time

Posted

Thanks for the answers everyone I have found a few threads describing my problem after searching torque converter

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