Noka Member 13 Member For: 14y 17d Gender: Male Location: Geelong Posted 31/05/13 10:19 AM Share Posted 31/05/13 10:19 AM My BF (06) XR6T ute has been playing up on cruise control. It is a 6 speed auto box with 110000km's.I have found when cruise control is on, or when driving without cruise control but when engine under load (going up a slight hill), the revs bounce up and down between 1500 & 1700 rpm and sounds like the car is surging. Was also getting the same shudder that a manual car gets when in a gear too high and going to slow.I took it to the transmission place to get a service and when dropped the pan basically the oil was water. Found the heat exchanger had sh*t itself and contaminated the oil with coolant. Basically rebuilt the auto (converter, clutch, plates etc...).The reco has fixed the shuddering problem but the surging still exists. I have today replaced the throttle position sensor and still have the same problem. Does anyone know what may be causing this.Over the last couple years I have been getting my ETC light come on and off randomly on the dash hence why I changed the TPS. The transmission guys have also managed to data log the ecu when driving and picked up the codes relating to the pedal position sensor, P2127, P2129, P2138 & P2140.Will this somehow effect the yo yoing of the rpm when the engine is under slight load (going up a hill with cruise on or off)?Thanks for any input! Link to comment Share on other sites More sharing options...
MiKa Donating Members 4,243 Member For: 18y 5m 6d Gender: Male Location: Melbourne, VIC Posted 31/05/13 12:04 PM Share Posted 31/05/13 12:04 PM My car does the same... going up hill on cruise, it'll obviously try and maintain the speed, but it accelerates too much and then drops back again, then it senses its slowing down again so accelerates again and then drops again... Its asif it cant figure out a happy medium.. This is even on only slight hills too... I kinda only noticed it once I put some new parts on (bigger cooler pipes, cooler etc...) hasnt been tuned yet, but had it on the dyno and all is good.. Im thinking its tune related, well for me anyway.. Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 2d Gender: Male Location: Brisbane Posted 31/05/13 10:53 PM Share Posted 31/05/13 10:53 PM I don't think the ZF can be rebuilt properly after a 'milkshake' which is probably why you're still having issues, when it's a warranty job they just replace the whole lot as it causes permanent damage to the mechatronics module.If you want to read more see... http://www.fordxr6turbo.com/forum/topic/75623-zf-auto-milkshake/But that's mostly hysteria and not much fact unfortunately. Link to comment Share on other sites More sharing options...
Noka Member 13 Member For: 14y 17d Gender: Male Location: Geelong Posted 02/06/13 12:32 AM Author Share Posted 02/06/13 12:32 AM Mine has been tuned for a couple years now and not one problem. It has just started the past couple weeks and can not figure it out. I'm thinking it might be the motor on the throttle body might be a little sticky. I will be checking the pedal position sensors too. Maybe clean them with some contact cleaner and see if this helps. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 3d Gender: Male Location: Perth Posted 02/06/13 12:33 AM Share Posted 02/06/13 12:33 AM Changed any tires lately? Link to comment Share on other sites More sharing options...
Noka Member 13 Member For: 14y 17d Gender: Male Location: Geelong Posted 02/06/13 12:35 AM Author Share Posted 02/06/13 12:35 AM no tyres have been changed. although I did get a wheel alignment and they said to keep the tyres at 40psi just before this started..... Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 3d Gender: Male Location: Perth Posted 02/06/13 01:28 AM Share Posted 02/06/13 01:28 AM same size tyres front and rear? Link to comment Share on other sites More sharing options...
Noka Member 13 Member For: 14y 17d Gender: Male Location: Geelong Posted 02/06/13 06:13 AM Author Share Posted 02/06/13 06:13 AM 20's all around just wider on the rear. Had them for a couple years and no problems until now Link to comment Share on other sites More sharing options...
gsd112 Donating Members 604 Member For: 14y 4m 22d Gender: Male Location: Penrith Posted 02/06/13 06:41 AM Share Posted 02/06/13 06:41 AM Check to see if they replaced the mechatronics module after the milkshake. Link to comment Share on other sites More sharing options...
_Velocity_ Bronze Donating Members 2,768 Member For: 13y 9m 1d Gender: Male Location: Victoria Posted 02/06/13 06:44 AM Share Posted 02/06/13 06:44 AM Fit an external transmission cooler. It won't solve your surging but it'll save your ZF from milk shaking again. Link to comment Share on other sites More sharing options...
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