Sandman6 New Member 10 Member For: 12y 4m 8d Posted 01/04/14 01:05 AM Share Posted 01/04/14 01:05 AM Hi all, I just my car back after my second ZF catastrophe. The car is surging under part throttle, by surging I mean the revs are rising and dropping a few hundred rpm as I accelerate off boost. Even with cruise control its quite pronounced. I have an engine light for an O2 sensor which I have replaced as well as the o2 loom to no avail.I have sprayed Conyact cleaner through the plenum and reflashed the ecu and even rewored my throttle body.The car has a new stage 2 BTA ZF box and heavy duty std lockup torque converter.running a process west plenum,kit. Please help, anybody had this issue?also I might add that on full bost the car runs 100% but runs super rich when I let off. To the pointbwhere I can see the black fuel smoke while im at the lights Link to comment https://www.fordxr6turbo.com/forum/topic/87881-bf-xr6turbo-revs-surging-under-part-throttle/ Share on other sites More sharing options...
Chaos310 Donating Members 228 Member For: 12y 8m Gender: Male Posted 10/04/14 02:21 PM Share Posted 10/04/14 02:21 PM possibly dropped a cam chain guide and jumped a tooth on the crank sprocket... putting you out half a tooth at the cams...check your cam timing...let me know.cheers Link to comment https://www.fordxr6turbo.com/forum/topic/87881-bf-xr6turbo-revs-surging-under-part-throttle/#findComment-1464836 Share on other sites More sharing options...
Kosij Donating Members 2,045 Member For: 13y 8m 21d Gender: Male Posted 10/04/14 10:06 PM Share Posted 10/04/14 10:06 PM Possibly a dodgy box from a dodgy workshop with a dodgy tune. 1 Link to comment https://www.fordxr6turbo.com/forum/topic/87881-bf-xr6turbo-revs-surging-under-part-throttle/#findComment-1464860 Share on other sites More sharing options...
TomT Spooling Member Donating Members 961 Member For: 13y 4m 25d Gender: Male Location: Blue Mountains, NSW Posted 11/04/14 01:07 AM Share Posted 11/04/14 01:07 AM +1 with KosijRev hunting is a possible symptom of ZF milkshake if you don't have an external trans cooler.I'd check you coolant overflow tank for colour and substance Link to comment https://www.fordxr6turbo.com/forum/topic/87881-bf-xr6turbo-revs-surging-under-part-throttle/#findComment-1464897 Share on other sites More sharing options...
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