Billy Boy New Member 3 Member For: 10y 6m 2d Posted 12/01/15 09:29 AM Share Posted 12/01/15 09:29 AM (edited) Hi,I own a BA 2004 XR6 Turbo sedan (automatic).What I have noticed recently is when I start to accelerate extremely quickly (ie kick down on accelerator), say from stand still or just cruising along at 40 km/hr, when car reaches around 85 km/hr at about 4,000 RPM to 4,500 RPM, the engine starts to run very rough and I can't continue with the acceleration to go beyond 100 km/hr. I can continue driving, however, engine runs very roughly and then have to switch off engine to clear the rough effect from engine. After switching engine off and turning back on, engine runs normal and smooth.If I avoid these kind of kickdowns, I can easily achieve higher speeds (eg 120km/hr and above) and engine runs smoothly.Can anyone suggest what could be at fault during 'kickdown' and what I should do?Cheers,Bill. Edited 12/01/15 09:30 AM by Billy Boy Link to comment https://www.fordxr6turbo.com/forum/topic/89911-ba-xr6-turbo-engine-runs-rough-at-kickdown/ Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 9m 21d Gender: Male Location: Perth Posted 12/01/15 10:10 AM Share Posted 12/01/15 10:10 AM Probably valve springs. Link to comment https://www.fordxr6turbo.com/forum/topic/89911-ba-xr6-turbo-engine-runs-rough-at-kickdown/#findComment-1523050 Share on other sites More sharing options...
FPV TRANNY Im the one and only Donating Members 3,557 Member For: 20y 6m 7d Gender: Male Location: In my house Posted 12/01/15 05:22 PM Share Posted 12/01/15 05:22 PM Valve springs, coil packs or TPS Link to comment https://www.fordxr6turbo.com/forum/topic/89911-ba-xr6-turbo-engine-runs-rough-at-kickdown/#findComment-1523411 Share on other sites More sharing options...
Billy Boy New Member 3 Member For: 10y 6m 2d Posted 13/01/15 11:20 AM Author Share Posted 13/01/15 11:20 AM Thank you all for your feedback.Would a diagnostic test, say connecting a car's ECU to a diagnostic computer determine exactly what the problem maybe? Link to comment https://www.fordxr6turbo.com/forum/topic/89911-ba-xr6-turbo-engine-runs-rough-at-kickdown/#findComment-1523606 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 9m 21d Gender: Male Location: Perth Posted 13/01/15 12:13 PM Share Posted 13/01/15 12:13 PM It will assist in diagnosis it. As Pixy mentioned it may (alot of things...) Coils or the TPS so the diagnostic system will flag this. 1 Link to comment https://www.fordxr6turbo.com/forum/topic/89911-ba-xr6-turbo-engine-runs-rough-at-kickdown/#findComment-1523620 Share on other sites More sharing options...
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