baf6 Member 139 Member For: 16y 22d Posted 07/05/11 02:26 AM Share Posted 07/05/11 02:26 AM (edited) Hi guys, im having a problem that happens on occasions, when im givin the F6 a bit of stick and back off the engine runs rough and loses power, usually just back of for a bit and it comes good, mostly happens in 4th or 5th gear.whats the most likely cause of this, valve springs, coil packs? any other ideas?I've done a bit of searching and thinking valve springs, if it is the case, what are the best value valve springs, noticed theres quite a range. Brad. Edited 07/05/11 02:27 AM by baf6 Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/ Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 14y 3m 21d Posted 07/05/11 02:47 AM Share Posted 07/05/11 02:47 AM How long is it rough for? If u try and slowly accel while it's rough, what happens? Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1103670 Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 11m 24d Gender: Male Location: adelaide hills- 'race air' central Posted 07/05/11 05:43 AM Share Posted 07/05/11 05:43 AM valve springs will do that on hi revs. a sedan with no surge tank will do that if fuel level is under 1/2 tank. old plugs will do that under load. Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1103709 Share on other sites More sharing options...
baf6 Member 139 Member For: 16y 22d Posted 07/05/11 07:45 AM Author Share Posted 07/05/11 07:45 AM its rough untill I back right off and slow down, if I accell slowly it runs rough like it's not running on all cylinders.Its a ute but I do get fuel surge under 1/4 tank, plugs were replaced recently by tuner Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1103755 Share on other sites More sharing options...
Kroozin Menace Donating Members 1,990 Member For: 14y 19d Gender: Male Location: Sydney Posted 09/05/11 12:04 PM Share Posted 09/05/11 12:04 PM mine does the same.. I'm led to believe it is the valve springs and they need to be replaced with aftermarket springs I think some guys are using crow cams springs,etc..$$$ . What is the worst case scenario if encountering valve float here and there after a big rev like baf6 has said? Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1104481 Share on other sites More sharing options...
baf6 Member 139 Member For: 16y 22d Posted 10/05/11 08:45 AM Author Share Posted 10/05/11 08:45 AM (edited) rapid have springs for $279, think I'll get them and see how I goretune too, might see the power I should be, with a lil luck Edited 10/05/11 08:58 AM by baf6 Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1104715 Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 11m 13d Gender: Male Location: @ my laptop Posted 10/05/11 09:25 AM Share Posted 10/05/11 09:25 AM . What is the worst case scenario if encountering valve float here and there after a big rev like baf6 has said?dropping a valve into the cylinder and smashing the piston, block and cylinder head Link to comment https://www.fordxr6turbo.com/forum/topic/74708-engine-running-rough-hi-rpm/#findComment-1104735 Share on other sites More sharing options...
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