timburns23 New Member 7 Member For: 10y 1d Posted 12/12/15 09:24 AM Share Posted 12/12/15 09:24 AM Hi guys Hoping someone might be able to give me an idea where to start with this... 2003 BA XR6 Turbo, 125000KM. I am the second owner since I got it at 120000KM where it was in stock standard form around 8 months ago. A week after owning it I took it to HorsePower Factory and got a basic custom dyno tune, cold air intake, with the factory fuel injectors and valve springs left alone. All was well for 3000KM and then the gearbox started slipping, so I had the BTR 4 speed rebuilt to OEM spec less than 2000KM ago. When I got it back the car was going great, feeling a lot of responsive and agressive. A few weeks later, it started missing at idle so I swapped the coil packs and spark plugs for new genuine Ford ones. Since then, it idles perfectly, but I now get a loud backfire at wide open throttle when shifting into 2nd. And just now tonight I noticed it is missfiring fairly badly around 50% of the time when WOT from 80kph... sometimes its a short missfire and it clears and keeps pulling hard, othertimes its spluttering really badly so I back off the throttle. Tonight was the first time I had tried WOT from 80KPH since doing the plugs/coils a month ago. Aside from that, it drives great as my daily driver, and sits on 110kph towing my dirtbike trailer no worries. I have checked all the air intake hoses and everything is still in place since I did the plugs and coils. I am wondering if it is something to do with the spark plug gap? In my receipt from HPF it shows "re-gap spark plugs as required"... so perhaps these new OEM ones aren't fitting the tune? Or perhaps I have a faulty coil pack, which would be bad luck as they are brand new. Unfortunately I threw out the old coil packs and plugs. Is it common to modify the spark plug gap when tuning these? Should I just ask HPF to re-gap some new plugs for me? Thanks in advance for any ideas you have, love driving this car and looking forward to sorting this out. Cheers,Tim Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/ Share on other sites More sharing options...
masda74 To Loud Gold Donating Members 4,112 Member For: 13y 6m 1d Gender: Male Location: WA, Perth Posted 12/12/15 11:18 AM Share Posted 12/12/15 11:18 AM Please take this with a grain of salt, I am no expert, but I think this may be the valve springs mate.Can Luke please tune in and advise? Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573565 Share on other sites More sharing options...
Wilko16 Donating Members 1,672 Member For: 17y 6m 10d Gender: Male Location: Melbourne Posted 12/12/15 01:16 PM Share Posted 12/12/15 01:16 PM If your boost is higher than standard you need to gap your plugs down .7 or .8 gap should be good Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573568 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 8m 8d Gender: Male Location: Perth Posted 12/12/15 01:34 PM Share Posted 12/12/15 01:34 PM On 12/12/2015 at 1:16 PM, Wilko16 said: If your boost is higher than standard you need to gap your plugs down.7 or .8 gap should be good^WHS Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573569 Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 7m 4d Gender: Male Location: Perth Posted 12/12/15 01:45 PM Share Posted 12/12/15 01:45 PM As others have said. It's more than likely plug gap. What ones did you install Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573570 Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 6m 11d Gender: Male Location: Brisbane Posted 13/12/15 01:47 AM Share Posted 13/12/15 01:47 AM OR its a tuned BA with 125 000km and stock valve springs. .. Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573612 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 8m 8d Gender: Male Location: Perth Posted 14/12/15 03:51 AM Share Posted 14/12/15 03:51 AM On 12/12/2015 at 9:24 AM, timburns23 said: A few weeks later, it started missing at idle so I swapped the coil packs and spark plugs for new genuine Ford ones. Since then, it idles perfectly, but I now get a loud backfire at wide open throttle when shifting into 2nd. And just now tonight I noticed it is missfiring fairly badly around 50% of the time when WOT from 80kph... sometimes its a short missfire and it clears and keeps pulling hard, othertimes its spluttering really badly so I back off the throttle. Tonight was the first time I had tried WOT from 80KPH since doing the plugs/coils a month ago. Cheers,TimYeah sounds like valve springs /end italicsAlso cheers and Tim in the one post, how did we miss that? 1 Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573723 Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 17y Gender: Male Location: Adelaide Posted 14/12/15 03:58 AM Share Posted 14/12/15 03:58 AM GOTIM Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573724 Share on other sites More sharing options...
masda74 To Loud Gold Donating Members 4,112 Member For: 13y 6m 1d Gender: Male Location: WA, Perth Posted 14/12/15 04:42 AM Share Posted 14/12/15 04:42 AM Luke, that is why I thought it was valve springs, due to that line in Italic.It's gonna be a pain in the ass to get done, may as well upgrade a few other parts, if you got plans to upgrade and get the valve springs done to. Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573728 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,332 Member For: 19y 8m 8d Gender: Male Location: Perth Posted 14/12/15 04:45 AM Share Posted 14/12/15 04:45 AM OP changed plugs and Coils. Problem started. Regapping the plugs to the correct range is the place to start. 1 Link to comment https://www.fordxr6turbo.com/forum/topic/91479-ba-xr6-turbo-missfiring-under-wot-with-new-coils-and-plugs/#findComment-1573729 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now