timburns23 New Member 7 Member For: 9y 6m 11d 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 Share on other sites More sharing options...
masda74 To Loud Gold Donating Members 4,112 Member For: 13y 10d 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 Share on other sites More sharing options...
Wilko16 Donating Members 1,672 Member For: 17y 20d 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 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 18d Gender: Male Location: Perth Posted 12/12/15 01:34 PM Share Posted 12/12/15 01:34 PM 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 Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 1m 14d 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 Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 21d 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 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 18d Gender: Male Location: Perth Posted 14/12/15 03:51 AM Share Posted 14/12/15 03:51 AM 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 Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 6m 10d Gender: Male Location: Adelaide Posted 14/12/15 03:58 AM Share Posted 14/12/15 03:58 AM GOTIM Link to comment Share on other sites More sharing options...
masda74 To Loud Gold Donating Members 4,112 Member For: 13y 10d 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 Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 18d 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 Share on other sites More sharing options...
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