andyturbo Member 500 Member For: 20y 10m Gender: Male Posted 28/04/10 03:30 PM Share Posted 28/04/10 03:30 PM (edited) Gday AllHavn't been on the forums for a while hope everyones well. I have an issue that I hope someone can help me with. My car is a BA mk1 xr6t auto. The problem is, its currently runing a 10psi Generic cappa tune from the old cappa flash box (I know they are sh*t but I cant afford a custom tune atm). All was fine for a while, but all off a sudden it is only boosting to 7-9psi (usually 7psi in first and jumps to around 9 after 1-2 gear change) but more, worrying, shes backing firing. Best way to describe it is exactly like traction control kicking in but when its off and on full throttle. The car stutters and jerks. I have triple checked all piping is on correctly (for a boost leak) and when the car is flashed back to standard tune, it boosts too 5-6 as it should and does not back fire at all. Only other mods is air intake (currently runing a pod off the turbo, but happens with the standard airbox still), and gutterd cat with a single 3inch cat back system) Im thinking either a problem with the tune (which is strange as I dont know if tunes could muck up from the box) or perhaps an injector is miss firing, or dirty which may explain why it happens when pushed harder on the 10psi tune. Hoping somone may have had a simular problem and can help me figure out whats wrong. Cheers,Andy Edited 28/04/10 03:33 PM by andyturbo Link to comment Share on other sites More sharing options...
Stazza_Brendan Donating Members 686 Member For: 15y 3m 4d Gender: Male Location: Mackay QLD Posted 28/04/10 03:56 PM Share Posted 28/04/10 03:56 PM How many Km's?Original coil packs? Link to comment Share on other sites More sharing options...
Benji_vs Donating Members 403 Member For: 16y 8m 8d Gender: Male Location: East Suburbs Melbourne Posted 28/04/10 09:34 PM Share Posted 28/04/10 09:34 PM Replace your plugs Link to comment Share on other sites More sharing options...
BensXR6T Member 478 Member For: 16y 9d Gender: Male Location: Burpengary QLD Posted 28/04/10 09:37 PM Share Posted 28/04/10 09:37 PM regap your plugs ... Link to comment Share on other sites More sharing options...
Benji_vs Donating Members 403 Member For: 16y 8m 8d Gender: Male Location: East Suburbs Melbourne Posted 28/04/10 09:51 PM Share Posted 28/04/10 09:51 PM Do you have yours gapped to .8? Do you notice any rough idle? I have a set of 0.8mm re-gapped plugs at home but im currently using the standard issue Ford 0.9 gap and they seem to be going alright.Is there much difference? Link to comment Share on other sites More sharing options...
andyturbo Member 500 Member For: 20y 10m Gender: Male Posted 29/04/10 07:55 AM Author Share Posted 29/04/10 07:55 AM (edited) Thanks for the replies guys, Cars just clicked over 110,000km. Havn't touched the plugs. Do I need to put special ones in there (high performance ones?) or can I just take it somewhere cheap like kmart auto and ask for new spark plugs? Coil pack is standard. And actually yes, I did notice rough idle occasionly it would drop 300rpm or so. Could the plugs be responsible for the boost leak, or would that just be the backfiring problem? Edited 29/04/10 07:57 AM by andyturbo Link to comment Share on other sites More sharing options...
Buf-Phoon loitering with intent Lifetime Members 13,318 Member For: 21y 4m 27d Gender: Male Location: Zombie Birdhouse Posted 29/04/10 08:12 AM Share Posted 29/04/10 08:12 AM process of elimination. Do your plugs first and (std Fraud ones will do)gap them Wouldn't hurt to clean the throttle body and do boost solenoid maintenance as well.Next step coil packs , get a new one and rotate with each existing one to see if that identifies a culprit.I would recommend a custom tune ASAP. Don't trust generics and never will Link to comment Share on other sites More sharing options...
20pounds Member 180 Member For: 16y 3m 21d Gender: Male Posted 29/04/10 09:16 AM Share Posted 29/04/10 09:16 AM are the xr6t coil packs the same as a stock xt?? Link to comment Share on other sites More sharing options...
F6turbo Member 172 Member For: 18y 7m 11d Gender: Male Location: Sydney Posted 29/04/10 09:24 AM Share Posted 29/04/10 09:24 AM I dont see how you cant afford to get a custom tune but are willing to run a generic tune which has a chance of stuffing your engine. You can get a custom tune for $390 these days. Even though your issue is probably something minor I wouldn't be running a generic tune at all. Link to comment Share on other sites More sharing options...
GOLDIE My new toy Lifetime Members 5,344 Member For: 21y 8m 24d Gender: Male Location: stanthorpe wine capital of qld. Posted 29/04/10 10:00 AM Share Posted 29/04/10 10:00 AM are the xr6t coil packs the same as a stock xt??Yes they are.As for this problem I would suspect the plugs on a standard turbo they should be replaced at 105 000 kms acording to ford but I recon 80 000 kms is enough.Ian Link to comment Share on other sites More sharing options...
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