BA XR8 Rough idle and missfiring - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

bass · 08-25-2007, 07:01

Just bought it and its missing and idling bad. worse when warming up. misses bad when taking off first thing in the morning. and all day but not as bad. I know its not a new problem but who has had this and fixer it? what fixed it??

qik40t · 08-27-2007, 04:55

try this maybe it mite work take the negative off the battery for half hour reconect it go for drive for half hour then let sit with the engine running for 15 minutes see how you go

bass · 08-31-2007, 03:05

what does this do? have you tried it? i believe its an ignition problem but i dont want to go buying things and do trial and error. it can get pretty expensive. i spent 1500 on the LTD and it ended up being the leads, which were new mind you. but as the XR8 is under warranty i will let them do the changing at their expence.

qik40t · 08-31-2007, 19:18

reset the pcm and clears your trouble code

qik40t · 12-24-2007, 21:48

its sounds like your coils have shit them selves if not then check your spark plugs that they are the right ones

bass · 12-25-2007, 04:55

it was fixed a few months ago. needed a custom tune to suit the exhaust that was fittet to it. purrs like a cat.

Paul V · 12-30-2007, 21:39

Is it still doing this?
Did you replace the heades?

O2 sensors can be a pain in the butt.

Regards
Paul

bass · 12-31-2007, 00:36

yup it had something to do with the headers and the O2 sensors. i had it on the dyno and a custom tune fixed the problem. I think they add fuel in the tune.

Paul V · 01-07-2008, 18:23

Quote:

Originally Posted by bass

yup it had something to do with the headers and the O2 sensors. i had it on the dyno and a custom tune fixed the problem. I think they add fuel in the tune.

There have been occasions where the sensor mounting positions do not match with the standard headers, and a patch cable is made up. The impedance of the cables do not match, and bingo false readings. Or the sensor was damaged in the removal and replacement
These issues were predominately in the early days of the BA release.

Changing the headers should also invovle a custom tune. Think about it. The car is set up as standard, changing the headers will have an impact, thus the engine tune needs to be addresssed.

Regards
Paul

bass · 01-07-2008, 19:50

its fixed now. laid to rest