Hi all,
I've just finished building my track car for the nurburgring in a weeks time and have been running her around to iron out the last bugs. I've been checking the A/F ratio with a wideband for the last couple of days, seems i have an under-fuelling problem.
1. From cold start idles OK but will stall revved high then dropped hard. AFR on cold start is swinging around in clossed loop high to low.
2. For the first couple of minutes of driving assuming she's cold then cruise AFR is 14.4, light accelerate is 13-12, WOT is around 10-12
3. After a couple of minutes on continual load (cruising) the A/F is showing around 15.5 to 16, on WOT A/F is around 17.5, partial around 16.5
I popped the plugs out and they look clean, light brown in colour with some white pitting.
She feels sluggish under acceleration and will sometimes stall at idle when coming down from acceleration or cruising. I've replaced the ICV already and done the TB heater plate removal, replacing all the vacum hoses and ICV hoses in the process.
Can anyone help point me in the direction of what might be causing this running problem? I've only got a couple of days to sort this out before we head of to germany!
My build thread is here:
http://www.m42club.com/forums/showthread.php?t=7825
Fuelling issue thread here:
http://www.m42club.com/forums/showthread.php?t=8254
Air Fuel Ratio - running lean - help!
Moderator: martauto