XR6TTUB New Member 20 Member For: 7y 4m 19d Posted 07/12/17 01:57 PM Share Posted 07/12/17 01:57 PM Hello all and good evening ever since purchasing this car, I’ve been trying to fix this one and only annoying hinderence Car details ... 03 March ba xr6 turbo Ute with 5 speed manual symptom.. cold start: starts normally and smooth (no miss or abnormal behaviour) as as the temperature needle starts to climb, she starts to misfire,more hotter or longer I drive it, it gets more irregular. Alao sometimes, whilst idling and misfiring away, she would stumble,revs drop and pick up again now, I’ve Done numerous test on the vehicle and it all seems to be within factory/workshop manual specifications oil pressure - 60psi cold and 50-60 warm new coils and plugs new fuel reg new fuel filter new throttle body and updated TPS another set of known working injectors all new baskets around (hot and cold side) im a mechanic by trade, so this issue has me stumped. I’ve been diagnosing this issue for the last 2 months, but I can’t seem to replicate or trigger a change whilst doing so on my scan tool with live data, it seems to pull timing at idle and below is some data to look into VCTADV(VCT ADVANCE ERROR -9.13 VCTADV2(VARIABLE CAM TIMING 2 ADVANCE ERROR) -9.63 VCTADVERR(VCT ADVANCE ERROR) -0.69 VCTADVERR2(VARIABLE CAM TIMING 2 ADVANCE ERROR) 0 VCTDC(VARIABLE CAMSHAFT TIMING DUTY CYCLE) 0 VCTDC2(VARIABLE CAMSHAFT TIMING 2 DUTY CYCLE) 0 hope someone can shed some light, also as a sidenote, car rev thru rev range smoothly (no misfire) ecu previously look like someone has tampered with it and the numbers on the side of PCM have been changed as I googled the numbers and came up with a F6 typhoon PCM kenny Link to comment Share on other sites More sharing options...
Puffwagon Trust me bro...tbh ;) 8===} Gold Donating Members 16,063 Member For: 9y 11m 24d Gender: Male Location: South Australia Posted 07/12/17 02:04 PM Share Posted 07/12/17 02:04 PM The earlier models have a different cam timing system than the later models. If it has got a different ecu then it could be telling it to do stuff it shouldn't be or vice versa. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,151 Member For: 16y 9m 12d Gender: Male Location: Melbourne Posted 07/12/17 02:12 PM Share Posted 07/12/17 02:12 PM seems like a VCT solenoid problem. Link to comment Share on other sites More sharing options...
BAXRTUTE Gold Donating Members 2,639 Member For: 8y 9m 4d Posted 07/12/17 02:13 PM Share Posted 07/12/17 02:13 PM Did u happen to throw a new 02 sensor in? Mite be dyno time though tbh, or off to ford to clear the file and reload the stock BA one in. Go dyno though, power gains though that 5sp mite die after a power gain. Link to comment Share on other sites More sharing options...
Rab WOT? Moderating Team 10,981 Member For: 11y 10m 28d Gender: Male Location: Frankston, 3199 Posted 07/12/17 02:20 PM Share Posted 07/12/17 02:20 PM Jumped a tooth? Or was that just FG's? Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,151 Member For: 16y 9m 12d Gender: Male Location: Melbourne Posted 07/12/17 02:23 PM Share Posted 07/12/17 02:23 PM yeah, could be a partially broken timing chain guide (happens in all barra's) Link to comment Share on other sites More sharing options...
Gabbo_32 Member 69 Member For: 10y 9m 1d Gender: Male Location: SE Melbourne, Victoria Posted 07/12/17 08:45 PM Share Posted 07/12/17 08:45 PM those codes are similar to the ones mine threw when it jumped 2 teeth from a broken guide Link to comment Share on other sites More sharing options...
XR6TTUB New Member 20 Member For: 7y 4m 19d Posted 08/12/17 06:59 AM Author Share Posted 08/12/17 06:59 AM Thanks for the quick responses ladies and gents o2 sensor is still the old one, haven’t replaced it yet as the values don’t go over or under reccomended values ive Rescently replaced the cams with some later model bf cams as I had the dreaded ticking and tapping noise on cold start. Sorted that problem out though so when I was changing the cams, I lined up all the coloured links on the chain to designated marks on cam and balancer, seems everything is spot on, and the guides are intact and undamaged one quick observation though, with everything lined up hunky doory, the 2 marks stamped on cam phasers sit slightly off middle at 11 o’clock, cause if it did jump a tooth or 2 none of the coloured links would of lined up like I previously stated, sometimes car would idle fine, no hiccups. 4/10 times she would idle with a miss. dyno tuning is in process, currently getting all the bits I need before I send it off (valvesprings,injectors and fuel pump) kenny Link to comment Share on other sites More sharing options...
XR6TTUB New Member 20 Member For: 7y 4m 19d Posted 09/12/17 01:47 AM Author Share Posted 09/12/17 01:47 AM Another thing before I forget. I had access to some vct solenoids and thought why not throw them in and see if it makes any difference I had one issue with them, one on the engine seemed thinner without any filter screens and ones I had to replace them with are thicker and has filter screens Link to comment 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