raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 15/02/14 11:21 AM Share Posted 15/02/14 11:21 AM Hi all I brought an 2002 xr6t with an blown auto I fixed it and then it was miss firing under load. As I thought I had it fixed it bent a Conrod and smashed the bore in no. 5. Anyway I replaced the engine with a 2008 engine basically the head and block and fitted out back with original sensors. I swapped the fuel pump and filters did plugs and coil packs cam sensors tested the cam VCT and test fine. Any one have a clue where to look next ecu or something like that. Coz I'm sick of spend cash with no damn results Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 19y 1m 5d Gender: Male Location: North West Hot Hell,VIC Posted 15/02/14 09:04 PM Share Posted 15/02/14 09:04 PM Backfires underload can be from lack of fuel. You really need to check fuel pressure at w.o.t with a guage .You say you have changed the pump but with what pump,new,s/h ?What did the new trans cost and where did you source it from. Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 15/02/14 09:20 PM Author Share Posted 15/02/14 09:20 PM Trans was a second hand one I picked up from a mate. It's a turbo box had same numbers as the one I pulled out. And the fuel pumps a new one from Bursons Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 19y 1m 5d Gender: Male Location: North West Hot Hell,VIC Posted 16/02/14 02:31 AM Share Posted 16/02/14 02:31 AM Whole pump assy or just new pump fitted to old unit?. Either way you need to do a pump pressure test at idle and at w.o.t.Most w/shops could test this pretty easily and would eliminate this as the cause or prove it to be the problem. Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 18/02/14 11:27 AM Author Share Posted 18/02/14 11:27 AM Fuel pressure and pump test fine 58 psi at idle wot is 62 psi. What should wot be at Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 18/02/14 11:30 AM Author Share Posted 18/02/14 11:30 AM Also I disconnect the exhuast and ran heap better also now brought newer plugs and regapped them to 0.9 now it sounds like dropping one cylinder and the load back fire has stopped so I would be guessing it's dropping spark somewhere Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 19/02/14 08:30 AM Author Share Posted 19/02/14 08:30 AM Today's effort is I found the large back fire it's the centre muffler now I have 2 hotdogs in place. Also for further info new plugs again have helped. Took it for another run and it's got heaps better and power till about 4000rpm. Now I did fuel pump today put in a walbrow 5 bar 320 what I deference wheel spin and sink into the seat up to about 3500 now and then cut out. Started running like a dog running on 3 or 4 cylinders and pinging like no tomorrow. I put a boost gauge on an went for one last drive. This time it hit 7 psi then started doing it again. And finally brought up the code P 1227 over boosting and P 1388. VCT over retardedCan the actuator jam on these Link to comment Share on other sites More sharing options...
Wenier Donating Members 1,736 Member For: 15y 5d Gender: Male Location: Christchurch, New Zealand Posted 19/02/14 10:14 AM Share Posted 19/02/14 10:14 AM What about coils. Maybe they are breaking down under load and not giving the spark. Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 19/02/14 09:02 PM Author Share Posted 19/02/14 09:02 PM That's first thing I change. no difference Link to comment Share on other sites More sharing options...
raiserbackxr6t Member 10 Member For: 10y 11m 7d Posted 20/02/14 07:05 AM Author Share Posted 20/02/14 07:05 AM Found it it's got a 10 psi actuator spring. Took it for a run today and buy passed the factory boost controller. And wound right out to 10 psi. Now for a flash tune to suit Link to comment Share on other sites More sharing options...
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