autoserve

still cant get hold of nige! ive left a message and a email but no response so i sent ecu to eddie walsh at megasquirtuk (very helpfull bloke) he found 2 faulty transistors and also said that the jumper wires on board were unisulated and running very close to other parts of board he said he had never seen one assembled like this before and it was a very crude way of fitting wires. hope this will cure faults many thanks to all for your help

yes that is correct i have reset settings back to original map as supplied by nige wich it ran on before, i also playes with injector times etc and still no differance

cant seem to get hold of nige, perhaps he is on holiday

Hi I purchased the kit from Nige at megasquirt v8, i fitted kit with no problems but always seemed to have a rich misfire on right bank thinking that this was down to tuning i thought nothing more of it and carried on building car,wasn't able to road test as i hadn't finished building rest of vehicle. i have now finished car and was hoping to tune engine. started road testing but engine runs very rich on right bank i have tried swapping injector wires from the rich lumpy right side to the other and the problem then changes to left bank. so i thought i must have a fault with wiring, disconnected ecu plug all seems fine carried out various wiring tests and all seems good tried to start engine again and now no start carried out a few more tests to find that now my injector pulse wires from ecu aren't pulsing there just live+12v all the time played around with injector settings but still no pulse. so now i'm thinking that this has been the intermittent fault all along and now its not pulsing at all so no start. i tried to scope the injector wires but they stay a constant +12v (earth when ignition off) have i got a fault in ecu?? i think i may have a damaged injector transistor hoping that this has been the intermittent fault all along. also tried testing ecu output to injectors with injectors disconnected but still +12v no pulsing

Yes that is the problem ms isnt grounding injectors i scoped the ms input from edis and a good pulse is there. must be fault inside ecu

Right then i have tried swapping injector wires from the rich lumpy right side to the other and the problem then changes to left bank. so i must have a fault with wiring, disconected ecu plug all seems fine carried out varios wiring tests and all seems good tried to start engine again and now no start carried out a few more tests to find that now my injector pulse wires from ecu arnt pulsing there just live all the time played around with injector settings but still no pulse. so now im thinking that this has been the intermitant fault all along and now its not pulsing so no start. i tried to scope the injector wires but they stay a constant 12v (earth when ignition off) have i got a fault in ecu?????????

the injectors have just been roconditioned with good spray patterns and flow matched. i have a standard fuel rail that feeds the left bank first then goes round front of plenum to right bank. i have another fuel rail that feeds the other way perhaps ile try that one to see if theres a differance. i am currently waiting for delivery of a usb to serial port adaptor as my serial port lap top seems to have given up so i cant plug in at the moment but when i get it i will try playing with injections. the more i think about it the more i seem to think that the compressions are low on right bank when engine is running maybe due to lifter pump up and inlet valves arnt closing properly (this would explain wet black sooty stuff on inside of trumpets on right bank) i know that the lifters on right bank recieve oil first could there be some kind of blockage causing more oil pressure on right bank lifters? i have tried a cyclone cam in engine and also anaother new set of delphi lifters but it was still running rich and idle was not so good so ive gone back to the piper cam. the pre loads were set to spec. i am using old style front cover with gear driven oil pump running about 40 psi at idle. i tried lowering oil pressure using another weaker spring to avoid pump up but it just made lifters noisey. Many thanks to all that are helping me with this nightmare. Tom

new plugs fse fuel pressure reg running 36psi 170 compresions on all cylinders the twin plenum is 2 3.9 plenums cut in half and welded together, it doesnt seem to make any differance wich throttle body i use to rev engine it always runs rich on right side. could it be down to bad porting or maybe cam timing

hi all I have a 4.6 v8 engine running megasquirt, piper 270i cam, ported heads, twin plenum, and 45mm inlets. the engine has always run very rich on the right bank and runs slightly rough and missfirey at low revs since assembly, i have tried various tests to solve problem including recon injectors new plugs coils leads oxygen sensor but still no solution. i have tested injector feed using occilisciope both banks seem the same. i can see using a coulor tune (screws in spark plug hole to see combustion) that all cylinders on the right bank are running rich (orange burn RICH BURN) and left bank are all bunsen blue CORRECT BURN, i am running out of ideas please can someone throw some light on this problem??? could it be down to lifters not allowing valves to close on right bank? or the second hand heads that were already ported are ported incorrectly and 1 is flowing more than the other? the exhaust sensor was in the l/h manifoild when i had a straight balance pipe but then i fitted a x balance pipe and put sensor in the centre but still no change, was thinking of putting sensor in r/h manifold but if cylinder banks are running incorectly i cant see that this will resolve problem. Also all the inlet trumpets and manifold on right bank are wet and sooty on inside and l/h bank are dry.