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4g63t missfire.. help!!
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<blockquote data-quote="nan83" data-source="post: 4453652" data-attributes="member: 6718"><p>hi all.... now i still troubleshooting my missfiring prob.... </p><p></p><p>on idle = smooth </p><p>accelerate = smooth </p><p>boosting = smooth </p><p></p><p>misfire only at above 4000rpm while part throttle or maintain rpm... it happen at all gear while cruising at above 4000rpm.... while the misfire happen, i see the temp gauge is fluctuating , the needle go up & down, but it not go below 70'c & above 95'c lah.... </p><p></p><p>i already check : </p><p>1. cable plug resistant not above 400ohm... </p><p>2. plug gap 0.7mm </p><p>3. change cas sensor </p><p>4. bypass ignition module..... run direct from e6x to dynatec arc to coil.. still missfire... </p><p>5. check all ground wire (ecu & sensors) </p><p>6. check wiring to injector & coil </p><p>7. check injector resistance... </p><p>8. intake manifold & banana no leak.. ( only small leak at TB shaft seal )</p><p></p><p>all above i check no prob, but misfire still there... make me penin... huhuhu </p><p></p><p>thing still not done : </p><p>- ignition coil still not replace </p><p>- fuel filter still not change </p><p>- injector still not sonic clean </p><p></p><p>what inside my head know is : </p><p>- injector not balance... </p><p>- electrical prob (interference or something)... it make my temp gauge fluctuate & missfire </p><p></p><p>------------------------------------------------------------------------------------------- </p><p></p><p>the ign timing & fuel map i already tune.... try lean, try rich afr... still missfire... try advance & retard timing also missfire... make me mad.... huhuhu </p><p></p><p>my car spec: </p><p>4g64 block with fairlady piston </p><p>tomei 260 dynatec ignition </p><p>PE 1000cc injector </p><p></p><p>huummm..... my fairlady piston low about 2mm from block... can it cause missfire???? my car also dun like to tune at stoich while cruising.... need to set 13-12:1 afr to smooth it... huhuhuhu.... pening2 hope all can give input about my prob... thanks all!!!</p></blockquote><p></p>
[QUOTE="nan83, post: 4453652, member: 6718"] hi all.... now i still troubleshooting my missfiring prob.... on idle = smooth accelerate = smooth boosting = smooth misfire only at above 4000rpm while part throttle or maintain rpm... it happen at all gear while cruising at above 4000rpm.... while the misfire happen, i see the temp gauge is fluctuating , the needle go up & down, but it not go below 70'c & above 95'c lah.... i already check : 1. cable plug resistant not above 400ohm... 2. plug gap 0.7mm 3. change cas sensor 4. bypass ignition module..... run direct from e6x to dynatec arc to coil.. still missfire... 5. check all ground wire (ecu & sensors) 6. check wiring to injector & coil 7. check injector resistance... 8. intake manifold & banana no leak.. ( only small leak at TB shaft seal ) all above i check no prob, but misfire still there... make me penin... huhuhu thing still not done : - ignition coil still not replace - fuel filter still not change - injector still not sonic clean what inside my head know is : - injector not balance... - electrical prob (interference or something)... it make my temp gauge fluctuate & missfire ------------------------------------------------------------------------------------------- the ign timing & fuel map i already tune.... try lean, try rich afr... still missfire... try advance & retard timing also missfire... make me mad.... huhuhu my car spec: 4g64 block with fairlady piston tomei 260 dynatec ignition PE 1000cc injector huummm..... my fairlady piston low about 2mm from block... can it cause missfire???? my car also dun like to tune at stoich while cruising.... need to set 13-12:1 afr to smooth it... huhuhuhu.... pening2 hope all can give input about my prob... thanks all!!! [/QUOTE]
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4g63t missfire.. help!!