80OMA Member 8 Member For: 14y 11m 21d Gender: Male Location: Toowoomba Posted 20/07/13 02:51 PM Share Posted 20/07/13 02:51 PM Hey Folks probably a long shot but I thought id as first.I recently had the head lifted on my car 2009 F6 310. While I was there I changed to atomic valve springs , atomic head bolts and gaskets atomic harmonic balance r etc. so no real performance enhancing items. When the head was refitted the car seemed to have a spit / misfire in the mid to high end RPM range. I have changed spark plugs / injectors / had a retune / and the miss fire remains.If any one has experienced anything similar would love to hear from themThanks in advance Link to comment Share on other sites More sharing options...
AdamIan69 Bronze Donating Members 401 Member For: 11y 7m 7d Gender: Male Location: WA Posted 20/07/13 03:04 PM Share Posted 20/07/13 03:04 PM Make sure your coils have a good earth. And make sure all earths straps are connected secularly and clean( including battery terminal). Link to comment Share on other sites More sharing options...
Chaos310 Donating Members 228 Member For: 12y 2m 27d Gender: Male Posted 20/07/13 03:09 PM Share Posted 20/07/13 03:09 PM good clean fuel? I have had a surge/misfire type thing going on with my old XR8 and I worked out it was the fuel I was getting from a particular servo... changed servo's and the problem went away after 2-3 tanks. no one knocked the timing sensors? they are known to mess about if care is not taken.air intake is holding pressure (no leaks at 30psi?) No exhaust restrictions? I had a vehicle once give misses and carry on ... turned out something in the exhaust had come adrift and was blocking enough of the exh to cause restriction at mid-high RPMjust thoughts.. Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 10m 9d Posted 20/07/13 03:16 PM Share Posted 20/07/13 03:16 PM I'll ask a silly question....What head gasket did you use? Link to comment Share on other sites More sharing options...
jas98 Member 1,030 Member For: 12y 4m 5d Gender: Male Location: Maryborough Qld Posted 21/07/13 10:48 AM Share Posted 21/07/13 10:48 AM Make sure your coils have a good earth. And make sure all earths straps are connected secularly and clean( including battery terminal).sorry if this sounds dumb, but what do you mean by earth for the coils?? where does it earth to? Link to comment Share on other sites More sharing options...
AdamIan69 Bronze Donating Members 401 Member For: 11y 7m 7d Gender: Male Location: WA Posted 21/07/13 11:55 AM Share Posted 21/07/13 11:55 AM Sorry mate ignore that. Just engine earths. I must of wrote what I was thinking. Link to comment Share on other sites More sharing options...
80OMA Member 8 Member For: 14y 11m 21d Gender: Male Location: Toowoomba Posted 09/08/13 12:33 PM Author Share Posted 09/08/13 12:33 PM ok so I was unable to solve my problem how ever it may have just reared its ugly head. I have had an engine light come on and the code is || IGNITION COIL C (COP-C) PRIMARY/SECONDARY CKT. so it seems my misfire is probably also been coming from a coil problem. I believe coil C is coil 3 obvously but which one is 3. 3 in from the belts or 3 in from the firewall Link to comment Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 16y 6d Gender: Male Location: SE Melbourne Posted 09/08/13 01:58 PM Share Posted 09/08/13 01:58 PM Change them all at once. Link to comment Share on other sites More sharing options...
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