Misfire on all cylinders
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Joined: Nov 2008
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From: Pittsburgh, PA
Misfire on all cylinders
Can anyone on here please help!! Im lost and dont know what the next step is. The car is running fine and made 520whp on Evans dyno and 487whp on a dynojet.
Well it appeared that I had spark blow out. I removed my heat range 8's spark plugs and replacd them with 9's. I took the car around the block today and I took it up to 8K and when I shifted gear and got back into it nothing happened when I pressed on the gas. I let off shifted up and then everything was fine. This happened to me twice. I measured the 9 plugs before installing them and they apeared to be gapped at .30". I noticed when I plugged into flashpro I had a DTC for 1 & 4 misfires. I regapped the plugs down to .22" and swapped coils #1 with #2 and #4 with #3. It corrected the spark blow out but not the misfires.
Any thoughts from anyone?
Update 08/04/11- Guys im still having issues with my S2000 I get miss fires on ALL cylinders and I am out of ideas other then replacing coils and the battery. I have tired running 8's and 9's gapped to .020" on race fuel and I get the same thing. I have tried 8's gapped to .020" on 8lbs and 93 octane and I get the same thing. My car on has 12K miles on it and would hate to have to buy new coils. Anyways which ones are the best? Should I try a new battery first? If so which one? I even added a ground to the back of the valve cover and no luck. I adjusted the valve and all were within specs or .001" out but we adjusted them on the tighter side.
Update 08/05/11-well I had the battery tested and it came back with 340 CCA and its rated for 410 with a 12.97 Voltage reading. To me that sounds fine but all three different places said the battery is a little less then half of its state and needs replacing. Does this sound right? Should I just replace it due to my misfires?
Update 08/08/11- I replaced the battery and no difference. I took the car to a shop and put it on a dyno. Fuel pressure is 60psi base (vacuum unhooked) and ~55psi at idle. During the pull the fuel pressure climped to ~80psi at redline and 18psi. We also swapped in some RSX coils and no change. I did realize that it only misfires at higher RPM's and light throttle. The shop tired pulling 5 degrees timing in low cam and high cam light throttle and no change. He said the car pulls and feels great.
Well it appeared that I had spark blow out. I removed my heat range 8's spark plugs and replacd them with 9's. I took the car around the block today and I took it up to 8K and when I shifted gear and got back into it nothing happened when I pressed on the gas. I let off shifted up and then everything was fine. This happened to me twice. I measured the 9 plugs before installing them and they apeared to be gapped at .30". I noticed when I plugged into flashpro I had a DTC for 1 & 4 misfires. I regapped the plugs down to .22" and swapped coils #1 with #2 and #4 with #3. It corrected the spark blow out but not the misfires.
Any thoughts from anyone?
Update 08/04/11- Guys im still having issues with my S2000 I get miss fires on ALL cylinders and I am out of ideas other then replacing coils and the battery. I have tired running 8's and 9's gapped to .020" on race fuel and I get the same thing. I have tried 8's gapped to .020" on 8lbs and 93 octane and I get the same thing. My car on has 12K miles on it and would hate to have to buy new coils. Anyways which ones are the best? Should I try a new battery first? If so which one? I even added a ground to the back of the valve cover and no luck. I adjusted the valve and all were within specs or .001" out but we adjusted them on the tighter side.
Update 08/05/11-well I had the battery tested and it came back with 340 CCA and its rated for 410 with a 12.97 Voltage reading. To me that sounds fine but all three different places said the battery is a little less then half of its state and needs replacing. Does this sound right? Should I just replace it due to my misfires?
Update 08/08/11- I replaced the battery and no difference. I took the car to a shop and put it on a dyno. Fuel pressure is 60psi base (vacuum unhooked) and ~55psi at idle. During the pull the fuel pressure climped to ~80psi at redline and 18psi. We also swapped in some RSX coils and no change. I did realize that it only misfires at higher RPM's and light throttle. The shop tired pulling 5 degrees timing in low cam and high cam light throttle and no change. He said the car pulls and feels great.
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