pjcampbell Posted January 24, 2020 Share Posted January 24, 2020 (edited) I have a 2005 EJ259 (NA) with a 14psi supercharger on it. It misfires on cyl 1 and only occurs under high load higher rpm (5200+rpm). I have tried swapping coil, plug, wires and injector and it doesn't go away. It is the highest leaking cylinder, around 8% and the leakage feels like it is coming from the exhaust valves (I did the leak down test with the motor out and felt air on the exhaust side of the head). Compression is still really decent like 175psi. I'm thinking about having the heads redone but thinking I should be considering popping the cylinder out of the bore to examine it. Any ideas on the symptoms? Edited January 24, 2020 by pjcampbell Link to comment Share on other sites More sharing options...
Max Capacity Posted January 25, 2020 Share Posted January 25, 2020 What is the gap on the spark plugs ? For a boosted motor you close the gap. GT's run .028" On are race car at 35psi we ran a gap of .018" 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
pjcampbell Posted January 26, 2020 Author Share Posted January 26, 2020 (edited) Thanks - I've tried both coppers and iridiums down to .021" . Right now it's on copper's but I think iridiums are superior for boost. It is only misfiring on cyl #1 (all running same plugs and gap). These are both #6 plugs. I have not tried #7's and not really sure if they are necessary. It only makes about 380-400 crank hp. but if I figure out the problem will go up to about 450 crank hp and ~17psi. I am sure I can and should run quite a bit larger gap than .021", I just shrunk it down so far in an effort to see if the misfire would go away. I do run water/meth, so there is more "stuff" in the cylinder to get a spark through but #3,2 and 4 have no issues. Edited January 26, 2020 by pjcampbell Link to comment Share on other sites More sharing options...
ttnio Posted January 26, 2020 Share Posted January 26, 2020 how about any anti seize stuff on the plugs? Link to comment Share on other sites More sharing options...
Max Capacity Posted January 27, 2020 Share Posted January 27, 2020 Have you called NGK and asked for Tech Support. tell them what your doing, they may have a better plug to use. I talked with them back when we boosted the Honda 1.6L single cam. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
pjcampbell Posted February 4, 2020 Author Share Posted February 4, 2020 how about any anti seize stuff on the plugs? I don't think so - I don't generally put any on. I've never had any problem getting the plugs out. Link to comment Share on other sites More sharing options...
pjcampbell Posted February 4, 2020 Author Share Posted February 4, 2020 Have you called NGK and asked for Tech Support. tell them what your doing, they may have a better plug to use. I talked with them back when we boosted the Honda 1.6L single cam. I haven't tried talking to NGK but the BKR6EIX is an excellent spark plug so it should not really give me any issues. Link to comment Share on other sites More sharing options...
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