Car still miss firing HELP!

[Kaido_RR]

Hey,

Will i just got my major serives done had everything change filter,oil, plugs etc. Now before the services it was miss firing majorly as soon as i hit boost i lost all power and just got pop pop pop.

Now after the serivces it still happens around the 4,5k rpm mark, i lost power and get like a droning sound :confused:

Im soo confused i just spent major money on the car i through it would fix the problem :S im going back to the place 2morrow but for the time being anyone got any ideas

PLZ HELP!!!

THanks mike

[benm]

Quick and easy solution. Swap your coils for a set of 'working' coils and see if this fixes the problem.

[GUN R33]

have much boost are you running? I had the some problem and I thought that it was my plugs I changed them and it still did it. the realised that the stock cpu had a boost cut at about 9psi, I plug my untuned powerFC in and run perfect and boost to 12psi perfectly

[drifto]

Boost cut sounds right but it would come on then off if you keep your foot into it.

Find out what spark plug gap is set aswell.

Wouldn't faulty coils misfire all the time and at any rev range?

[Ronin 09]

Wouldn't faulty coils misfire all the time and at any rev range?

Not necessarily... I just changed my coils b/c they were blowing out on load / boost. Solved the problem

[RBVS]

gap your plugs down to .8 or lower. the new plugs are firing better but in the 4000 up is were you will have full boost and they just cant cope. Had the same thing many a times with mates cars and mine, easy fix.

[Zahos]

If you search on this topic, you will find that one or more of the following 3 solutions will fix your problem....

- spark plug (gap/heat range). You will find coppers gapped at 0.7 - 0.8 mm will work best for you. For a street driven car with basic mods (FMIC, boost, exhaust, SAFC/PFC , etc), stay with a warmer heat range - 6.

- coils: measure the resistance accross all coils when cold, make note of it. Then meassure them again when hot. You will find faulty coils will have a different resistance to a healthy coil when warm.

- A:F ratios. Get it on a dyno to see what your A:F ratios are like where it pops. I'm guessing they will be extremely rich at that point. A SAFC will help you sort those out, or even better, a PFC to help with your timing issues also...

Zahos