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Miss Fire After 4500 Rpm

clkngezz

By clkngezz,
in General Maintenance

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cosworth1971 Community Regular

cosworth1971

Posted
Posted
i have this in my 93 33gtst

its DEFINATELY the coils (have checked them)

with non restrictor plugs gapped to 0.6 and a power fc the problem is gone... although i dont spose a $1500 ecu is a cheap fix!

either way spitfore coils comming next :(

try 30 degrees static timing(but dont run it too hard until u know its not pinging) then u will ave the same problem fix as me.the only thing that has cured my problem is to wind up the advance(doesnt sound like it pinging at all).......I hope

any ideas on that?( i thought too high preasure for spark?) @10 psi :)

  • 2 weeks later...
clkngezz Enthusiast

clkngezz

Posted
  • Author
Posted

Ok guys bit of an update, still havent got my coilpacks yet $$$ none of it, i have now got my fmic, SAFC, walbro fuelpump, boost controller, running 12psi, boost gauge, 3inch stainless turbo back zorst, car is more power full yes, but hesitation is still there alot more now no jerk feeling just car feels like a slug between 4500 -6000 rpm, i was kinda hoping a tune into the Safc would fix the problem but no luck it even shows up on my dyno sheet lols, i will be investing in splitfires very very soon like maybe 2 weeks, ill post back with the result wish me luck guys please :(

dynoarrowey1.th.jpg

clkngezz Enthusiast

clkngezz

Posted
  • Author
Posted

yup, more than likely, i dont want to but buying splitfires from sliding performance, in doing this im ill have no money for a bout a month, but then at least its done :) and i can concentrate on actually driving my car instead of constantly worring about missing, i hopefully will have them by tuesday next week if sliding performance can send them out for that date, $525 delivered in 2-3 days is not to bad i think, considering nengun takes about 3-4 weeks when u buy them for $480 there, im willing to spend that extra to have them now :)

But what if it doesnt fix the problem :)

clkngezz Enthusiast

clkngezz

Posted
  • Author
Posted

yeh mine are coppers already and gapped at .8mm, im not going to be gapping them down anymore unless the splitfires dont complete the job, im sure they will though, damn i hate having no money since i have had this car, tis very fun though

  • 2 weeks later...
clkngezz Enthusiast

clkngezz

Posted
  • Author
Posted

ok guys bit of an update, i recieved my coils in mail today but im at work so i cant fit them until like 10 tonight should only take me about 30 mins or so to fit, i will take my car for a drive once there in hopefully prey to god it fixes the hesitation and my car will pull harder then ever before, but i wont be able to tell if my boost is spiking :D might have to turn it down a tad to like 10psi see how cold it is tonight, anyways ill let you all know late tonight and this thread can be a great help to majority or 33 owners with same problems :P

simpletool Mentor

simpletool

Posted
Posted

Sounds EXACTLY like the problem I am having. I'd love to here if the splitfires actually fix the problem. So thanks for the thread updates so far :D

Missing at 4500rpm, but not consistent. Happens more in lower gears than higher. Big affect on power, runs perfectly at lower rpm.

I have R34 SMIC, 10psi, 3" from turbo. Have cleaned and regapped plugs 0.9mm, checked coils (look perfect), new fuel filter.

Will be fitting walbro pump, copper plugs 0.9mm, clean AFM, SAFC 2. But I'm not confident it will fix it. I think it is coils too - but rather not spend over $500 if it's not.

As Sydneykid stated in other posts he beleives it's much more likely a running rich problem, not coils. How are you AFRs around this rpm point? Since you have dyno chart, what are AFR like?

clkngezz Enthusiast

clkngezz

Posted
  • Author
Posted

ok guys split fires are in and today was dry so i could test them a bit, hesitation is gorne still most probably going to try feel for it some more, cuz im not completlt convinced it has gorne, just curious if any one else with r33 gtst s1 at about 6000rpm car seems to pick up a little more? but definetly feels like its gorne, split fires did the job guys as far as i can feel :( most probably recommend .7mm coppers and splitfires fixes problem properly

have fun

ill post back if i notice change

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