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R33 s1.5 missing at 5,000rpm onwards.

Killer33gtst
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Killer33gtst Explorer

Killer33gtst

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Hi all, l didn’t want to put anything on the forum, however l am unable to work this out and am extremely frustrated, hopefully someone can give me some good direction.

the car blew a cooler hose, since then it has developed a miss at approx 5,000 rpm upwards.

the strange thing is that it now fowls only plug number 6.

all others are fine.

changed coil packs around and same issue.

new coil loom, same. Car runs, idles and drives fine, as long as you don’t go past 5.000 rpm.

running apexi fc. Has had tune. Developed this after the tune. However was running amazing until the hose blew off. 
Boost is a conservative 15.

if anyone can give me some direction it would be greatly appreciated.

regards.

 

 

 

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Ben C34 Grand Master

Ben C34

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Sounds like it had a boost leak ( the cooler hose about to pop off) and was tuned to suit that. Now boost leaknis gone tune is wrong.

 

Did you pressure test the cooler pipes before the tune?

 

joshuaho96 Veteran

joshuaho96

Posted
Posted
  On 28/05/2022 at 1:43 AM, Killer33gtst said:

Hi,  the only thing l am confused with is at to why only number 6 is fowling???

thanks.

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Do a compression test then check the injector flow. If there's per-cylinder fuel trims make sure it's reasonable too.

Killer33gtst Explorer

Killer33gtst

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Yes, plugs changed, several sets now.

has had new cooler piping both sides.

turbo  side to air filter done pre tune. Intake done only a week ago. Still same problem.

 

Car ran perfect after tube, 232rwkw. @ 15psi.

drove it 250kms after tune, no issue. Gave it a few short drives and it, again, was perfect.

blew the intake pipe to plenum off. 

once this happened it ran like shit.

changed plugs as they were all Fouled. 
since then it has had the issue.

Appreciate everyone’s input.

 


 

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

I have seen a car foul plugs mysteriously more than others, and it turned out to be the diaphragm in the FPR that had failed, sending fuel into the plenum into two cylinders specifically.

Something mechanical has let go in the cylinder that is fouling. It would be very suprising to somehow make a tune that only fouls 1 cylinder unless you are playing with cylinder trims, which I don't think is very common on a powerFC.

You need more data available to you. Is the problem spark related? Fuel related? You may need a dyno to figure this out.

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