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[B]Where to go from here[/B]- Advice please

ZILLAR5

By ZILLAR5,
in Engines & Forced Induction

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ZILLAR5 Explorer

ZILLAR5

Posted
Posted

my skyline has developed a missfire/hesitation from 4-5500rpm ..

mods are: 3inch, 10psi, Pod + CAI

i've done my research with this problem i.e spark plugs, running NGK coppers BKR6e 0.8 gap, which i replaced monday - problem still exists.

tried backing off boost to 8psi, taped Coil Packs - problem gone for a day even put boost back to 10psi - no problem. Decided to araldite them, put them back in and problem is back !! Even did night test with cover off - couldn't see sparks.

before i go out and buy splitfires, should i need to gap the plugs down to 0.7 ? but then i've read less spark = less power.

on the other hand .. could it be missfiring due to rich mixtures in which case an SAFC would solve the problem ?

i'd appreciate anyone comments.

Tanks :)

SLY33 Mentor

SLY33

Posted
Posted

absolutely nothing wrong with 0.7mm gap, although it is suited more to higher boost. 0.8mm is generally recommended, but after my last tune i was told to close them down to 0.7 and it cured a little miss (even tho the plugs are due for replacement!) I wouldnt think a set of splitfires will help. Im still using my original 1993 coil packs (some cracks siliconed) with no problems even running decent boost. Sounds like the old factory ECU coming into play to me. With the hesitation being the timing pulled out. The boost cut could still be in effect even tho you backed off boost due to a spike, espcially if your using a simple bleeder. I had these problems back in the day of the same mods you have.

mickr33 Community Regular

mickr33

Posted
Posted

............................................SAFC................................

...BTW, had the exact problem you have and racked my brain thinking it's the plugs gap, coils, air flow meter etc. But no it was the standard ECU running rich as when boosted. So an SAFC sounds good. No hesitation just all power right through. Oh and a decent 29 rwkw gain.

ZILLAR5 Explorer

ZILLAR5

Posted
  • Author
Posted
............................................SAFC................................

...BTW, had the exact problem you have and racked my brain thinking it's the plugs gap, coils, air flow meter etc. But no it was the standard ECU running rich as when boosted. So an SAFC sounds good. No hesitation just all power right through. Oh and a decent 29 rwkw gain.

I'm keen to hear Sydney Kids comments on the Jaycar Fuel Adjuster hes just installed ..

On the coil packs .. i just couldn't get my head around the fact that i taped the coils, and it fixed the problem for one day !! ducked up !

So do you still have factory Coil Packs then ?

BTW Thanks for your input :rofl:

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