R34 Gtr - Ngk Platinum Pfr6A-11 - Gap Down To 0.8? Yes / No?

[iwanta34gtr]

Hello everyone,

I have recently put new spark plugs in my R34 GTR. My car is completely standard, I used NGK Platinum PFR6A-11.

I will be installing replacement genuine nissan coil packs on the weekend, while i'm in there - was thinking about gapping the plugs down to 0.8.

It may just be me, but i'm still feeling a very slight miss under low RPM - just before it comes on boost and mainly when the car is cold.

I remember reading previously that gapping the plugs was recommended. Thoughts?

My car has already been -

- Leak tested, intake manifold gasket replaced with Nitto gasket

- Plugs changed - NGK Platinum PFR6A-11.

- Rear AFM replaced, front AFM tested - both are perfect

- Timing checked

- Fuel filter replaced

Thanks in advance for advice and direction.

[Moodles2]

Gap the plugs down, lose power.

I've bolded the problem for you.:

It may just be me, but i'm still feeling a very slight miss under low RPM - just before it comes on boost and mainly when the car is cold.

[DVS JEZ]

So the plenum gasket was replaced and it still has a constant miss at idle?

Have u done a comp test etc

[iwanta34gtr]

Hello,

Thanks for the replies.

The behaviour is not on idle, its when driving under low RPM and its intermittent - mainly when its cold. When it warms up, all is well.

Poor choice of words on behalf of myself, its not a miss (my mechanic has already kicked my ass for calling it a miss), but I dont know how else to explain it. Just to me, it seems a bit doughy and hesitant while driving in the low RPM range. Comes alive in the higher RPM as expected.

My mechanic has checked it and told me this is what stock GTR's are like.

Will install the new packs, and not gap plugs. See how she goes.

[Hadouken]

Have you gotten your tune checked?

[DVS JEZ]

Few possibilities-

Fuel pump voltage too low

02sensors faulty

Try unplugging the 02 sensors and see if it inproves. Theyre located on the turbo dump pipes

[iwanta34gtr]

Hi Everyone,

I removed the plugs and coil packs a few days ago.

Did not gap the plugs, just checked and refitted them.

I was lucky enough to also have two replacement sets of low KM coil packs handy - so I put a new set in.

While I was at it, also cleaned both AFM's and reset her ECU.

After this, she's now alot more responsive in the low RPM range as expected so im happy with the result.

Thanks again.

[iwanta34gtr]

Forgot to mention, also did the TPS reset step (and im not sure if it has helped or whether it is purely for the MFD reading).

I had an issue where when the TPS was set in the correct place, it was showing a 4% reading on my MFD.

Wrote instructions for this piece, its in the DIY section.

http://www.skylinesaustralia.com/forums/topic/403774-r34-gtr-tps-throttle-position-sensor-calibration-steps-showing-incorrect-reading/page__fromsearch__1