Rb25det Miss Fire

[BHDave]

im running heat range 7 plug gapped at .8

I run 7's aswell and have found them to be a bit touchy if the mixtures aren't right, I occasionally get a fouled plug on warm start and the engine drops a cylinder temporarily, so it may be contributing to your problem aswell. But check mixtures first.

[l0WRB]

I run 7's aswell and have found them to be a bit touchy if the mixtures aren't right, I occasionally get a fouled plug on warm start and the engine drops a cylinder temporarily, so it may be contributing to your problem aswell. But check mixtures first.

all fixed now i put in splitfire coils and regapped to 1.1 and the car revs cleanly! its wonderful 2 drive now hehe

[VLT025]

This is IMO absolutley ECU.

To back it up.

I have a Jaycar DFA - it's a air flow voltage adjuster that works like a safc.

The DFA has a switching mechanism that turns on the voltage regulation, only atfer the car has started.

I installed it and had it tuned and my car was going well, with no misfire. It had repaired colipacks and spark gapped at 0.8mm.

Anyway, one night, my car seemed sluggish at 10psi. This was at the start of winter this year. Then on cold nights, it would pop and fart and misfire etc.

After checking things out, I found that the adjustment for the DFA to kick in after the car had started was out, and not kicking in. The original afm voltage was being put though to the ECU. After recalibrating the DFA so it would kick, the car went better than ever, all problems solved.

It would seem that on cold nights, the air is denser ^whatBHDavesaid^ and your ecu dumps heaps of fuel in making the mixture rich. This will cause misfire. It's like a protection mode. Seems to happen with engines fitted with pods and intercoolers more frequently.

Now your colis might not be good enough, but I would think that if your colis are stuffed, you would get the misfire all of the time, and not just when cold.

So your solution IMO is to get an apexi Power FC Computer, or an apexi SACF2 , or build a Jaycard DFA. Then get whatever you pick tuned.

I also netted a 20kw or more gain with the DFA. If I get more money, (and I don't sell the skyline) I will be buying a Power FC from a group buy from the forum.

Chriso

I'd be interested to know if this gain was due more to the ability to run more boost, or just A/F tuning, as I have built the hand controller and am about to get the DFA. this is what my A/F looks like at 9psi. I'd love to get an extra 20-25RWKW with a bit more boost