N P

My V4 type r does not like hot weather, it misfires and cut out as soon as it is coming on boost after about 20 mile. late evening its ok seems it just does it mid afternoon when its hottest. Im running gems ecu with fmic . Any help much appreciated.

jonny81

did you get this sorted mate? my sti2 is exactly the same

magicseven

If you start to missfire under high boost/high rpm then you might need a smaller gap in your spark plugs.
If the gap is too small you will kill the engine, so use a gauge to get the right gap on each plugs ok.

404BHP

gap should be .06 also try 7,s instead of 6,s

magicseven

Yeah 7s is about right. buy a good spark plugs, for about £15 each

jonny81

Iv got new NGKPFR7's and new coil packs.

The thing is it only does it on a really hot day,iv got an induction kit on aswell,could it be down to not getting enoough cold air?

dazdavies

iTrader: (22)

Mine did this. It was fine normally however after a few hard runs it would start to misfire. Turned out to be a bit of grease on the crank position sensor.

Give that and your camshaft position sensor a good clean.

Daz

jonny81

I could drive it hard all day long and it wouldnt do it, however when the weather is really hot it will do it even if i have driven sensibely?

Its got me totally beat, the only thing i can think of is the induction kit drawing in even more hot air than usual.

Thanks for the replies though, might try your idea daz if putting the air box back on doesnt solve it.

Damocell

iTrader: (1)

Did you ever get to the bottom of this?

Damo

500

Heard there are some problems with the connections under the fuse box under the bonnet. take it out and check for corrosion on the plugs underneath.

Damocell

iTrader: (1)

I have had the same problem which I fixed today by gapping the plugs yto 0.7mm from the 0.8mm they were.

Damo