Skyline misfiring when hot ...

**Maxx** · 06-08-2011, 07:29 PM

First of all , sorry for my bad english , I'm french but doing my possible ...

The car has been stored till 2 years ...

I bought the car , then I changed ...

Spark plug , every oils (tr case , engine , tranny , diff frt / rr) gas filter , air filter etcc...

At first I had BCPR6ES-11 gapped 0.34 and they told me my misfire was due to this but it wasn't the problem

Second , they told me it was because I had platinum and RB don't like them so I bought BKR7E (copper) gapped to 0.29 and it's still wasn't the problem...

Third , I Just changed my coils for yellow jacket one , and the problem still persist !

So now , what could I do ?

Note: The problem only appears when the engine is hot , when the engine is cool , there is no problem.

Thanks !

**gtrjerry73** · 06-08-2011, 11:13 PM

Ya my engine does the same thing purrs when cold but misses when hot I'm not too concerned about it though cause it's running perfectly otherwise. But sorry no solution from me

**markc32** · 06-08-2011, 11:27 PM

to start off the gap is too small.....

.3mm? or .3"? spark is too short and .8mm is ideal i guess? wait .3" is .7-8mm

try swapping with ignitors if u can source one out or something

2 types misfire...ignition n fuel

**bobbo** · 06-09-2011, 07:06 AM

Very simple but expensive. Replace your Ignitor. it's the silver rectangular thing on the back of your coil cover.
You can also check for codes from the ecu. I can't remember the number but it will tell you if there is an ignition system fault.
They are about $600 new or any reasonable person sells them used for under $100.00
You can also convert over to a Z32 ignitor for much less money.

**MattRose** · 06-09-2011, 08:22 AM

When you say hot, do you mean the engine is hot or that the air outside is hot? I find whenever my car sits in the hot sun for a few hours and I go to start it it will start and die instantly... Then I try again and give it gas and its fine?

**DarkCaporaL** · 06-09-2011, 08:41 AM

Originally Posted by bobbo

Very simple but expensive. Replace your Ignitor. it's the silver rectangular thing on the back of your coil cover.

In what world do you live in where the ignitor is rectangular!?

**GTRADDICT** · 06-09-2011, 09:47 AM

I had problems with my truck (see signiture) on hot days. The heat from the engine would "boil" the fuel in my holley double pumper and fuel vapor would leak in the cylinders and flood the bastard. So meaby for your guys it could be related?

Edit: Not for OP do... but it sounds like electrical. Heat activated = electrical usually

**bobbo** · 06-09-2011, 10:57 AM

Originally Posted by DarkCaporaL

In what world do you live in where the ignitor is rectangular!?

It does not have 4 sides of equal length but still has four corners that are right angles. That is a basic rectangle.
Perhaps pictures will be easier for you to understand?
http://www.bing.com/images/search?q=...le&FORM=IDFRIR
http://www.rhdjapan.com/nissan-oem-ignitor-24232

I had the same problem. Progressed to completely dropping #5 cylinder. Tried a friends, problem solved. Bought another one for $75 and the car has been perfect ever since.
I believe there is a test for it but you need an oscilliscope if memory serves.