Changing Spark Plugs!

[dru32]

Can somebody please give me the steps in changing/checking spark plugs.. I want to know what to look for also.. The reason being is my car is missfiring. Also what should I replace them with if needed?

Thanks,

[nismoman18]

i know how to get the cover off and everything, then there are coil packs on top of each spark plug ? what do i do to get these off? I think you should replace them with like iridiums or NGK spark plugs, factory gap is 1.1mm but lots of line owners seem to regap to .8mm, at what rev range is it misfiring?

[dru32]

it missfires from about 4,000 all the way through.. And it is preety bad too!!

[nismoman18]

try like reseting ECU and if its still doin it maybe u should get a mechanic to look at it eh

[dru32]

how do u reset the ECU

[nismoman18]

u disconnect the battery and press the brake pedal for a few minutes to make it totally powerless, if uve got an alarm system u will have to turn it off or just let it go off from the back up battery like i did. If u really want to drain the power leave the car for a whole day disconnected (sourced from http://www.powerlink.co.nz/~graeme/faq/). Reconnect and then start, the ecu will do a diagnostics and advance timing till it has a knock then it will retard so its perfect. I did it on mine but i didnt do it properly cos my alarm was goin crazy so i just reconnected and wil do later

[dru32]

thanks!

[dru32]

Soo... How do you check the spark plugs, ne guids newhere?

[dru32]

also how do you gap them?

[nismoman18]

im trying to work out how to get them out of the block, i pulled the plastic cap off and found that each plug has its own coil pack, isnt that cool, but how do i get them off without breaking sumthing. There are charts which u can prolly get from supercheap or sum mechanical place which shows damaged sparkplugs compared to a good one, and gapping them u should get a feeler gauge ($10) and just tap them gently till the gap is at .8 which is what ppl seem to like. the feeler gauge is to measure the gap, do not use a hammer or pliers, and iridium plugs shouldnt be regapped too apparently

[DREMEN]

OK i did mine 2 weeks ago so I know the process......

-Once you have removed the NISSAN cover, undo the electrical plugs (one for each spark plug)

-Take off the plug (just pulls off)

-The you will be looking at the top of the spark plug.

-In your socket set you will have a really big socket (i forget the size) and use the extension arm, put this socket over the spark plug and undo.

- Be careful not to drop anything into the whole (do 1 plug at a time to avoid dropiing anything down there)

- Get the new spark plug, screw it in (VERY TIGHT)

- Put the plug back on

- Continue.

:D hope that helps

[rwong20012]

http://homepages.kcbbs.gen.nz/benk/gtst/Fi...ndplugmaint.htm

I did my spark plugs last week for my r33 gts25t

i just followed the instructions of the web page above.

BTW don't tighten the spark plugs too much and not to leave them too loose. read up about it on www.ngk.com.au they tell you everything about them.

But for the R33 spark plugs NGK (BKR6E11) just normal copper ones B = Thread length 14mm for this length the tightness of the spark plug recommended by Ngk was HAND tight then with the socket wrench another 180degrees of a circle..

Changing the spark plugs helped me solve the miss firing problem which occured for me at above 4000rpm but my spark plugs needed replacement coz they done like 15000km for copper that it

=)

being

[blind_elk]

Originally posted by DREMEN

OK i did mine 2 weeks ago so I know the process......

-Once you have removed the NISSAN cover, undo the electrical plugs (one for each spark plug)

-Take off the plug (just pulls off)-The you will be looking at the top of the spark plug.

What about the 12mm headed bolts that hold the coilpack framework down on the sparkplug?

-In your socket set you will have a really big socket (i forget the size) and use the extension arm, put this socket over the spark plug and undo.

Use the right spark plug socket!

- Be careful not to drop anything into the whole (do 1 plug at a time to avoid dropiing anything down there)

- Get the new spark plug, screw it in (VERY TIGHT)

NOT very tight at all, NGK recommend about 25 ft/lb torque when the head is cold (and that's not a lot of torque)

- Put the plug back on

- Continue.

:D hope that helps

While you have it all apart, clean off the rubber boots on the coilpacks, make sure there's no carbon or moisture or stuff hanging around, as that can provide an easy path to earth for the spark pulse.

[DREMEN]

doh

[nismoman18]

gee thats a heap of info, really useful too, will do my sparks on wednesday

[dru32]

yeh heaps of info.. But now it looks harder than i thought it would be... Atleast now i will have more idea of what im doing..

Thanks Guys!

[DREMEN]

Its a bitch of a job cause you have to remove the cover which has the piping over it

[dru32]

Ohh i dont mind that.. i take that off atleast once a week to polish the cams and stuff.. I did the rocker cover yesterday.. Looks V neat. I thought it was plastic stuff on top until i scratched it.. But looks good now, just need to do the right cam and the plenum now

[dru32]

hey i reset the ECU.. AND Oh yeh!!!, NOT ONE missfire!! I went to 7100rpms in first and second.. Sounds great without that annoying noise. Also it handles a bit different too.. Better actually.

If it starts to missfire again in sayyy a 2 months, is it safe to reset the ECU again?

[nismoman18]

yeah reset it as many times as u want i guess, its just like resetin ur computer at home, its just age that gets it really