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Help Me Diagnose My Faulty Coil.

PIOTREK

By PIOTREK,
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PIOTREK Proficient

PIOTREK

Posted
Posted

As the topic indicated i have misfire at about 5.5k rpm and have got a second coil pack that i want to fit. However i only want to change the faulty coil. How do i diagnose which is the faulty one?

I would rather not run the car 5 cylinders red line the crap out of it

Any ideas?

Thanks in advance

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madbung Grand Master

madbung

Posted
Posted

Usually the problem is a hairline crack in the coilpack body which allows the spark to follow the path of least resistance and arc to the head. Remove coil cover, move car to a dark place, start car, get someone to rev it while you try to spot which coil is arcing out....replace.

PIOTREK Proficient

PIOTREK

Posted
  • Author
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Moodles2 can you please elaborate on your post. You saying to buy a cable and run it from the ecu to the COMP and i need the program? Where can i download/ buy the cable?

I'm not sure if it will spit out any fault codes cause the check engine light doesn't come on, it is only really mild miss fire but still need to fix it!

iseekool Veteran

iseekool

Posted
Posted

If you have an R34 - Better get a set of new coils (splitfire brand). Once one coils starts to fail the others will not be too far behind.

Best get a new set it will save you hassle especially if you drive far from home alot.

Moodles2 Grand Master

Moodles2

Posted
Posted
Moodles2 can you please elaborate on your post. You saying to buy a cable and run it from the ecu to the COMP and i need the program? Where can i download/ buy the cable?

I'm not sure if it will spit out any fault codes cause the check engine light doesn't come on, it is only really mild miss fire but still need to fix it!

This only applys if you still have the stock ECU. Your Skyline has a fuse box under the steering wheel, inside is the Consult port (aka diagnostic port). With a Consult USB cable (http://ecutalk.com/interface.aspx) you can connect a PC or laptop and read sensor values, do active tests etc as long as you have PC software like OBD ScanTech (free) or Nissan DataScan (commercial), this is a screen shot of Nissan DataScan (commercial version not the cut down evaluation version) with the page to cut off spark to cylinders, effectively disabling them.

datascanactivetest.JPG

mad082 Grand Master

mad082

Posted
Posted

the problem with using the consult method is it isn't that reliable for what he wants to find out. at idle the weak coil may be firing fine and simply switching of cylinders won't find the dodgy coil.

swapping the coils out 1 by 1 will give the most accurate results, however if more than 1 coil is failing then it won't help much.

also, before you start swapping coils around, how old are you plugs, what gap are they, what heat range and what type are they? if you plugs are getting old and worn then they may be the problem and not the coils. in my case when i had a missfire it was caused by the plugs and not the coils.

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted (edited)

far out i'm confused! lol yer well tonight i'm gonna pull it all apart and see wats happening under there :thumbsup:

Only problem is that it doesn't constantly miss! Last night on the way home it was running fine on full bost and the the red line, but the day before it was missing!

is the r33 series 1 coil pack the same as the series 2?

Edited by P1OTR
Benzino33 Experienced

Benzino33

Posted
Posted
s1 has a seperate ignitor pack (same as r32). series 2 have it built into the coils (same as r34).

Thats right, I put r32 gtr coils in mine wen I had a miss. But does that mean all rb26 coilpacks are the same? or will the r33gtr ones be like the series 2 coils?

Benzino33 Experienced

Benzino33

Posted
Posted
so in short i can't put an series 2 coil in a series 1?

nah man u cant, they simply wont ignite.there will b no connection.

series 2's hav their own igniters on each coil pack but a series one only has the one firing up all 6

Benzino33 Experienced

Benzino33

Posted
Posted
the r33 gtr coils i have seen were like the s1 and r32, but i don't know what year series gtr it was.

ah true,,how many series 33gtrs are there? and wat r the differences

Benzino33 Experienced

Benzino33

Posted
Posted
I have a set of s1 coils somewhere, what side of town are you Peter.

hey, he's mate of mine, he's down Narre side.

Ey Piotr,i got 4 good spare coils if u need, but if ur closer Madbung, go ahead

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