R34 Gt Ignition Problem

[durty 4]

Hey all,

New to the forum but have been a long time lurker.

Have been faced with a strange problem on my 1999 R34 GT. Sometimes when ive been starting the car the MIL (engine check light) comes on and the car tends to shake a bit more than normal, noticing this i realised that it runs on 5 cylinders instead of 6 when it lights up.

However the light will only light up once or twice a week and the car runs fine (all 6 cylinders working) whenever I happen to start the car and the light does not show up.

I managed to get the ECU scanned recently when it lit up and the error code 21: Ignition Signal Circut came up.

Is it likely that this is due to a faulty coilpack or related to the crank angle sensor?

Has anyone else had a problem similar to this?

cheers

matt

[666DAN]

Most common R34 problem in the world, replace the coil packs as they all die eventually and you'll be running on less and less cylinders until it won't go.

I don't know of a single R34 that has not had this issue.

[jrm]

*knocking wood* mine hasn't yet.

[dori34]

+1 for coilpacks letting go.

upgrade to some superspark/splitfire/JJR etc,

make sure they give warranty

[durty 4]

ahhh ok

looks like ill have to cough up for a new set of coils.

Will check out the brands u mentioned

cheers

[James Kelsey]

Just a word on this: I went a cheapo route and just bought one new Nissan coilpack before I learned about those coilpacks and regretted it. I ended up having to go back and buy a full set of 6 Splitfires. Haven't had a problem since... and now I'm having the same problem on the "new" 25GTt I just bought - need to go tomorrow and buy another set. :cry:

[skylinelova07]

Hey matt, I had this problem when I was helping my brother switch engines in his Datsun 1600. We were running on 3 cylinders instead of four. This was due to both electrical problems but we also found out that we had a couple of vacuum leaks which of course does not allow enough pressure for the pistons to work properly. However, from the sounds of things, it seems that your problem may be electrical (coils).

Good Luck with it.

Luke.

[N-DAWG]

Splitfires

[R34 -_-]

iv replaced all my coils about 8,000ks ago and now im getting a missfire in the low rev range while cruising, but the check light DOESN'T come on like it did with the faulty coils. spark plugs maybe?