Rb26 Problem

[Mark-32]

Just need some help, I did do a search but it seems the coil pack misfires others people have are at higher rpm.

I have just got my car going after having a bent valve replaced due to broken guide.

So anyway I put the engine back in the car, everything is the same as when it was running before, besides im having to use stock coil packs and ignitor. (My split fires and ignitor that I was using before were stolen while engine was out)

Once everything was hooked up the car started first crank and idles fine, I connected the laptop to the vipec and have put a timing light on it and set it to 20 degrees which is what the vipec displayed as base timing.

As soon as i apply revs, say contantly holding it at 2000rpm it develops a miss just like a bliping stutter sort of thing. While its missing i have tried disconnecting coilpack leads one by one and you can hear it drop spark on each cylinder. All sparkplugs are good and im using the same coil harness as before.

I took it for a spin up the road and it gets worse through the rev range. All coilpacks look like new and I have had it running at night and cant see any spark jumping around either which makes me think its not the coil packs.

While the car is parked If I stab at the throttle and rev it to 3-4000 there is no miss and it sounds fairly clean, its only when i hold contant revs or its under load that is gets the stutter/misfire

There are no afm's so can anyone tell me if theres a good way to determine if my problem is the ignitor or the coil packs? I dont have access to any spare coil packs or ignitors and I rang Nissan today and got quoted $876 for new ignitor.

[R.3.2.G.T.R]

u have good earth to the ignitor? I believe someone posted an alternative ignitor here for much cheaper

[DVS JEZ]

Wat spark plugs are u using? Wat gap did u set them at. Did u check if they where cracked or any trace lines on the white porcelain.

How old is the fuel? Does ur laptop show anything odd when the miss occurs.

[Mark-32]

Wat spark plugs are u using? Wat gap did u set them at. Did u check if they where cracked or any trace lines on the white porcelain.

How old is the fuel? Does ur laptop show anything odd when the miss occurs.

The plugs are the same plugs it had in it when the car stopped and they still look fine. Think they are 10 or 11 iridiums

Injectors are brand new 800's, the quarter tank of 98 fuel in it has been there since the 21st of march to be exact... Could this be my problem do you think? And would it miss even off boost just above idle like its doing?

I just tried swapping coils one by one with another one I found- This didnt help. Plus all the coils look good with no cracks or jumping spark in the dark

My laptop didnt show anything besides all the vitals stats- and I dont really know what to look for anyway. It shows manifold air pressure and all temps but no errors come up or anything. Plus it idles perfect besides the odd little stutter which gets worse the more contant revs you apply.

I spose next step is to put some new fuel in, new spark plugs and try get another ignitor to try. And then chase my tail some more.

Anyone have any other suggestions?

[R.3.2.G.T.R]

yup new fuel needed

[DVS JEZ]

try the easy and cheap options 1st,

new fuel new plugs and if you can borrow a mates ignitor.

other than that get it on a dyno so they can see what the air/fuel mix is doing