Gtr Losing Power/misfiring/unhappy

[No Crust Racing]

Well the plot thickens with this car... Driving today and it started misfiring and losing mass power, not just misfiring on one cylinder but totally dropping 1-2k rpm before giving me a few more splutters then dropping power again. Nursed it home (problems seem related to heat/load).

At this point I was thinking bad plugs/coil pack(s) or fuel pump perhaps. Got home let it cool down and and removed the coil cover and found that the car has Split Fire coils and NGK Iriway plugs, plugs seemed in good condition, no carbon build up, nothing cracked/broken etc etc.

So Im thinking, could it be the ignition module (Took this out of the car and cooled it down and drove again with no issues til everything was hot again) Or something timing related? (whatever it is related to heat/load for sure) or as mentioned, a fuel pump issue?

Here's some pics to help.

[Adriano]

Check trouble codes, sounds like when my cam angle sensor was dying, it was heat related, and appeared to be load dependant(it would still drive at 10% throttle, but giving it any more made it miss and die)

[No Crust Racing]

I've done that on my old 33 but not sure how to do it on this car.

[No Crust Racing]

Just found the document I had on ECU diag mode but I have an Impul Chipped ECU, I'll try it and see what happens 0_0

[No Crust Racing]

The Impul unit does not have diagnostic LED's on it at all =\ I took it apart completely and took some photos of the EPROM if that's of any use.

Edited January 6, 2007 by ActionDan

[silvercam]

The Impul unit does not have diagnostic LED's on it at all =\ I took it apart completely and took soem photos of the EPROM if that's of any use.

hey would say it is the coil packs are breaking down when they get hot so they would only run on a few cils. Happen to mine yesterday, soon as i let it cool down. start it again and runs fine untill it gets hot again am getting new coil packs that will fix my problem could be the same as mine

Edited January 6, 2007 by silvercam

[Adriano]

Really doubt its coil packs as you have splitfires and the problem doesn't appear to be only under full load. When the problem occurs, what does the tacho do, if it jumps around, id say the cas, if it doesn't, then the igniter.

[No Crust Racing]

Tacho just starts dropping as if the engine has stalled then fires a few more times so if I was at say 3k rpm I'd get nothing from the engine for another 2k rpm then it would fire a few more times etc. If I clutch in and let it try and idle it'll bounce between like 20 and 1100rpm lik it only just fires in time to keep the engine running. It's not a hunt though like the famous AAC Valve issue on GTS25T's it simply just doesn't fire.

Any idea what an ignition module is worth?

Edited January 6, 2007 by ActionDan

[blk180]

New one about $800 also died when they said that just pic up a second hand one or try someone else frist.

[No Crust Racing]

I think i might possibly have the only R33 GTR around this area =D There 'might' be one more but I don't know the guy. There's a really good mechanic out of town who apparently races GTR's I'm trying to get in touch with him for some assistance. Might get the car into tuning shop or Nissan tomorrow to see if they can give me an error code.

[Faid]

Dude get this hting checked i had this issue last week and im running big power. my CAS was on its way out, and its f**king scary when your pride joy and big parts of you savings start to sputter and drop revs. i looked like a coil related problem but when i swapped my coild to a mate's RB 26 they fires correctly, after that i tried my ignitor, same agian, bu when i checked my CAS it was shot. it didnt give the correct signal, have it checked before smth worse happens

[No Crust Racing]

Did you personally check your CAS if so how and how much was it to replace?

Cheers

[SLIPPERY]

cas are around $200 second hand if you can find one. I had to replace mine 2 months ago

[Adriano]

AFI in sydney can supply a new(or reco?)Cas for under $200 if i remember correctly

[godzl1975]

could it be the earthing wire from the ignitor??just suggestion

[No Crust Racing]

Mmm, don't think it would be as I've got it earthing to the bracket that holds and earths the col packs.

[brad_gtr]

Had a similar prob with mine , used to drop 1 pot when it got to operating temp, clean the 2 temperature sencors at front of the engine .

Good luck Brad

[No Crust Racing]

The one stuck to the side of the radiator? Will try it but my car is totoally not firing for a few thousand RPM before it will fire again, it's not just missing on one.

Trying another Ignition module tonight.

Fingers Crossed.

[fuzzy_scuz]

I had a similiar problem until I got my timing belt replaced and done 100,000km service to replace all the platinum plugs with new ones and got new coils, plus had the fuel rails cleaned.

If your in Vic Garry Rogers Nissan in Glen Waverly still service GTR's and they work on my r33 for stock stuff.

Edited January 8, 2007 by fuzzy_scuz

[No Crust Racing]

I have some new plugs on the way - I have split fire coils and I have access to some new coils I can try out. Will try that if the ignition module doesn't work.

When your timing belt was changed was the CAS touched?

Cheers