1995 R33 Nissan Skyline Gtr

[DriftKings.com]

Hi Guys,

I hope the knowledge is plenty and flows freely here. I have an R33 GTR that i obtained recently. Everything was f'ked and i serviced everything that i could myself almost immediately after obtaining it.

Symptoms - Car Intermintently starts chugging and refuses to rev, there is no particular stage, neither hot or cold, or revs. It happens through out the whole rev range, it comes and goes and happens through all gears. Car goes through about 15 Litres of Petrol on average over 100kms. This would be 40% highway and 60% suburban driving. Last couple of fills were 45.23L for 300km & 55.21L for 355km. Is this normal consumption of petrol for RB26DETT R33 Skyline?

The things that i changed are:-

Performed 1st March, 2008

* Engine Oil - Valvoline 15-40W Synthetic (Engine Flushed Prior)

* Oil Filter - Cooper WZ442

* Air Filter - Ryco A360

* Fuel Filter - Ryco Z387

* Coolant (Radiator Flushed Prior)

* Spark Plugs - NGK Iridium IX BCPR6EIX-11

The car has always run on Caltex Vortex Premium or BP Ultimate Premium Petrol. I have also run petrol injector cleaner through.

The only other things which i have done to the car which i dont think would have caused the problem is to install new brake pads, machine brake rotors, bleed brakes. Installed HKS Type I Turbo Timer. Installed Aftermarket Stereo Head Unit. Installed Front Speakers.

Today after reading through the forums on misfiring and stalling and similar symptoms i removed the Iridium Spark Plugs and replaced them with:-

Performed 28th March, 2008

* Spark Plugs - NGK BKR6E (0.8mm gapping)

I have also read about the coils possibly being faulty, i dont know how to check these, the packs look like they're in good condition, if some one could tell me how to check them. I would get a set of Splitfires if i was certain this was the cause.

There is also the possibility of the ignitor playing up which is on top of the engine cover. What aftermarket options are available if this is the case?

Then endless talk about also Crank Sensor, O2 Sensor, Knock Sensor, AFM, etc etc... Please Help... If some one could shed some light on what it could be with out me replacing everything my pocket would greatly thank you.

I'll keep everyone updated on the steps i take and the outcome.

Cheers

Steven Thratthabeusy

[heller44]

An easy check for bad coils. Remove coil cover, wait til dark, make sure engine is warm, watch coils with engine running in a nice dark area and if your coils are arcing out you will see nice blue lightning around the base of the suspect coils.

Oil is perhaps a bit on the thick side. Nissan spec 7.5-30, I personally use 5-40 and it seems to like it.

Fuel economy, how heavy is your right foot? Are your o2 sensors working correctly? Are you pushing more than stock boost? A lot of factors affect economy. Just before mine came off the road I was getting ~220km to 45l, driving like a grandpa, rich as a pig.

Hope some of this helps.

[godzl1975]

i had a R32 GTR 92 model and when it was doing what you described was the wiring harness that goes to the ignitor there was a break in the wire somewhere there as i fiddled around there with coil pack cover.

not saying that is the cause but just n idea that may or may not help. BUt could be alot of things...AFM's? Coils? Ignitor?..if you have a friend with GTR would be handy, swap parts at a time.

GL with it all

[DriftKings.com]

heller44,

I have removed the engine cover and watched for a spark with no sucess, I shall take the engine oil into consideration in a couple of thousand kms when i do the next 5000km service on it.

My right foot is heavy, it goes down to the floor everytime i drive it. Coming from a background of drifting and owning V8's and mates with supercharged V8's, its just a bad habit. The car is stock from what i know, i am the 1st owner in Australia. The previous owner has taken pride in their handling as there are teins under it and the attesa 4WD system is still working. I dont know the layout of the RB26DETT and have no clue where to find the O2 sensor. I'll do some reading on SAU to find out to check that.

godzl1975,

As i have replaced the spark plugs a couple of times in the last month it is possible the wiring harness that goes to the ignitor has become unstable. Failing testing the coils i shall check the wires that run off the ignitor to where i can see.

It would be easy if i had a mate with a Skyline GTR so i could swap parts with to eliminate certain aspects of the problem. Unfortunately i dont.

-------------------------------------------------------------

I have had a mate who works as a technician for lexus who owns a Sil80 do some simple checks as it was in its problematic state. We took off the plug for the 1st injector which he said indicated that the 1st cylinder wasnt firing. He said to check it like this for all or check for a spark in the coil packs to diagnose which cylinders werent firing. I now know at least the 1st cylinder has problems. I also mentioned that most of the spark plugs removed had been fowled. Another technician who works for Toyota also agreed that it is more then likely the coil pack not functioning correctly as the plugs had been ruined.

As soon as daylight arrives i shall be testing the spark of the cylinders.

If its the coils then Splitfires should be ordered soon. More top end revs. From past reviews power gains are also to be had.

Thanks to all that have contributed. I shall keep you all posted to the outcome.

Cheers

Steven THRATTHABEUSY

[R33S2]

Sounds like the ignitor to me or its harness.

[DriftKings.com]

I have bought some extra coil packs to eliminate the problems. How ever it is not the coil pack which is faulty. I now know there is problems with the 1st cylinder firing. It is either the lead that goes to the 1st cylinder or the actual fuel injector which needs replacing or repair. If some one could tell me how to test and eliminate which it is that is faulty id greatly appreciate it.

If it is infact the harness the car is going to an Auto Electrician to re-wire. Any idea's on price???

More $$$, More Time, More Effort, More Headache... Why do i insist :-P

[DriftKings.com]

Hi Guys,

Are there any tests which i can perform to check coil or injector???

Thanks

[heller44]

swap bits betwwen cylinders, see if the fault moves.

[DriftKings.com]

I have narrowed it down to the 1st cylinder, how do i test whether its the lead not sparking or the injector?

[GeeTR]

Swap 1st cyl coil with another, see if fault moves. If so, its the 1st cyl coil.

If it doesn't, put coil on plug and rest on head, see if spark jumps - if so the harness and coil is good (within reason)

You could pull the 1st coil plug, and crank motor briefly- if plug is wet, inj is working.

Ha, at that stage of fuel good, coil and harness good.. well then just burn it, and start again

Why do i insist :-P

You persist cus its a GTR

Edited March 31, 2008 by GeeTR

[DriftKings.com]

Update,

I have taken the car down to SSS Automotive in Girraween after confirming he had an ignitor module for my R33 GTR. Jeff was very helpful allowing me to try an ignitor, fingers crossed i turned it on. No Luck. Still cylinder #1 not working. We then tried a spark test, sucess. This meant the injector was faulty. But then i had taken the 1st injector to get serviced this morning. It was confirmed working.

WIRING = Nightmare... ARGHHHH!!!

Jeff called on the services of Jim from next door from Sideshow's Performance Wiring who looked over the car, the problem was intermitent and painful to diagnose. We went over all connections we could that were acessible. Went to the extent of swapping out ECU's that SSS Automotive kindly lent for the diagnosis. Still the problem in Cylinder #1. Everything electrically was un-pluged and clips etc tightened.

Everything was put back together and magic. It was all working. Suspect wire was not 100% in on the ECU. It has been less then 1 hour since. I shall confirm that the problem has gone in a couple of weeks.

NEW PROBLEM - Car moves, boosts, and starts not revving after about 4100rpm. I suspect it might be fowl plugs, i shall change them after this post and keep you updated.

Thanks for all the advise and help guys.

[DriftKings.com]

okay, here is an update...

I have changed plugs to brand new BKR6E... Cheapies compared to Iridium Plugs... The problem is still there with it hesitating...

I have figured out it isnt with the rev range... But more when it his 3.5+ boost... How do i fix this problem and what is it???

Any advise would be appreciated...

[jeff]

my 33 GTR is doing the same now (currently being looked at by CRD)

have you had any luck in finding the prob?

cheers

jeff

[Amec]

the inability to rev past 4000rpm is most likely a boost leak.

[Godzilla32]

I still wouldnt rule out a misfire especially if its worse or only under load. Have to witness it to make an accurate judgement..

[superspit]

I still wouldnt rule out a misfire especially if its worse or only under load. Have to witness it to make an accurate judgement..

woah!.......UPDATES PLEASE!!!

[jeff]

mine has been sorted by CRD and it was the ignitor causing the issues

well 1st it was the o2 sensors playing up as well which may or may have not contributed to my problem? but with 13+ years of running, im sure its about time to change them anyways.

the ignitor would heat up after running the engine which is then sending the wrong signal to my 3rd coil....results to 3rd cylinder not firing properly.

[NeonKomet]

I'm glad it's not just me having probs with an R33 GTR.

My car is suffering from a similar problem, intermittent issue with throttle. Step my foot down, no reponse for about 30 seconds to a minute. Stuck on the side of the road with the indicator on and a confused look on my face.

6 months ago revving problem was caused by Air filter oil affecting AFM's. Problem was fixed.

Now a chugging sensation comes and goes and more recently the throttle condition has become more frequent.

I find the BCPR6ES-11 spark plugs work well