Jump to content
SAU Community

Recommended Posts

  • Replies 72
  • Created
  • Last Reply

Top Posters In This Topic

as unlikely as it sounds but a broken ringland/piston can cause a miss under load.

whats ur fuel pressure regulator like?

a flogged out dirty catalytic converter also can cause problems.

this happened to me , i had a dry solder joint alomg my loom , midway along it too mind you , absolute prick to find.

could be that

Hi I am new in the forum and I have the same problem. My car is R33 GTS-T 25T Series 1 Auto. I recently increased boost to 12 pounds and started to experience misfire only at full throttle (the car has a pod filter, cat-back 3" exhaust, Unichip, bleed valve and standard everything else).

I took my car to Nissan yesterday and fitted a new set of standard heat range 6, NGK Platinum plugs (previously Greddy Iridium, heat range 7), which improved the misfire problem a bit. However, idle rev has gone up from 660rpm to 760rpm.

Any thoughts will be much appreciated.

Gday Kymmy!

sounds like over fuel for sure...

same rev range same boost range...

yeeeeep

Originally posted by Strich9ine

Cheers guys,

Well, I'll just wait until the AFC is in and tuned, and if it still does it, i'll be looking at the AFM.... daym!

Maybe it's better to go for a Z32 AFM ? How much are they in comparison to a stock AFM ?

crooser,

By single misfire, i mean, it gives about 3-4 big pops consistantly between 4000rpm and 5000rpm.. then power comes back on after 5000 and it runs fine till redline...  

so frustrating...

  • 4 weeks later...

After a full major service today thinking my misfiring/poping would disappper has not helped.

i ran 14psi on my r33 series 1 at 4000 - 5000 rpm she would misfire bad. I got a pod, highflow cat, 3'' exhaust system and a custom fmic. As a result i have to run the factory boost level to avoid this problem.

Anyone got definate solution to this nightmare we are all having.

Well heres my plan of attack in the next few weeks and will update this post with results.

1. Coils (another pair)

2. SAFC

3. Z32 AFM

4. Electronic boost controller (I might have a faulty bleed value_

If it doesnt get better im gona go nuts. any comment welcome as im runnng out of ideas

Thanks in advance

AK

As a last ditch effort, look at higher energy ignition.

I admit I know nothing about MSD type units - in fact I was surprised to see someone on this forum revert back to a VL style "distributor cap and 6 wire" type setup.

However some people have gone to Splitfire D1 coils and this solved their problem.

But they aren't cheap.

T.

Has anybody thought that maybe it may be a faulty injector/dirty injector??? An injector could be dirty and staying open a little possibly and causing overfueling in a cyliner. One of my plugs was blacker than the rest so im getting my injectors checked.

HI WLD747, have you got a boost cut defeater? We have 700 bhp RB's running 1.5 bar with standard ignition, I don't think you need to look at upgrading.

Have not read the above threads so maybe i should keep my mouth shut but I like almost everybody on this forum have had flat spots like you!

I started a thread: http://www.skylinesaustralia.com/forums/sh...&threadid=23922

and got lots of suggestion most of which were fuel related!

All r33's are going to get a small flat when the cam changes position around 4500 revs. And a fuel modifier like a s afc or something should fix that. But if you are getting really bad ones then you should not rule out the air flow meter, ignitor pack or spark gap...

Spark gap has probably been suggested already but I had somebody change my gap from .80 to .76 which totally fixed the problem, so even the slightest change in gap can make a difference. I should also mention that I am running NGK iriduims.

Have a look at the link above there might be some suggestions there that could also help you!

Have not read the above threads so maybe i should keep my mouth shut but I like almost everybody on this forum have had flat spots like you!

I started a thread: http://www.skylinesaustralia.com/forums/sh...&threadid=23922

and got lots of suggestion most of which were fuel related!

All r33's are going to get a small flat when the cam changes position around 4500 revs. And a fuel modifier like a s afc or something should fix that. But if you are getting really bad ones then you should not rule out the air flow meter, ignitor pack or spark gap...

Spark gap has probably been suggested already but I had somebody change my gap from .80 to .76 which totally fixed the problem, so even the slightest change in gap can make a difference. I should also mention that I am running NGK iriduims.

Have a look at the link above there might be some suggestions there that could also help you!

Sump Baffels? Wtf?

Anyone had the ignition module (black box on top of the engine) die on them?

I've got similar engine skipping problems, and after trying everything else, I'm thinking that may be the cause

rev210 is right the problem is ignition.

This fix has worked on 3 out of 4 cars that I have tryed it on including mine and hitnrun's cars,

Croosers car being the one that it didnt work for (he had a stuffed Afm).

Advance the ignition timing from 15 deg to about 22 deg. no more than 25 deg and then reset the ecu.

Regards

Damqik

Gunmetal has the right idea and I second his post re: .74mm gap with stock ECU on upped boost. check this thread, I just went thru the same BS and sorted it.

http://www.skylinesaustralia.com/forums/sh...5648#post555648

wishing you a speedy recovery !

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...