Jump to content
SAU Community

Need Help: Engine Malfunction

34GT

By 34GT,
in General Maintenance

 Share

Recommended Posts

34GT Rookie

34GT

Posted
Posted

hey guys, i hope someone can help me with a little problem ive got.

Late last week is was driving up to an intersection and all of a sudden engine malfunction light came on and started to run on 5 cylinders.

I then got an engine diagnosis done and showed that it was an ignition problem and a break down in the 2nd cylinder.

First check that i did was removed plugs and coil packs and inspected both, spark plugs were in good condition and coils worked good. The way i checked was to crank the motor over whilst placing the plug and coil to the rocker cover in which produced a blue spark, this showed all was fine.

I then checked the resistance of all the coils and all where within spec.

I then changed the spark plug in 2nd cylinder with a new one just to make sure and still had the same outcome of running on 5 cylinders.

I then removed one by one the injector plugs to see a difference in quality of running, by doing this every time i pulled an injecter plug off it would worsen except for the dreaded 2nd cylinder where it just stayed the same.

Note: When cold it runs fine on all 6 cylinders for about 30 seconds and then the malfunction lights comes on and starts breaking down.

This morning i started the car and for some unknown reason i decided to hold the revs at 2grand, it ran good for a further minute until i released my foot and let it idle, it then dropped 2nd cylinder again. It continuosly runs on 5 cylinders, never better never worse, it feels like a datsun sunny ha ha.

Ive got it booked in at nissan on tuesday but if anyone has anymore ideas on what i could do, it might save me alot of money that i dont have.

Regards

Eli

Link to comment
https://www.sau.com.au/forums/topic/230621-need-help-engine-malfunction/
Share on other sites
tridentt150v Grand Master

tridentt150v

Posted
Posted

If you didn't get any reaction when you disconnected the injector, I'd have to say you have a dud injector, pretty obvious.

Try swapping injectors and see if the problem moves with the injector, that would tell you for sure.

34GT Rookie

34GT

Posted
  • Author
Posted

ok so decided to try the injector idea, ive included photo's of where im up to and ive undone the 2 bolts at either end of the fuel rail, im just not sure where to go from here, also taken the clips off the injectors, does the fuel rail just pull away from the motor with the injectors attached???

Cheers

Eli

post-45454-1217672414_thumb.jpg

post-45454-1217672478_thumb.jpg

post-45454-1217672506_thumb.jpg

34GT Rookie

34GT

Posted
  • Author
Posted
You might have a break in the wiring to Injector#2. Try jiggling the plug and loom for #2 (after you put it all back together!)

hey guys thanks for the tips but, i worked out what it was.

By looking for the problem in the injector because of symptoms, i overlooked swapping the coil pack into another cylinder as it was sparking outside of the cylinder so i assumed it worked.

After doing the injector test in another cylinder which didnt do anything i decided to also change the coil pack to another cylinder, this i found was the problem to begin with as it then changed the miss to that cylinder.

So as of tomorrow i will be ordering a new coil as i dont trust a used one as im gonna do some fairly big trips next week and week after.

Ive lost count of how many times ive pulled the intake off in 2 days, im just glad ive finally found the problem.

Regards

Eli

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By GTSBoy · Posted

      No. Turbo shuffle and surge/flutter are not the same thing. Specifically, on a GTR, turbo shuffle has a definite meaning. On a GTR, the twin turbos are assumed to be the same thing and to operate the same way, exactly. In reality, they do not. Their exhaust sides are fed and exhaust a little differently, to each other. Their inlet sides are fed and exhausted a little differently, to each other. Consequently, when they are "working" they are often at slightly different points on the compressor map compared to each other. What this means, particularly when coming on boost, is that one of them will spool up and start producing extra flow compared to the other, which will put back pressure on that other compressor, which will push the operating point on that other compressor up (vertically). This will generally result in it bumping up against the surge line on the map, but even if it doesn't, it upsets the compressor and you get this surging shuffle back and forth between them That is "turbo shuffle" on a GTR. It is related to other flutter effects heard on other turbo systems, but it is a particular feature of the somewhat crappy outlet piping arrangement on RB26s. There are plenty of mods that have been attempted with varying levels of success. People have ground out and/or welded more material into the twin turbo pipe to try to prevent it. Extending the divider inside it works, removing material doesn't. There are aftermarket replacement twin turbo pipes available, and these exist pretty mush purely because of this shuffle problem.
    • Duncan
      Leaking Rear Subframe Bushing?

      By Duncan · Posted

      You can temporarily* use lock collars to keep it in place until you can do the bushes, back the nuts off, slide them in, snug back up. *temporarily is often for ever
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      Thanks for the quick reply. To be clear, when you say turbo shuffle do you mean turbo flutter "stustustu" or referring to something else? I had thought they were the same thing. When I wrote the post my intention was to say it wasn't a flutter/compression surge sound. My understanding was that a flutter sound would be occurring when throttle is released, whereas I can keep the throttle in the same position for this noise
    • GTSBoy
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By GTSBoy · Posted

      Yeah it does.
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      Hi everyone, I've been wrestling with this for a while now and have been trying to find out the cause. For context, the turbos used are Garrett 2860 -5s, the BOV is a BNR32 HKS SSQV IV kit, the car is currently tuned to ~470 whp on 17.5 psi. The car drives normally, pulls well when it doesn't happen, and I can replicate it fairly easily. It does not sound like turbo shuffle or flutter. The engine has only a thousand or so miles and has had this behavior since it was completed. After my engine was built for my R32 GTR, I noticed that the car now sometimes makes an air discharge sound on what appears to be positive boost pressure that sounds really similar to a BOV. I had thought that it was a BOV issue but even when replacing it with a brand new unit, the sound persisted. It seems like it's coming from the passenger side but I may be mistaken. The closest scenario I could find was this post here https://www.gtr.co.uk/threads/maybe-a-boost-leak-opinions.147955/https://www.gtr.co.uk/threads/maybe-a-boost-leak-opinions.147955/ started by @yakshii and it sounds very similar. As in, at partial throttle once I reach positive boost I begin to hear the same psh psh psh psh psh sound like air is leaking somewhere when I keep the throttle in the same position. It most commonly happens in 4th gear at around 3-3.5k RPM and 5th gear around 2.5-3k RPM, which seems to coincide with normal positive boost thresholds. It might be similar to what @Austrian GTR mentioned about his own HKS SSQV. Notable difference would be that when he applies more throttle when it happens, it stops. In my scenario if I apply more throttle during this repeated psh psh psh sound, the cadence of the sound gets faster and louder rather than stopping. If I lift off slightly and apply throttle again, it will normally stop and pull without issue. I've checked all rubber couplers to ensure that they are tight, but have not gotten the opportunity to properly do a pressurized boost leak test. If anyone has had similar experiences or thoughts on what might be the cause, I'd be very keen to hear them. I also have a video of it happening from inside the cabin, if that would make it easier to understand: https://youtu.be/2zqZXcx8jbA
×
×
  • Create New...