Jump to content
SAU Community

Under Load Misfire Problem

Caaal

By Caaal,
in R Series (R30, R31, R32, R33, R34)

 Share

Recommended Posts

Caaal Rookie

Caaal

Posted
Posted

Hello, SAU

I'm after some help regarding my stock 1995 Nissan Skyline S1.5 ECR33 GTS-t.

I was having a misfire problem and finally diagnosed that it was being caused by a failed injector (no. 1). It turns out the previous owner had set the injector duty cycle to 100% on stock injectors via the PowerFC. This of course destroyed the injector and leaned out the engine; thankfully it didn't totally destroy itself. After sending my injectors away to be reconditioned I reinstalled them. I was sure to clean to fuel rail as well. I also swapped out my PowerFC with a stock ECU as well as checking the coilpacks. Coilpacks were all firing nicely even at high RPMs.

Upon getting the car started I took it for a drive around my street after letting it warm up for about 15 minutes. It idled perfectly, but when I opened it up it misfired chronically above 4K RPMs. Parked it back up and checked to see if all the injectors were working. All were clicking nice and fine except for cylinder 5's injector which would stop clicking above 4K RPM. I'm at a loss at what to do because these injectors were just reconditioned and the plugs are all clipped in properly.

Was thinking that the problem could possibly be grounding as the battery has been relocated to the boot and the main ground for it in also in the boot. I've also checked and scuffed up all the grounds inside the engine bay.

Has anyone experienced this kind of problem before and maybe point me in the right direction. I'm new to the import game

Any help would be much appreciated

Link to comment
https://www.sau.com.au/forums/topic/446941-under-load-misfire-problem/
Share on other sites

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

    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      The old manifold was quite under the GTR strut brace.  The new manifold is quite [unknown] the GTR strut brace. The GTR strut brace was needed to clear the bonnet vents. The Old strut brace will almost certainly clear the new manifold, but not the bonnet vents. The old strut brace will almost certainly clear the new manifold, and the new bonnet without vents. But I am hoping the GTR strut brace clears the new manifold :p
    • The Bogan
      Mistakes were made, my R34 Story

      By The Bogan · Posted

      Bonnet clearance?
    • joshuaho96
      Magnetic Drain Plug Snapped in Half

      By joshuaho96 · Posted

      On the bright side, at least you knew that it happened and remedied before anything happened. A friend of mine just took his Fiat 124 to a shop for an oil change and they didn't tighten the oil filter housing properly. 4.5 quarts spewed out and even after refilling + tightening the cap the engine has a tick now.
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      So, more pain. The FAST manifold is a little larger than the stocker. This is problematic because there really wasn't much clearance to begin with, so going from 'barely enough' well into 'no' is sad based on the external dimensions of the thing, even though where it bolts to the head is the same. Result is the fuel rails sit a good 25mm higher, and this is a bit of an issue with the wiring that runs behind the motor, and the fuel lines, and everything else. When pushing the manifold on, it required a huge amount of force to crush wiring looms to fit it, sensors like the MAP sensor are about 1mm from the firewall, and the FPR just has to bend ABS lines to be forced into place. After some brainstorming and some sad drinking, the loom for some reason ran from the grommet behind the ABS sensor, then to the driver side head, then back to the passenger side head. So all of this was pulled back and stripped, a few wires cut and rejoined, so that the 'branch' was now on the passenger side's head as below: Before you basically couldn't see anything behind the driver head. This is much improved! The MAP sensor is now pointing up (instead of at the firewall) Brackets have been made up for the rail. The rails are for a LS1, the manifold is designed around a LS2 as it's base. Which of course has slightly different bracketry and water pump clearance, hence the mods people need to do. Should be hopefully mounted tonight. I spent money on a new FPR that is slightly more compact than my Turbosmart FPR1200. The gauge has also been moved to the rail. There's also apparently an ORB to AN Union instead of the adapter, because the ~25mm of the current adapter is going to make the difference. Provided this all goes together and arrives today, it'll be the totally not stressful attempt to start it.
    • GTSBoy
      Finding E-30 & E-85 in Sydney

      By GTSBoy · Posted

      This seems like a pointless exercise. There is no E30 availability. Ongoing availability of E85 should not be assumed. Flex-fuel is the only sensible approach, so you can use E85 when and where you can get it, 98 when that's al you can get, and anything in between as you fill it up and drain it down. And if that means replacing the pumps, fitting a flex capable sensor/ECU/whatever has to be done to these Renault shitboxen, then.....so be it?
×
×
  • Create New...