Jump to content
SAU Community

Missing On And Off....

Angr33_Sparcorella

By Angr33_Sparcorella,
in Western Australia

 Share

Recommended Posts

Angr33_Sparcorella Community Regular

Angr33_Sparcorella

Posted
Posted

Help!!

My RB20 Cefiro has been missing/running on 5cyl for about a month now on and off, more when the engine is warm. I originally bought it with a miss, replaced a coilpack and it worked fine. But then the problem has came back; its in cylinder 6 (closest to firewall)

List of things i've tried:

-Changed the coilpack

-New spark plugs and re-gapped

-Replaced the coilpack loom

- Borrowed an ignitor from a running RB20

- Re-wired/Re-earthed the coilpack loom earths

- Pulled injectors out and put them back in (made car idle lower then back to normal)

- Tried a bigger battery

- ECU Diagnostic check - code "55" = All Ok

- checked all coilpack wires from ignitor to ecu

I also checked the spark and cylinder 6 has a very weak spark and cylinder 1 has a very strong spark, what causes this?

So now i'm running out of ideas. Am thinking about borrowing an rb20 ecu and maybe doing a compression check, just to rule that out.

Any other ideas would be greatly appreciated.

Thanks,

Dani

Link to comment
https://www.sau.com.au/forums/topic/303317-missing-on-and-off/
Share on other sites
gazza750 Veteran

gazza750

Posted
Posted

air flow meter intermittent fault

try a diff afm or give yours a hard knock and see if that changes anything.

Your problem sounds exactly like my gtr until i got new ecu and got rid of the afm's

Nic_A31 Grand Master

Nic_A31

Posted
Posted (edited)

How does Air Flow Meter affect only one cylinder ?

If it was related to air flow correspondence and only on one cylinder, the fault would be between the ECU and fuel injection/ignition, not between AFM and ECU.

Edited by Nic_A31
Angr33_Sparcorella Community Regular

Angr33_Sparcorella

Posted
  • Author
Posted (edited)

Cleaned afm and everything looked normal and still no change :(

A friend has sourced an ecu, gonna try that iether tonight or tomoro night.

Will keep an update, for future readers :P

Edited by Angr33_Sparcorella
Neuroglider Mentor

Neuroglider

Posted
Posted

did you swap a coil pack or all of the coil packs?

i had what your saying (engine light also came on and proceeded to sound like a wrx)

cept i changed all my coilpacks to splitfires and regapped to 0.8 with iridium plugs

works beautiful now...

maybe take it to a mechanic to see if they can source the problem?

Angr33_Sparcorella Community Regular

Angr33_Sparcorella

Posted
  • Author
Posted

i've had a mechanic working on it for the past three days lol, i swapped the missing cylinders coilpack with a working one and still remained in cylinder 6 which means its not the coilpacks.

Well, i think we found the problem. We took the plenum top off and replaced the gasket goo (gasket looked fine) and worked ALOT better, but the miss was still slightly there. We then relised we'd snapped a bloody vacuum hose.

So will replace that and i'll still test the ecu just to make sure its not playing tricks on me.

Fingers crossed the hose fixes the problem.

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

    • xmanz
      Video Edit Programs

      By xmanz · Posted

      When I need something else to edit, I use Movavi. A friend who does video editing on a daily basis recommended me) it's an easy video cutter to use for beginners
    • Skidmore
      Video Edit Programs

      By Skidmore · Posted

      I need to edit some videos for work but I'm not good at all this. Which video editor can you recommend?
    • GTSBoy
      HY51 Fuga Hybrid

      By GTSBoy · Posted

      I think you're really missing the point. The spec is just the minimum spec that the fuel has to meet. The additive packages can, and do, go above that minimum if the fuel brand feels they need/want to. And so you get BP Ultimate or Shell Ultra (or whatever they call it) making promises to clean your engine better than the standard stuff....simply because they do actually put better additive packages in there. They do not waste special sauce on the plebian fuel if they can avoid it. I didn't say "energy density". I just said "density". That's right, the specific gravity (if you want to use a really shit old imperial description for mass per unit volume). The density being higher indicates a number of things, from reduces oxygen content, to increased numbers of double bonds or cyclic components. That then just happens to flow on to the calorific value on a volume basis being correspondingly higher. The calorific value on a mass basis barely changes, because almost all hydrocarbon materials have a very similar CV per kg. But whatever - the end result is that you do get a bit more energy per litre, which helps to offset some of the sting of the massive price bump over 91. I can go you one better than "I used to work at a fuel station". I had uni lecturers who worked at the Pt Stanvac refinery (at the time they were lecturing, as industry specialist lecturers) who were quite candid about the business. And granted, that was 30+ years ago, and you might note that I have stated above that I think the industry has since collected together near the bottom (quite like ISPs, when you think about it). Oh, did I mention that I am quite literally a combustion engineer? I'm designing (well, actually, trying to avoid designing and trying to make the junior engineer do it) a heavy fuel oil firing system for a cement plant in fricking Iraq, this week. Last week it was natural gas fired this-that. The week before it was LPG fired anode furnaces for a copper smelter (well, the burners for them, not the actual furnaces, which are just big dumb steel). I'm kinda all over fuels.
    • LjB123
      RB25 Crankshaft Differences

      By LjB123 · Posted

      Well my freshly rebuilt RB25DET Neo went bang 1000kms in, completely fried big end bearing in cylinder 1 so bad my engine seized. No knocking or oil pressure issue prior to this happening, all happened within less than a second. Had Nitto oil pump, 8L baffled sump, head drain, oil restrictors, the lot put in to prevent me spinning a bearing like i did to need the rebuild. Mechanic that looked after the works has no idea what caused it. Reckoned it may have been bearing clearance wrong in cylinder 1 we have no idea. Machinist who did the work reckoned it was something on the mechanic. Anyway thats between them, i had no part in it, just paid the money Curiosity question, does the oil system on RB’s go sump > oil pump > filter > around engine? If so, if you had a leak on an oil filter relocation plate, say sump > oil pump > filter > LEAK > around engine would this cause a low oil pressure reading if the sensors was before the filter?   TIA
    • sonicii
      HY51 Fuga Hybrid

      By sonicii · Posted

      But I think you missed mine.. there is also nothing about the 98 spec that supports your claim..  according to the fuel standards, it can be identical to 95, just very slightly higher octane number. But the ulp vs pulp fuel regulations go show 95 (or 98), is not just 91 with some additives. any claim of ‘refined by the better refineries’ or ‘higher quality fuel’ is just hearsay.  I have never seen anything to back up such claims other than ‘my mate used to work for a fuel station’, or ‘drove a fuel delivery truck’, or ‘my mechanic says’.. the actual energy densities do slightly vary between the 3 grades of fuel, but the difference is very minor. That said, I am very happy to be proven wrong if anyone has some hard evidence..
×
×
  • Create New...