Missing On And Off....

[Angr33_Sparcorella]

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

[gazza750]

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]

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 January 10, 2010 by Nic_A31

[Angr33_Sparcorella]

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

Edited January 11, 2010 by Angr33_Sparcorella

[2dabass]

leeds mixed up the wrong wat round? acctual coil pack f..ked try swaping coil packs

[Neuroglider]

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]

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.