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Rb26 Misfiring On Boost

Turbz_13

By Turbz_13,
in Engines & Forced Induction

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Turbz_13 Experienced

Turbz_13

Posted
Posted

I know this could be 1 of 1000 things.

but i was wondering if someone could point me in the right directions as to sort this issue!

Basically, the car has not really been driven for a long time. Finally iv got the car back on the road. changed plugs and oil and filter. Took it for a drive and it was running fine. Til i started to roll on the boost, it was as if it was ignition cutting(like on the rev limiter would. just my description of the issue)and when i backed off it started to back fire big, i guess burning the unburnt fuel.

im gonna start with the igniter module, check a few sensors and the grounding.

i was told it may possible be a dud injector leaking internally into the rail then into that cylinder once backed off??? i didnt really understand the description properly that i was given on this

any help would be greatly appreciated!! cheers guys

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Turbz_13 Experienced

Turbz_13

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coils are around 35g km's old and are split fires. i will check them but iv been told they should be fine. but ill still check of tracking marks etc...

the car was off the road, 1, i lost my license 2, i blew a stock intercooler hose and was waiting for replacement and 3, the clutch was starting to slip once it had warmed up so i wasnt using it. No mods or anything

Nee-san Grand Master

Nee-san

Posted
Posted

Very Similar situation,

Car was offroad for a long period (although regularly run) and now starts to splutter and misfire at approximately 4500RPM (boost) Have changed plugs and check the splitfires (which are quite new around 10000km old)

Any suggestions ?

Rolls Grand Master

Rolls

Posted
Posted (edited)

Are the plugs old? Could have been sitting in oil/fuel/water all that time for whatever reason fouling them. Though if it was oil or water you probably have bigger issues, possible a very very small leak could have covered them in that time though. Also if it was very hard to start first time you could have fouled them running rich.

Definitely sounds like a spark issue, I'd look at new properly gapped (0.8mm) plugs first, if the coils are new this shouldn't be an issue, next is is there water in the valley? condensation on any of the ignition components?

edit: If the intercooler hose blew it probably ran rich as shit fouling the plugs. The other thing is are you sure you fixed it properly? As a boost leak causes similar symptoms, stalling, missing, blowing dickloads of black smoke when going on to boost.

Edited by Rolls
Beer Baron Grand Master

Beer Baron

Posted
Posted

since you just changed the spark plugs and now have this issue that's where I'd be looking. check they are the correct type and heat range and that they are gapped appropriately for your set-up.

Nee-san Grand Master

Nee-san

Posted
Posted

Hey guys, Sorry to drag this back up,

Have checked the following and it is still blowing out spark albeit at around 5500 now rather then 4500

Splitfires

Ignitor

plugs, changed AND gapped

removed and cleaned AFM and tightened all plugs (voltages all read correct)

Removed inlet piping and re-tightened hose clamps (helped somewhat) still wont run more then 0.5 bar though.

What about gaskets on the turbo compressor outlets to twin turbo pipe, these two are a bit suspect.

any ideas boys ?

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