Rb20 Misfiring/stalling/rough Idle

[SLEEPA31]

Hey guys,

back again as another problem arises..

Yesterday i was driving to work and hit full boost along came a pop/bang sound.

Now the car misfires very badly and has a very very rough idle and most times it would stall when it does rev heaps of black smoke (unburnt fuel) comes out.

Checked AFM plug & CAS plug both of them are on firm.

Even swapped over Fuel Pumps but no luck in solving the problem.

Now this does sound like a coilpack problem so tested each coilpack. 2-6 makes the misfiring more worse but coilpack 1 sounds like it doesnt make a difference when disconnected.

Before i go swapping coilpacks from my mates car is there any other solution?

Also when i press the accelerator it doesnt want to rev instead it wants to die out. This part doesnt sound like a coilpack problem moreso fuel related right?

Thanks

[blind_elk]

Now this does sound like a coilpack problem so tested each coilpack. 2-6 makes the misfiring more worse but coilpack 1 sounds like it doesnt make a difference when disconnected.

Before i go swapping coilpacks from my mates car is there any other solution?

First off, swap your own coil packs around (eg, 1<->2) to determine if it's the coilpack itself, or something else like an injector.

Pull the spark plug to make sure it's still ok.

[SLEEPA31]

Thanks for the reply if i swap my own coilpacks over wont it still sound the same but different cylinders?

[SLEEPA31]

well i thought i had solved the problem but turns out i was wrong.. i originaly thought it was the afm because i unplugged it while the car was running and it went in to limp mode, once i plugged it back in it started to run like shit again. i bought a new one and fitted it but still have the same problem.. any suggestions woould be appreciated.

[OMGGTR]

Mate if you were driving and u herd a bang.... and all of a sudden ur cars blowing black smoke ... does it cross your mind you may have a f**ked head gasket? or something "mechanical" not electronical / sensor problem ?

[MBS206]

If it's blowing black smoke, it's not a head gasket.

Sounds like a cooler pipe or a vacuum line somewhere just toasted itself. Hence, the unplug the AFM and it wants to run okay.

[Pal]

definitely a cooler hose. done mine at a driver training course, sounded exactly like what happened. blew off twice on the way home too.

[OMGGTR]

If it's blowing black smoke, it's not a head gasket.

Sounds like a cooler pipe or a vacuum line somewhere just toasted itself. Hence, the unplug the AFM and it wants to run okay.

wasent refering the black smoke to gasket was just a random suggestion .... if u read it properly...

[SLEEPA31]

thanks for the feed back guys, i will be pulling apart the cooler pipes and re fitting them to see if i have any split joins and will search again for any vacume lines which may have come loose.. i will post up the results..

and if anyone needs an rb20 afm green label i have a spare lol.

[jjskyline79]

Check the intercooler pipeing

i had a almost the same thing happen once

hit full boost bang black smoke bugger!!!!

turns out the cer clip on the bottom intercooler pipe popped off

slipped it back on and replaced it with a j clip and problem solved

this was on a R33 mind you

[SLEEPA31]

finally fixed it.. feel abit stupid but yes it was the bottom intercooler pipe..just slipped out the bottom by 5mm which was enough to cause such a big headache..

still missfires abit but i think the plugs could have fouled up from running it so much.. i tested all the coilpacks and they are all working fine, so thanks heaps guys.