Jump to content
SAU Community

Rb20 Misfiring/stalling/rough Idle

SLEEPA31

By SLEEPA31,
in Engines & Forced Induction

 Share

Recommended Posts

SLEEPA31 Explorer

SLEEPA31

Posted
Posted

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

Link to comment
Share on other sites
blind_elk Grand Master

blind_elk

Posted
Posted
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.

Link to comment
Share on other sites
SLEEPA31 Explorer

SLEEPA31

Posted
  • Author
Posted

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.

Link to comment
Share on other sites
OMGGTR Mentor

OMGGTR

Posted
Posted

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 ?

Link to comment
Share on other sites
MBS206 Grand Master

MBS206

Posted
Posted

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.

Link to comment
Share on other sites
Pal Veteran

Pal

Posted
Posted

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

Link to comment
Share on other sites
OMGGTR Mentor

OMGGTR

Posted
Posted
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...

Link to comment
Share on other sites
SLEEPA31 Explorer

SLEEPA31

Posted
  • Author
Posted

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.

Link to comment
Share on other sites
jjskyline79 Community Regular

jjskyline79

Posted
Posted

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

Link to comment
Share on other sites
SLEEPA31 Explorer

SLEEPA31

Posted
  • Author
Posted

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. :)

Link to comment
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

    • TurboTapin
      CD009 RB Conversion

      By TurboTapin · Posted

      That's the most absurd thing I've ever heard. I would go cut bellhousing over that monstrosity of a flywheel all day, every day. It puts a lot more mass further from the last main bearing. I've had nothing but problems with Collins in the past and refuse to ever buy their products again. I would not trust anything they tell you. He's playing his salesman card.  I'm currently at 640whp on a mustang dyno (~770bhp) with the intentions of running E85 and a lot more power this upcoming spring. Cheers, 
    • GTSBoy
      PRP RB26 cast block + head prototype running

      By GTSBoy · Posted

      Nah, it's not the reduced knock margin. It is a direct mechanical effect of having to initiate the combustion earlier, while the piston is still rising, which starts to exert combustion pressure on the rising piston earlier, making the rest of the engine work harder to finish driving the piston up to TDC where the combustion pressure stops being a negative and starts being a positive. Your modern engine that only needs ~10° to make MBT doesn't waste the other 10 or so degrees of crank rotation. That's almost all of it. The difference in knock margin might go either way. Remember that modern engines to which you are currently comparing the long tractor engine (the RB) are now running super high compression, direct injection, tricky cam control and maybe even cylinder pressure sensors. You're not comparing apples with other fruit. It's apples and sea weed, or some other evolutionarily primitive vegetation. And remember, squish only really comes into play at the very end of the stroke. It certainly does good things, but it is not the biggest contributor to what's going on. It is quite possibly much less important in 4 valve head than 2 valvers also, because there is so much less squish available to a 4 valve anyway.
    • Dose Pipe Sutututu
      PRP RB26 cast block + head prototype running

      By Dose Pipe Sutututu · Posted

      Food for thought, a longer stroke motor would need less ignition timing vs. a shorter stroke motor requiring more ignition timing.
    • PranK
      Skid pans in/around Sydney?

      By PranK · Posted

      Thanks Duncan, HART is only 10 mins from me (I did my bike license there), it'd be awesome if it ran these types of things.  Sutton Road does look good and they take fewer cars than SMSP which is good.  Surely you have enough land to lay a few million tonnes of concrete and some sprinklers D? 
    • joshuaho96
      PRP RB26 cast block + head prototype running

      By joshuaho96 · Posted

      I thought an engine that needs more ignition timing to make power is going to result in less power due to reduced knock margin? More time for the combustion to propagate -> more time for it to heat up the rest of the mix to detonation.
×
×
  • Create New...