Jump to content
SAU Community

Recommended Posts

Hey guys/gals

My car has started missing at idle out of nowhere and i cant quite figure out why :)

I know most lines have a very slight miss when idling and mine did too

But now its constant like every 2 seconds, not quite as bad as having dropped a cylinder though.

-It misses more as the oil temps go up

-If i step on the gas in neutral and hold the revs eg: 2000rpm it still misses a bit but not as bad as when its idling

-It used to misfire a bit on boost (16psi) with the old coils but with the new ones it doesn't at all.

-I'm not down on power at all and the car drives normally.

Ive just put in a set of new justjap coilpacks, new spark plugs and gave the afm and aac valve a good clean

The coils helped a bit but it still misses

Raised the idle a tad and that didn't help

Ran some injector cleaner but i might try another brand as well

Checked all the cooler piping for leaks and my vaccum pressure hasn't changed

Fuel filter has been changed

I'm going to try a different ignitor pack and see if that makes a difference

I've considered a bad injector, how can i tell if one of my injectors are blocked/leaking?

What would i be looking for if i put it on a dyno?

Would the TPS have anything to do with this?

Im running an RB20 with:

RB25 highflow

GTR injectors

Z32 afm

040 fuel pump

Ecu remap

What else could it be?

Edited by r32woohoo
Link to comment
https://www.sau.com.au/forums/topic/187017-help-im-stumped/
Share on other sites

Mine has a slight miss at idle. I got hold of a widband 02, turns out i'm running between 19:1 - 20:1 AFR at idle. And only way to get it to idle at ~1000rpm is to have that AFR. When the car is cold it starts off around 14:1. I'm dropping my engine out next week and i'll clean the aac valve while it's out.

Link to comment
https://www.sau.com.au/forums/topic/187017-help-im-stumped/#findComment-3379076
Share on other sites

Ok so i can rule out the TPS.

As for coilpacks theyre all brand new and the plugs are in nice and tight.

In my head if the coil plugs were loose or the loom was shot then wouldn't it be intermittently missing everywhere, and dropping a cylinder? I don't think its dropping a cylinder coz it doesnt sound that bad, and theres no smoke spewing out from the extra fuel

My miss is constant and only at idle :)

my plugs are at a .65mm gap at the moment.

thats what i was running with the old coils for about 6 months before this started happening

now that ive got the new coils i havent been bothered to open the gap up but i'll give it a go tomorrow

Edited by r32woohoo
Link to comment
https://www.sau.com.au/forums/topic/187017-help-im-stumped/#findComment-3379445
Share on other sites

My plugs were down about .6 aswell as i was chasing a miss-fire (which turned out to be a loose wire on a coil.

Once i fixed the coil it would miss on light load / idle re-gapped the plugs to .8 and haven't had a miss since.

So I suggest you try re gapping your plugs first (even if i is a pain in the ass)

Andrew

Link to comment
https://www.sau.com.au/forums/topic/187017-help-im-stumped/#findComment-3379913
Share on other sites

  • 1 year later...
  • 1 month later...

Having the same problem here guys. Dropping Cylinder 2 when the car warms up.

So far, new items installed:

Spark Plugs

Ignitor

Coil Packs

Coil Pack Loom

Tried that and Cylinder 2 still drops out when the car is warm. Also, Cylinder 2 comes back on when driving or revving the engine (but with a misfire).

Any other ideas? CAS?

Appears to be a temp issue..anyone?

Link to comment
https://www.sau.com.au/forums/topic/187017-help-im-stumped/#findComment-4541645
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


  • Similar Content

  • Latest Posts

    • A 1.5 way is a 2 way. It is just a 2 way with a less aggressive ramp on overrun.
    • The ABS and/or TCS being missing/broken will not cause the engine to misbehave. It just casues CEL to come on and annoy you. The CEL is useless if it is always on, so you have to do the things you have to do to get rid of it, so it can be useful. Being a Stag ECU, then yes, it will not expect TCS to be present. But it will expect ABS to be present and working. You will need to either make the ABS CU talk to the ECU (don't ask me what that will take on an NA R34), and make sure the hardware is working....or, you just need to blank it out in Nistune. Do not persist with the stock ECU. You will just have problems. Gte it Nistuned. Start from there. DO YOU HAVE A BOOST SENSOR? The ECU's boost sensor that it. It is connected to the loom at the rear of the coil cover. Usually rides on the firewall on an R34, but is usually bolted down to a bracket along with all the other crap at the back of the coil cover when a Neo is dropped into another car. If you do not have it, the ECU will shit the bed. So, do you have one?
    • So sadly the fuel pump etc was not it. The pump and filter is new and it is still cutting around 4000 rpm. A read something about ABS/TCS (engine is from stagea and ECU too so no TCS) and i dont know for 100% that my car has ABS. It has ABS "cube" in engine bay but i dont think it works(or at least from my braking experience). Can be something like that?  I will be driving the car next week to Nistune tuner to properly see what is wrong...  
    • the Tomei LSD fluid with lsd kit. frustrated that it was shaking the car to crap and affecting everything else negatively, I pulled the diff last night, and removed the lsd carrier, could not find anything wrong, however it seem to be 100 locked up acceleration, and deacceleration, wondering if they sent me a 2 way not a 1.5??  either way I installed the stock open carrier back in place. test drove everything smooth as butter again. no shake, shutter, random, what felt like clutch slip and grab or drive shaft play, etc. something differently wrong in side the lsd. I might bother taking it apart (if possible) to figure out what's going on inside this carrier, as bought too long ago to return.  only draw back is its back to a one wheel wonder.
×
×
  • Create New...