Jump to content
SAU Community

Recommended Posts

Have just put new rb30 into r32 with rb25de head and rb20 cams. Since I've tried running it it idled like a dogs breakfast and stalls and in doing so the apexi avcr is saying injectors are at 90% duty cycle at idle. Car will running and revs out and when warm is ok but the idle starts to hunt from 1000 to 1500 also the idle at 800 is like its miss firing but its not. I have new temp sensor new coil packs new plugs new coil harness and the list goes on. The one plenum is a side intake and the aic valve sits underneath. Can anyone helps please. This making me pull my hair out.

Link to comment
https://www.sau.com.au/forums/topic/419823-new-rb30-running-like-crap/
Share on other sites

Could be a miilion things.

Has that ENTIRE setup come out of another running car or is it a freshly built engine with all the newly acquired parts used to put it all together?

What computer are you running? Has is been tuned at all to run on the current setup?

Is there a vacuum leak? Old fuel?

There's a whole lotta variables that you're going to have to go through one at a time in a logical order.

Good luck!!

Thanks mate. Yes all is new and its waiting to be tuned has bigtime in it. Found out it was typical aac valve issue but now its missfiring on cylinder 6. Has spark has fuel. Has new coil packs plugs coil loom and freshly clean injectors can't seem to isolate the issue. Ignores has good resistance and signal. Any help on that?

There was a guy just last week that found he had low battery voltage and that was enough to drop a couple of cylinders so try that first.

Have you swapped coils/injectors/spark plugs from cylinder 6 to see if the problem moves? If not do each item one at a time.

^^^ damn dude. ok so check low voltage. well today i pulled the coils out and swapped them with 3 others plus a spare nissan set i had in the shed with a spark tester and it has spark on every single tested coil pack i also pulled the injectors and checked that they have flow and swapped them around and ALL injectors have flow. also recalibrated fuel pressure regulator as it was getting 100psi pressure....................................??? anyway didnt fix the issue my ecu has a nistune daughter board it it to so what voltage should i be looking for from a skyline alternator?? 14.4v?? also now engine wont stay idling just dies pissing me off big time this has cost me 30k to build this thing.

Get a stock computer and try that (one that matches the head/wiring you're running).

It sounds like you might be on to something when you say it only plays us when bolted down. Possibly coil pack harness? Try one of those too if you can get your hands on one.

cas works well tested it, sctraching my head bout ecu been lots of rain here lately just did code check on ecu came up 55. has z32 afm wondering if that maybe an issue with old wiring i know alot of people fall on that too and doesnt come alot as being wrong will try sitting coil pack on head with a lead running from coil pack to plug tomorrow. timings right. it has rb25de head on forged rb30 awd bottom end in a r32 gts4 stock cams fully recoed head and new 100lb valve springs arp head studs and rb26 head gasket. so i'm ruleling out compression issue. stupid thing has piston slap above 1500 rpm in 1st cylinder though thats another story i know what i have to do to resolve that. theres not much that isnt new on it. maybe needs more earthing out from block???

any number of reasons (including the above) for cylinders to randomly drop. . . when mine did it -turned out the stock ecu was as crook as a chook

forgot to add. .electrician told me some of the pins on the wiring loom(going into the ecu) was a bit dirty , when you moved the ecu with the engine running it would sometimes drop a cylinder or just stall, maybe if you sniff around there you might find your problem

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

    • I mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
    • Yes they do. For some maybe. But for those used the most by abusers, ie Skylines, the numbers are known. The stock eyebrow height for R32/3 Skylines is about 365/375mm or thereabouts. The minimum such heights are recorded in adjacent columns in the database.
×
×
  • Create New...