Jump to content
SAU Community

R31 Rb30E Cold Start Issue

SPINR31

By SPINR31,
in General Maintenance

 Share

Recommended Posts

SPINR31 Explorer

SPINR31

Posted
Posted

HI all,

So i just recently got a second hand engine installed after i blew my last one up..

all is well except for this really annoying cough/splutter on a cold start just off idle...

if you try and put any load on the engine when it is cold (around 1000rpm) it will cough and splutter to the point of stalling.

i recorded a video so you will know what im on about:

i have replaced:

Leads (top gun)

plugs (NGK)

Air Regulator (off another motor)

i also took the injectors, fuel rail and afm off my old motor which had no issues and it still does it.

if its worth mentioning:

1. Car is a manual conversion (never had issues before)

2. all is fine when it is warm

3. it seems to idle a lil low when cold(around 800 - 900rpm, could be more or less as i have a sticky tacho), but a little high (1100 rpm when warmed up)

Link to comment
https://www.sau.com.au/forums/topic/414953-r31-rb30e-cold-start-issue/
Share on other sites
Moodles2 Grand Master

Moodles2

Posted
Posted

I'm not sure how R31 ecus work, in a R32 and beyond I would suspect the coolant temp sensor (not the one that feeds the dash cluster, the one that feeds the ECU), when not functioning it might not be going into the cold start map (richer than the normal one).

  • 2 weeks later...
SPINR31 Explorer

SPINR31

Posted
  • Author
Posted

i had issues similar to this an adjustment to the TPS cleared it up

so i have tried so far:

1, Spraying crc contact cleaner on the AAC Connector, Both sides of the coil, Air Reg connectors, tps connector......

2. tried having a play around with the tps, fully clockwise it idled lower, didnt fix the issue with the spluttering..fully anti clockwise the issue wasnt any better but it idled higher

3. unplugged afm and it idled like shit, wouldnt rev etc so i know the afm works.

im baffled as to what it is

StevenCJR31 Veteran

StevenCJR31

Posted
Posted

if its not that then keep trying other similar things, 31s are getting old now and most of them have had the tits revved out of them by p platers and messed around with a lot

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

    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • GTSBoy
      NC MX5

      By GTSBoy · Posted

      Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • GTSBoy
      R33 GTR running -9 with no tune

      By GTSBoy · Posted

      So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • joshuaho96
      Squeaking clutch/throw out bearing

      By joshuaho96 · Posted

      Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
×
×
  • Create New...