Jump to content
SAU Community

Recommended Posts

got my car back today (r32 gtst with rb25det neo) and as you accelarate in low revs it stutters a bit...almost like its gasping for fuel and then as you give it a bit more on the gas it corrects itself after about 3500revs and revs smooth all the way to the top of the rev range. No its not a miss fire as ive had a miss b4 and this is different. car is pretty highly modded. just got splitfires, and have had gtr pump, 630cc injectors and microtech for ages. Car just had a full tune + remap and it was done by one of the best tuners in aus. not sure whats going on? can anyone shed some light before I call him in the morning?

thanks

Luke

Link to comment
https://www.sau.com.au/forums/topic/188002-car-is-stuttering-on-low-revs-wtf/
Share on other sites

grab some CO contact cleaner from repco, clean the airflow meter wire. only do it if the car hasnt been run in atleast 12hrs

check for boost leaks.

fixed a mates 32 that way.

obviously no responsibility is taken if you damage the AFM or car in anyway.

-Ryan

Whats been done to it between tuning and getting it back?

because a light load misfire is pretty bloody obvious and your tuner should have mentioned something.

He must have done some light load tuning, and because the ecu is map based a vacuum leak doesn't really affect it if it was tuned with it.

so, it's either a vacuum leak thats happened after the tune, a sticky injector maybe, or the tune is up to shit.

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

    • After using a protractor for an actually accurate assessment of what is required,  and by NOT using my uncalibrated eyeball I worked out I need a 25° silicone bend from the TB ro the MAF, but, my choice was either a 30° or a 23° (23° is a weird spec), so I grabbed the 23° one from Raceworks I also grabbed 1mtr of 3" straight from Just Jap, I needed 350mm, but they only had 300mm, or 1mtr lengths....meh Also ordered a 1/2" hose bulkhead fitting from fleabay, this has a smoothish mushroom looking head (they are designed for below the water line of boats) that will fit inside the bend, the hose bit and threaded bit looks to long, but nothing that a hacksaw cannot fix if required, the hose will then just get jamed on the threaded bit up to the retaining nut Fingers crossed and the unsightly amount of hose clamps will be reduced down to 4 once all the parts arrive 
    • Oil change does not trigger code 21. Code 21 is for coilpacks primary side connection. You can try to clear the code with a battery disconnect, hold down the brake pedal to drain capacitors through the brake lights with the ignition on for 10-15 seconds before you reconnect the battery. I have seen R35 coil conversion permanently cause this code with no ill effects so it might be the resistance it wants to see isn't quite right on one or more coilpacks. Could be inside the ECU, could be the harness, could be a coil. You can test it all if you want or just ignore until the car actually starts misfiring.
    • I forgot you have a Nistune ECU. Use Nistune to do all the tests I mentioned instead of faffing with 30+ year old electrical connectors. You can read MAF volts off that too, there are reference values in the service manual to tell you roughly what it should be in different conditions.
    • No. I think it might be the AFM. Hence the use of the terms "swaptronics", which implies the use of swapping out electronics for the purpose of diagnosis. It's about the only way to prove that a small/niggling/whatever problem with an AFM or a CAS or similar is actually caused by that AFM/CAS/whatever. A known good item swapped in that still gives the same problem is likely to be caused somewhere else. They're all the same. Spraying AFMs with cleaner is an each way bet between cleaning it and f**king it.
    • Oh wow! This might actually work amazingly. Do you know the ratio of the diff? I was told the only thing you need to make sure of is if the front & rear diff ratios are the same. Ours is a 4.083 Thanks!
×
×
  • Create New...