Jump to content
SAU Community

R33 Gtst Cutting Out Under Load

arrydjay

By arrydjay,
in Engines & Forced Induction

 Share

Recommended Posts

Rolls Grand Master

Rolls

Posted
Posted

overfueling causing a rich misfire due to air leak, dodgy afm, bad spark (coils or spark plugs).

That or it is leaning out due to fuel pump.

Smoke test the intake to rule out air leaks, replace the coil packs as good maintenance on a 20 year old car, new plugs with 0.6mm gap to confirm it isn't a spark issue. Change the fuel pump as good maintenance on an unknown 20 year old car.

  • Replies 50
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Rolls Grand Master

Rolls

Posted
Posted

Does the car run like absolute shit at all revs? If it is out by 2 teeth it would be terrible to drive!

I hope that is what is the problem, I just think if that was the case that whoever did the belt would have noticed straight away.

soultz Community Regular

soultz

Posted
Posted

i bought the car like that, and the previous owner just changed it in the service, problem is whoever done it didnt know what they were doing as they were a genral mechanic, not a nissan mechanic specifically...it has to be that. its getting put on the dyno tomorrow, air/fuel ratios and boost are being checked and they will find out whats going on

Rolls Grand Master

Rolls

Posted
Posted (edited)

Must have been a pretty shit mechanic if they can't line the white mark up lol. Nothing nissan specific about doing a timing belt.

Good call with taking it to a workshop, be easier than trying to guess what is wrong with it.

Edited by Rolls
soultz Community Regular

soultz

Posted
Posted

yeah well these guys do skylines day in day out so they know whats going on, and he said garunteed they will find the cause and the computer can be read by them obviously so enough stuffing around with it ill get it looked at properly haha

arrydjay Community Regular

arrydjay

Posted
  • Author
Posted

Took it to Toshi today and he figured it out....

He said the way the stock fuel pump works, it gets a lower voltage when at idle and low revs and then the full 12v at high revs.

The Walbro apparently didn't like this so he wired in another ground so that it gets full power all the time.

Problem seems to be gone....lets hope it stays that way.

soultz Community Regular

soultz

Posted
Posted

^^ good job mate. my problem is fixed too. coil pack #6 was missfiring. and the ecu wasnt grounding properly apparently. got a blitz dump pipe fitted aswell while it was there. made 145rwkw in 3rd. not bad for a stockie

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

    • Duncan
      S1 rb25/s14 starting problem

      By Duncan · Posted

      Depending on how long the car sat it is very possible for injectors to be stuck open or closed, I'd get them cleaned and flow tested. Other than that, obviously when the loom changes and the car doesn't start any more....the loom is suspect so some tracing / comparing may be required
    • 25zenki
      S1 rb25/s14 starting problem

      By 25zenki · Posted

      Harness is for a s1 Rb25det, and it is engine and lower harness.  the old harness had broken off plugs and was in very rough condition/exposed wires and splices etc. it is not able to be put back on the car, I could visually inspect to see if they had rewired any pins on the ecu plug. The fuel pump definitly isn’t turning off it’s an external pump and very loud you can hear it. Will look at the other harness tonight, am also going to pull the fuel rail and watch the injectors spray, will update here with what I find. Pretty sure at this point it has to be something to do with injectors because car will fire up on starting fluid and cas is clicking the Injectors. Fuel pressure is steady 43psi 
    • Waders360
      M35 Brake caliper replacement

      By Waders360 · Posted

      Sorry. Front brake calipers
    • MBS206
      S1 rb25/s14 starting problem

      By MBS206 · Posted

      Check the injectors flow evenly, and are actually flowing what you and the ECU think they should be flowing. If it's starting up on starter fluid, you have a fuel issue. Is it possible under cranking your fuel pump is turning off?   The harness you replaced, is that the whole engine harness? Do yourself a test, and drop the old harness on and plug it into the Z32 ECU. It's possible they've wired things different. From memory S1 to S2 is different in RB25 and you may have a wrong loom
    • 25zenki
      S1 rb25/s14 starting problem

      By 25zenki · Posted

      I haven’t pulled the injectors to watch them spray yet but they are clicking from the cas and all of the spark plugs are wet with fuel. I’ve thought the cylinders were being flooded from the beginning and was hoping fuel pressure would fix it. Tonight I am going to pull the rail and watch the injectors spray. Don’t know how to test/diagnose if the plugs are firing in correct sequence but that should be a timing thing and as far as timing goes my car still has the half moon for the cas can only install it 1 way. And my mechanical timing is 100% correct I posted photos above. Confirmed with the balancer on and off. 
×
×
  • Create New...