Jump to content
SAU Community

Fuel And Idle Problems

vitz_n1

By vitz_n1,
in Engines & Forced Induction

 Share

Recommended Posts

vitz_n1 Community Regular

vitz_n1

Posted
Posted

hey guys, just got a few q's about some issues im having.

The issue is with start up/idle. When i start my car i always turn the ignition on and wait for the fuel pump to prime, but when i do this, just before its primed it starts to make a bubbling noise. sounds like there is air in the fuel lines or something. Then when i start the car i have to give it a bit of throttle to start it. Thennn on idle she has a miss, its REAL bad when its cold, nearly stalls sometimes and gets better as she warms up, but never stops. When i drive its fine and dosn't miss a beat. I am also getting shocking mileage from a tank.... about 300 - 340 km per tank. And to top it off i think it leaning out bad after about 6000rpm :S

Only fuel system mods i have are bosch in tank pump and safc II.

Anyway, im taking the car down to the dyno on tuesday to have it tuned and looked over but i just wanna know if there is a solution to this as id rather have it fixed before the dyno rather than going there and then having to fix it and go back.....

Cheers

Link to comment
https://www.sau.com.au/forums/topic/174043-fuel-and-idle-problems/
Share on other sites
tacker Mentor

tacker

Posted
Posted

could be a duff plug or 2. Did you have the car tuned after fitting bigger fuel pump as it may well have stuffed the old tune. I did see a lower AFR when i put new fuel pumps in and if your old pumps was a little tired evenmore so, and if your running rich you may have fouled a plug hence why it idles a bit rough until it warms up.

Then again i could be wrong as i seem to be good at that. :-)

vitz_n1 Community Regular

vitz_n1

Posted
  • Author
Posted

i have not had my injectors looked at, nor do i know the age of the fuel pump as i purchased the car with it. i dont think its sparkies as i changed them and that did nothing.

Also, would gtr injectors run on a standard gtst ecu? when i purchased the car it had a re-mapped ecu and the guy i bought it off said he thinks it has gtr injectors. i later changed to a standard computer thinking that it may have been a shit tune, but it was exactly the same so i assumed they were standard.... if they are gtr ones that may be it.... :S

mad082 Grand Master

mad082

Posted
Posted

i get that bubbling noise in the missus pulsar, and it starts perfectly, so i don't think it would be that. it could be a clogged injector which isn't shutting off 100% so richening the mixtures up. otherwise try cleaning the aac and iac valves to make sure it isn't them.

vitz_n1 Community Regular

vitz_n1

Posted
  • Author
Posted

Ok! I've now had the car down at the dyno and it is running really lean everywhere. initially it was thought to be the air flow meter. i replaced that but it didnt really change anything.

-Tacker- The injectors have red tops

im now backing the injector theory and possibly just bad fuel pressure. is there a way to test fuel pressure and the fuel pressure reg?

Also mad082 how do i clean the aac and iac valves? and where is the iac valve located?

Cheers

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
      After market rear camber arm adjustment

      By Duncan · Posted

      Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I know I have to get a wheel alignment but until then I just need to bring the rear tyres in a bit they're wearing to the belt on the inside and brand new on the outside edge. I did shorten the arms a bit but got it wrong now after a few klms the Slip and VDC lights come on. I'd just like to get it to a point where I can drive for another week or two before getting an alignment. I've had to pay a lot of other stuff recently so doing it myself is my only option 
    • Duncan
      After market rear camber arm adjustment

      By Duncan · Posted

      You just need a wheel alignment after, so just set them to the same as current and drive to the shop. As there are 2 upper links it may also be worth adding adjustable upper front links at the same time; these reduce bump steer when you move the camber (note that setting those correctly takes a lot longer as you have to recheck the camber at each length of the toe arm, through a range of movement, so you could just ignore that unless the handling becomes unpredictable)
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I got adjustable after market rear camber arm to replace the stock one's because got sick of having to buy new rear tyres every few months. Can anyone please let me know what the best adjustment length would be. I don't have the old ones anymore to get measurements. I'm guessing the stock measurement minus a few mm would do it. Please any help on replacing them would be fantastic I've watched the YouTube clips but no-one talks about how long to set the camber arm to.
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Heh. I copied the link to the video direct, instead of the thread I mentioned. But the video is the main value content anyway. Otherwise, yes, in Europe, surely you'd be expected to buy local. Being whichever flavour of Michelin, Continental or Pirelli suits your usage model.
×
×
  • Create New...