Jump to content
SAU Community

Recommended Posts

have some major issue with my gtst. am struggling to even get up a hill without a cruising run up at it at present. once the boost needs to raise the car just labours/surges with no power. does this even on flat surfaces if trying to boost as well. any help appreciated.

could it be the afm , considiering it runs ok under normal driving conditions&just like a bag o shit under load?

yeah fuel pump is next thing, have hardwired as per the way this thread has stated, but no noticeable difference really. if the pump is stuffed will it still able to be pumpin fuel readily enough, can get the car going fine like probably about 140km/h on the straight, but as soonas try for thaT LITTLE BIT MORE, SEE THE BOOST GAUGE CREEP OFF ZERO, THEN IT JUST DOESNT SEEM TO KNOW WHATS GOING ON AND JUST COUGHS and splutters, the boost will go then drop, go then drop etc, but with no power sort of thinmg. is hard to xplain

Link to comment
https://www.sau.com.au/forums/topic/63043-why-my-33-stuffed-under-boostload/
Share on other sites

could be coilpacks. does it miss at all when up in the revs?? what about idle, does it idle a bit rough at times?? if you wind the boost down does it help??

if you get stuck, call hunter thomas automotive 49681362 and speak to paul thomas, he is the man.

cheers

Linton

Will most probably be the AFM. Try to get another one to plug in temporarily. ie Borrow from a friend or try to talk an importer into lending you one for ten minutes and you'll buy one if that's the prob. They usually do this for ya.

While you're doing that, check your spark plugs. What condition are they in? Showing signs of running lean or rich? if not then AFM if lean then possibly fuel pump or injector, if rich then possibly plugs or coil packs.

Hope this helps.

Something quick and cheap you could try is tape up your coilpacks with electrical tape and then take it for a spin. If it's better you know it is coil related, if it doesn't make a difference then you know the problem could be elsewhere.

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

    • My thinking is that if the O2 sensor is shot then your entire above described experience is pure placebo.
    • Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
    • -10 is plenty for running to an oil cooler. When you look at oil feeds, like power steering feeds, they're much smaller, and then just a larger hose size to move volume in less pressure. No need for -12. Even on the race cars, like Duncans, and endurance cars, most of them are all running -10 and everything works perfectly fine, temps are under control, and there's no restrictions.
    • Update: O2 sensor in my downpipe turned out to be faulty when I plugged in to the Haltech software. Was getting a "open circuit" warning. Tons of carbon buildup on it, probably from when I was running rich for a while before getting it corrected. Replaced with new unit and test drove again. The shuffle still happens, albeit far less now. I am not able to replicate it as reliably and it no longer happens at the same RPM levels as before. The only time I was able to hear it was in 5th going uphill and another time in 5th where there was no noticeable incline but applying more throttle first sped it up and then cleared it. Then once in 4th when I slightly lifted the throttle going over a bump but cleared right after. My understanding is that with the O2 sensor out, the ECU relies entirely on the MAP tune and isn't able to make its small adjustments based on the sensors reading. All in all, a big improvement, though not the silver bullet. Will try validating the actuators are set up correctly, and potentially setting up shop time to tune the boost controller on closed loop rather than the open loop it is set to now. Think if it's set up on closed loop to take the O2 reading, that should deal with these last bits. Will try to update again as I go. 
×
×
  • Create New...