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Fg Gradual Power Loss After Custom Tune


astroinc

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  • Member For: 20y 8m 25d

Hoping somebody might be able to help.

This is the story so far:

FG Auto had its first custom tune 6 weeks ago nothing fancy just a K&N Filter and 290 kw tune. The results were awesome, nice smooth loud spool and able to break traction on even light throttle. All going really well.

2 weeks later the MIL on the dash was triggered. Not wanting to break anything I pulled over and flashed back to stock and called my tuner who advised it is likely to be the o2 sensor.So all good. When I tried flashing back to the tune the Xcal 3 failed to download and locked me out of the custom tune altogether. Tuner advised to flash back to stock then reload. I had a few voltage issues but managed to get it back to stock then back into the custom tune.

Another 2 weeks went by and the MIL light came on, but this time I ignored it and it went away after a day. I also started to notice the spooling at low revs was less audible and the power was less impressive and I was no longer able to break traction even under WOT. I get a little bit of boost at the top end of the rev range or under load at 100km/h. It feels more like a NA engine and not much better in performance than the stock tune. The exhaust/ engine noise is also a bit louder. I have also noticed each time I park the car the fan comes on nearly every time now.

Over the last 2 weeks I have changed my fuel to rule out a bad batch, I have checked the hoses that I could see and everything seems to be still attached, I would tighten the clamps but they have changed the clamp type from the BA and I can't work out how to tighten them.

Any ideas on what it could be would be appreciated.

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  • Member For: 14y 4m 27d
  • Gender: Male

Yea, it may pay to ditch the ford ones. I believe they are they are 'blind' ones where the head snaps off when they are at the right tension.

Also, there is a fault with the rubber joiner on the FG's that it splits where the pipe goes into the throttle body. Check there are no cracks...

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  • Member For: 13y 4m 23d
  • Gender: Male
  • Location: Yeppoon qld

The stock clamps have a cover over the hex head. Pull then off with a pair of pliers. With the increased boost it is a good idea to replace the stock pipes anyway. Is it a standard cat? If not the tuner should've sorted out the o2 sensor when doing the tune. Or like said above heat soak with a stock cooler.

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  • Member For: 17y 8m 25d
  • Gender: Male
  • Location: Gladstone, Queensland

Check for leaks like the boys already said, but a good idea would be to actually use the Xcal to check for DTC's It will tell you exactly what is triggering the MIL.

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