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0.5 Bar Limp Mode?

gwin

By gwin,
in General Maintenance

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gwin Proficient

gwin

Posted
Posted

Something funny happened to my car on the way out today.

I started to notice a severe powerloss and a very husky exhaust note when on full throttle. I then checked my boost meter and the max boost was only 0.5 bar (vs 1bar).

It felt like my car was limping, but no engine lights were on.

I do have a brake/clutch issue at the moment with the handbrake light on, but that shouldn't have anything to do with boost limp.

So my solution was to turn off the car, then restart. And walla! The boost limp was gone... WTF?

Anyone had this problem before?

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https://www.sau.com.au/forums/topic/325961-05-bar-limp-mode/
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mad082 Grand Master

mad082

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Posted

does the ecu control the boost on the r32? if it is a seperate boost controller then most likely the boost controller was the issue and turning off the car was enough to reset whatever the issue was, and it most likely had nothing to do with the ecu or engine. it felt sluggish simple because you were onlt getting half the boost you normally had.

mad082 Grand Master

mad082

Posted
Posted

may be a slight blockage in it. when i had a turbosmart dual stage controller on my 33, occasionally when i changed gears the controller wouldn't release the pressure between it and the wastegate, so the wastegate would stay open a bit and it would hardly make any boost and feel like a slug

  • 3 weeks later...
gwin Proficient

gwin

Posted
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Posted

Update:

OK the problem is still there after doing the clutch work.

I've started to pick up a pattern, it happens especially obvious after long start stop traffic. My car's acceleration/revving will hesitate badly, and the exhaust note changes to a husky metallic sound. There is severe powerloss, really bad boost and really hard to rev/unresponsive engine.

To cure this, I stop by the side of the road, power off the engine for around 20 seconds, and power back on. It goes away!

AFMS cleaned, new coilpacks.

I'm starting to think it's dodgy fuel pump related, as googling around symptoms typically relate to my situation. Some say due to fuel pump overheating, it starts to play up.

Can anyone confirm that they have had the same problem?

  • 4 weeks later...
gtr fan Experienced

gtr fan

Posted
Posted (edited)

I did have the same problem about 7 years ago. Especially on cold nights. It would boost initially to one bar, then fall into limp mode and not go over 0.5bar. Then pull over turn off engine and start up again problem would go away.

I installed a blitz EBC hoping this would fix the issue but no luck.

I knew the ECU was chipped so then I bought a powerfc and this solved everything. Just use the check engine light as a knock sensor and back off when ever I have too (which is very rarely).

Given it goes away once you restart the car I would be betting it is ecu related.

Edited by gtr fan

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