n54 JB4 engine light when cold

Robboo · 11-13-2017, 03:06 AM

Hi Guys,

Recently got my jb4 fitted, all was good for a few days.

Now whenever the car is cold (below the oil temp for the jb4) if i put my foot down it will throw up an engine light puts me in limp mode and gives me a 30FF fault code.

Also I noticed the boost on fuel gauge doesnt seem to move off around 2-4psi

But as soon as the cars warm up to activate the jb4 it seems to boost fine up to around 12-13psi and doesnt throw an engine light

Anyone got any ideas? Charge pipe isnt cracked, wastegates arent rattling and cant see any visible vacuum leaks really

Robboo · 11-13-2017, 12:40 PM

Edit: does seem to affect the car when warm as well actually

Only seems to run 9-10psi on map 1

Vacuum hoses mostly look fine, any hidden ones I should check?

11-13-2017, 03:06 AM	#1
Robboo New Member 4 Rep 20 Posts Drives: 335i Join Date: Jul 2017 Location: Surrey iTrader: (0)	n54 JB4 engine light when cold Hi Guys, Recently got my jb4 fitted, all was good for a few days. Now whenever the car is cold (below the oil temp for the jb4) if i put my foot down it will throw up an engine light puts me in limp mode and gives me a 30FF fault code. Also I noticed the boost on fuel gauge doesnt seem to move off around 2-4psi But as soon as the cars warm up to activate the jb4 it seems to boost fine up to around 12-13psi and doesnt throw an engine light Anyone got any ideas? Charge pipe isnt cracked, wastegates arent rattling and cant see any visible vacuum leaks really Last edited by Robboo; 11-13-2017 at 01:02 PM..
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11-13-2017, 12:40 PM	#2
Robboo New Member 4 Rep 20 Posts Drives: 335i Join Date: Jul 2017 Location: Surrey iTrader: (0)	Edit: does seem to affect the car when warm as well actually Only seems to run 9-10psi on map 1 Vacuum hoses mostly look fine, any hidden ones I should check?
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