[jcarlo7]

My car is currently not boosting at all. Stuck at 0 psi. I have jb4 with g4 board. I just had a few oil leaks fixed and an intercooler installed. My mechanic checked for anything that could be wrong in the engine such as intercooler piping being loose or vacuum lines etc and everything is working fine but still no boost. I installed the bms usb cable yesterday and just did a log but need help. I'll attach it on here

[jcarlo7]

Up

[mojobmw_e90]

Boost leak. Recheck the pipes again. Also check all the hoses going to and from the boost solenoids.

[jcarlo7]

Originally Posted by mojobmw_e90

Boost leak. Recheck the pipes again. Also check all the hoses going to and from the boost solenoids.

I had it checked yesterday and no leaks or loose piping. All of the lines are good as well

[MM Performance]

What map are you on? Maybe you accidentally switched to map 8 which is a zero boost map (wastegates fully open all the time)

[mojobmw_e90]

Try throwing it into map0 and see if it will boost 8psi which is stock.are you getting an smoking or whining noises from the engine bay?

[jcarlo7]

Originally Posted by MM Performance

What map are you on? Maybe you accidentally switched to map 8 which is a zero boost map (wastegates fully open all the time)

I'm still on the G4 board so no map 8 with the old firmware I have

[jcarlo7]

Originally Posted by mojobmw_e90

Try throwing it into map0 and see if it will boost 8psi which is stock.are you getting an smoking or whining noises from the engine bay?

I've tried map 0,1,2 and 5 and still no boost

[jcarlo7]

Up

[N54Bob1988]

You had a intercooler installed and other work done. Its a boost leak or they messed up the vac lines to the solenoids . Or the bov or diverter valves are fubar. Id take it back and complain. All you can do. Based on what was done id say something wasn't reinstalled right

[mojobmw_e90]

I'm willing to bet it's that elbow on the drivers side intercooler that's very loose but looks connected

[MM Performance]

Either you have something disconnected really badly like an intercooler coupler or your wastegates have stopped working because

A) your vac lines are unplugged from the actuators or both have a significant leak

B) your solenoids are failed closed both for some reason (maybe an electrical short or maybe they are just failed)

C) vac isn't getting to the solenoids for some reason (pinched hose or disconnected hose somewhere or vac leak)

D) there is some sort of mechanical WG failure like rods disconnected (failed e clip) or diaphragm tore inside actuators or flapper itself broken

E) the turbine fins are broken off

The list goes from most probable, to very rare

Can you hear spool going on even though no boost?

[Abacus38]

99.9% sure its a boost leak. Make sure you take off the undershield and thoroughly check every connection and retighten them. If that doesn't work replace all the vacuum hoses. The hoses are known to crack when they get old.

[Chrisruf911]

Be sure to thoroughly check the charge pipe clamps. I had one that was cracked on the end where the tbolt mounts and visually it looked fine. Under boost it would open up.

[Mike@N54Tuning.com]

You are not throwing any codes?

Mike

[mike@x-ph.com]

Im surprised as well that you are not getting any codes

[924er]

Boost solenoids

[Mike@N54Tuning.com]

Originally Posted by mike@x-ph.com

Im surprised as well that you are not getting any codes

+1

There is something wrong either with the log or something else. I don't think there is a way you can have ZERO boost at WOT and no codes. Something is not adding up here.

Also to add...

The G4 board is very obsolete you should upgrade it to the G5 board. But it could be anything from a boost leak to an installation issue to a wastegate vacuum line issue.

Mike

[335NJ]

You didn't try uploading any recent firmware onto the old G4 board correct?

[idrift4wd]

you sure you have a 335i? lol

[jcarlo7]

Originally Posted by 335NJ

You didn't try uploading any recent firmware onto the old G4 board correct?

I didn't try to upload new software

[jcarlo7]

I had the car checked at my local turbo shop just now. No boost leaks, no codes, vacuum lines are good, nothing is loose either