[fredcase]

I am getting an occasional 30ff low boost only under light throttle conditions. If I'm cruising at a speed for a while and giver her a little gas I get the 30ff. Hits target 16psi no problem at full throttle. (map 2)

It was happening before with dinan stage 2, and seems a little more frequent being jb4, fbo now.

I changed both boost solonoids, vacuum lines and chargepipe still happening.

[335NJ]

Could be vacuum related, test the vacuum system to make sure there's no hidden leaks. I see you already did the common vacuum related things, but did you replace each line?

Other than that, maybe a faulty sensor?

[Jeff@TopGearSolutions]

Stock DV? Checked intercooler connections?

[fredcase]

Intercooler is ok. But am on stock dv's

[mike@x-ph.com]

Originally Posted by fredcase

I am getting an occasional 30ff low boost only under light throttle conditions. If I'm cruising at a speed for a while and giver her a little gas I get the 30ff. Hits target 16psi no problem at full throttle. (map 2)

It was happening before with dinan stage 2, and seems a little more frequent being jb4, fbo now.

I changed both boost solonoids, vacuum lines and chargepipe still happening.

I was having that problem for a while.
Contacted Terry and he told me to upgrade to the newest firware. Got it fixed.
Make sure you have the newest firmware

[fredcase]

Originally Posted by mike@x-ph.com

I was having that problem for a while.
Contacted Terry and he told me to upgrade to the newest firware. Got it fixed.
Make sure you have the newest firmware

Do have. Like i said. Itwas doing this before the jb4. So i dont hink its a software issue. If i had a leak, i wouldn't be able to hit boost wot.

I think something is sticking, either wastegate or dv. It happens immediatly after giving some gas radomly.

[335NJ]

Even though this issue was prior to the JB4, make sure all DUTY BIAS values are set to 0 in the interface. Assuming you're using firmware 28_7 & up.

[fredcase]

Originally Posted by 335NJ

Even though this issue was prior to the JB4, make sure all DUTY BIAS values are set to 0 in the interface. Assuming you're using firmware 28_7 & up.

Done. Just reset adaptations this morning also. See if that helps.

[GoRomeo]

Originally Posted by mike@x-ph.com

I was having that problem for a while.
Contacted Terry and he told me to upgrade to the newest firware. Got it fixed.
Make sure you have the newest firmware.

Hey Mike. I know this is an old thread but what do you mean by “the latest firmware” ?? Are you talking about the newest firmware in the car’s DME??

I sometimes have this 30ff code on light throttle and goes away when I turn off/on car. I was told by my dealership that there is a newer firmware for my car but at the same time I want to make sure before I do it. I have 2008 135 N54 engine. Thanks.

[swellengear]

Originally Posted by GoRomeo

Hey Mike. I know this is an old thread but what do you mean by “the latest firmware” ?? Are you talking about the newest firmware in the car’s DME??

I sometimes have this 30ff code on light throttle and goes away when I turn off/on car. I was told by my dealership that there is a newer firmware for my car but at the same time I want to make sure before I do it. I have 2008 135 N54 engine. Thanks.

I'm fairly sure he's referring to the JB4 firmware. He mentioned Terry, he's one of the guys behind the development of the JB4.