Boost Problems

[GoBoost]

Howdy guys,

Well im officially back in GA as of this morning (woo!), and the problem i hoped would magically go away has not. I have an AEM truboost boost controller, and it has pretty much stopped holding boost. On the last day before I left, I was getting on the gas a little (barely, but enough to build boost) and the boost did not stop when it should have. Every gear is building boost too quick. I looked around the engine bay and didnt see anything immediately wrong, or disconnected, but i had to leave. Well i got back today, and the same problem is still happening. Even when i set the controller to the "off" position, it should only boost to 11 psi or so, but it's still building up an enormous amount of boost quickly.

Does anyone know what could be causing this? I havent been able to drive "spirited" at all since i've been home....

Input appreciated, please save off topic convo until after problem solved :D
(shunder, tripp :P )

[lazyevo<3]

BOV might be stuck i think that can cause it not sure tho

[shunderwunder]

Off topic. Who me? ;)
It wouldn't be the BOV/DV, but it could be something with the wastegate not opening correctly or at all. Is it building too much boost or just building boost quicker than you think it should(which I dont think is a problem)? If your boost is going higher than it's set than I'd say that the wastgate is either stuck or your boost controll solenoid is not working.

[lazyevo<3]

+1 hhaha^^ it kinda was a guess

[ryanowarrior]

that was funny, off topic lol!! why are you running that boost controller?? have you tried goin back to stock set-up?

[TripperFx3]

I have to agree with shunder. Have you done the WGA upgrade? If so maybe the wastegate is stuck. If not I'd bet that it is something in the boost controller solenoid. Try going back to stock.

[EmminoDaGreaT]

Are you sure that you have the solenoid hooked up right on the boost controller? Port wise.

[TouringBubble]

To troubleshoot ... bypass the boost control solenoid and run manifold pressure directly to the wastegate. That should give you 11 psi. If it still overboosts, then it's a WG issue. If not, then it's a solenoid issue.

If it is the solenoid (as I assume), double check the hose routing as mentioned. If it is correct, then the solenoid has likely cone bad and is stuck in a full closed position. Purchase the Ingersol Rand solenoid to replace it ... about $30.

[GoBoost]

Ah thanks. Im gonna buy the new WGA in about a week. I dont think it's hooked up wrong as it worked perfect for 3 months then just stopped. And also I dont think it's the BOV because i can hear it letting the air out, even at low boost.

The problem is that it builds way too much. It throws a check engine light if I get on it.

Hopefully it's something small, but i will try all your suggestions.

Commence off topic :P

[Chemwarrior]

I'm sorry to highjack your thread but I have a similar problem that I need some input on. I get a lot of bov flutter when I mash the pedal in fifth gear. This only occurs in that gear. It builds boost fine but as soon as it reaches around 23 psi it starts to flutter. I have taken apart my APS bov to lube it and put some tephlon tape on the adjustment screw to see if that would help, but it didn't. Currently the adjustment screw is showing about four threads. Any suggestions?

[shunderwunder]

May be adjusted too loose. When I had my APS I had the set screw even with the lock nut. Not sure it that will help any, but I never had any issues with it & it held boost great.

[Chemwarrior]

Thanks for the input Andy. I'll try adjusting it.

[shunderwunder]

No problem. Hope it werks

[GoBoost]

Fixed my boost problem! And it only cost $1.88 for a 5 pack.

Checked around under the hood again and noticed in the back (coming from the end of the UICP) there was a missing line on the vacuum hose connector. We only had T connectors when we connected them up, so i wasnt sure if it was supposed to be a cap, or a line. I looked everywhere, and didnt see one. So i went to the store to buy a plug. This is the same line that runs into the boost controller.... So when the boost controller was trying to read the boost, it was all leaking out to atmosphere, so it let it keep boosting. plugged it up and presto! im an idiot.

[shunderwunder]

Use a tie wrap if you got one to hold the cap on so it doesnt happen again. I'm sure you had one to begin with, but it slipped off.