All of a sudden, after shutting my car off, I started it back up, and now I can't boost past 4-5 psi. No CEL. I checked all the lines from the BOV and turbo and everything seems to be properly intact. I can tell its not the gauge because the BOV is noticeably softer. Car otherwise accelerates normally with no stutter. Only thing I could come up with off the top of my head is possibly the boost control solenoid. Ideas?
Boost leak most likely. Many possibilities. Are you stock TMIC? If so check the y pipe under it....its a culprit.
Yes, it is stock TMIC. I reckon I'll head down to the shop and dissect it. A couple of guys over at NASIOC suggested it may be a wastegate issue. Possibly stuck open.
both are possible. Where are you reading the boost pressure from? Wastegate spring pressure is around 7ish psi isn't it?
WG could be issue too. There are many variables but check all the boost tubes. The first thing I would do would be a boost leak pressure test.....if theres a leak you will definitely hear it. http://forums.nasioc.com/forums/showthread.php?t=2205161
Just took the heat shield off. Retaining clip is intact. Movement and return of the arm seems normal. Replaced gasket from BOV to TMIC. All hoses and fittings are intact. Will drive and see.
I have a bluetooth scan tool that has the ability to read boost, temperatures, HP/Torque, RPM's and such. The boost readings are spot on with the gauge. I pulled the heat shield off and the waste gate arm is intact. Checked all hoses and none are torn or cracked. I replaced them all when I put the new motor in last December. I have since put about 30,000 miles on it. Like I said, it happened after I turned the car off. I shut it off, and about 5 minutes later, turned it back on, and that is when I noticed the reduction in boost. No CEL. No abnormal noises from the turbo. I'm beginning to think it's the solenoid.
I'm trying to sell my HKS so that I can go back to OEM. Although I do have the adapter to go full recirculation. I reckon I'll try that first.
Full recirc won't help if it's leaking. Aftermarket bov's are notorious for leaking. Had a Greddy myself that leaked only after 14psi, even completely tightened down. You should be able to find a stock BPV around somewhere for cheap or free.
yea, could be the actual diaphram in the HKS, in which case, you'd be selling someone a paper weight. This is all speculation of course, only way to test is to either pressure test the system or swap on the stock bpv. Ask AllPro for help.
I filled it slap up with gas this morning and 15 miles down the road it started running fine. 12-13 psi. Bad gas maybe.
Bad gas wouldnt have anything to do with your car not creating the target boost pressure. Like others have said I would check the BOV. I am sure if you ask around someone here has a spare one they would let you borrow or buy cheap.
I didn't think that would cause it to do so either, but sure as shootin, as soon as I filled her slap up this morning, she went back to normal.