94 850 Turbo Boost Issue
#1
94 850 Turbo Boost Issue
I recently started having a problem with having boost at times and others none. I started by going thru replacing vacuum lines which I did find that all the ones that go to the BCS were cracked or totally broken off. Before I replaced all the vacuum lines I was having an over boost issue at times where if I hit the accelerator hard it would over boost and then lose all power for a second or two.
Since I have replaced all those lines I get little to no boost to where the turbo gauge barely goes into the white and not as much power. I have gone thru and checked all the hoses and all are tight and no tears. I also checked for codes and on A2 I got 414, 543, 455, 231, and 443. I went ahead and cleared them and still acts the same. I checked it today after I drove it for 50 miles and no codes have come back.
I also followed a suggestion to test the turbo by removing the wastegate hose that goes to the BCS. After I did that I got boost no problems. I have tried another BCS that I borrowed from friends 850 and still giving me the same issues. This has had me stumped for days tearing everything apart over and over again and rechecking things. I hope someone might know what's going on or have some suggestions.
I was also wondering if in the meantime it's safe to drive the car with the hose off that goes from the wastegate to the BCS till I figure out what the cause is?
Since I have replaced all those lines I get little to no boost to where the turbo gauge barely goes into the white and not as much power. I have gone thru and checked all the hoses and all are tight and no tears. I also checked for codes and on A2 I got 414, 543, 455, 231, and 443. I went ahead and cleared them and still acts the same. I checked it today after I drove it for 50 miles and no codes have come back.
I also followed a suggestion to test the turbo by removing the wastegate hose that goes to the BCS. After I did that I got boost no problems. I have tried another BCS that I borrowed from friends 850 and still giving me the same issues. This has had me stumped for days tearing everything apart over and over again and rechecking things. I hope someone might know what's going on or have some suggestions.
I was also wondering if in the meantime it's safe to drive the car with the hose off that goes from the wastegate to the BCS till I figure out what the cause is?
#4
#5
#6
Well I finally got my silicone lines in from IPD. I changed all the lines in the car to the silicone ones. I did see a bit of a difference but it would only give half or less of boost. I had one time to where it gave me full boost but after that I now get no boost at all. I did check my turbo and it's not lose and spins freely with no problems. Any suggestions?
#7
So I did some more digging after trying another BCS again from a friends 850 and still no luck but I did find that the plastic hose coming from the PCV to the intake was broken in multiple places. I plan to replace it hopefully this week as long as I can get enough time to do it since I know from my V70 how time consuming it can be.
Would that cause enough of a vacuum leak to give me the issues i'm having?
Would that cause enough of a vacuum leak to give me the issues i'm having?
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