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Old 05-10-2017, 09:07 PM   #26
VolvoPrince
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Well today I tried to drive the car up a hill... It was boosting around 2psi and it was so slow that I had to throw on the hazards and let people pass. Maybe 30mph tops. Could I have a fuel problem maybe?
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Old 05-11-2017, 03:16 AM   #27
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Have you checked pressure at the rail? I don't know if low pressure would limit boost but it would limit RPM. One of my buddies runs a newer v70R and said he had similar problems, turned out to be a boost pressure sensor.
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Old 05-11-2017, 03:28 AM   #28
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Also, can someone confirm my routing to the TCV? Red to compressor, blue to intake hose, yellow to wastegate, right?
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Old 05-11-2017, 12:41 PM   #29
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Have you checked pressure at the rail? I don't know if low pressure would limit boost but it would limit RPM. One of my buddies runs a newer v70R and said he had similar problems, turned out to be a boost pressure sensor.
I have not yet tested my fuel pressure from the rail but I plan to do it today. As far as a boost sensor goes, I'm not sure where mine are. Or if I have any. Could this be my problem and could anyone point me in the right direction as of their location on the car and how to troubleshoot them?
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Old 05-11-2017, 12:41 PM   #30
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Thanks. I guess I have that hooked up right!
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Old 05-11-2017, 01:11 PM   #31
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Something else also just kind of hit me last night. My car has the resistor mod done for the secondary air pump system in the ECU, as I found out when I went to go do it myself last week. Since I saw the resistor I just put the ECU back in. Last night I was getting a code pertaining to the secondary air pump... Which I shouldn't be getting with the mod done. Part of me wonders if the mod could somehow be affecting my ARD tune. If it wasn't accounted for when the tune was made wouldn't it mess with my system? Possibly limiting boost?
Interesting possibility...I'd see if you can find someone with a 98 x70T5 or V70R ECU to loan you to see if that is the root of the problem. Try asking on Volvospeed or Swedespeed.
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Old 05-11-2017, 01:59 PM   #32
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The SAS mod/fault shouldn't limit boost, my '98 XC still boosts fine with the pump disconnected/no mods to the ECU.

'98 cars don't have a boost pressure sensor or fuel pressure sensor.

I would suspect fuel pressure, the MAF, or a clogged cat at this point. Did you replace the fuel filter as part of your stage 0?
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Old 05-17-2017, 12:57 AM   #33
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Solved everyone! Clogged cat, that's all it was. VERY clogged cat. I got it fixed today, but I'm still struggling to fix my P0505 and P1505 codes. Both have to do with my IAC. I have replaced it 3 times and nothing has helped. The car idles too high when warm, and I'm thinking its a wiring problem. The PO had the IAC connected directly to the negative terminal on the battery, which didn't help anything, but I re wired it back into the original harness. I'm wondering if the harness has an issue somewhere. Maybe not getting 12v? If I run 12V to the IAC from the battery, might that slove my problem?
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Old 05-17-2017, 09:45 AM   #34
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Are you sure the TPS and IAC plugs aren't switched? They're close together and the same size.

I wouldn't try running power directly to the IAC.
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Old 05-18-2017, 12:10 AM   #35
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Not switched, just checked. I think I might make another thread just regarding the IAC codes.
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Old 05-18-2017, 11:08 AM   #36
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If I run 12V to the IAC from the battery, might that slove my problem?
Sounds like more hackery. Repair the wiring harness.
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