Bypassing the the bypass valve solenoid.
- Thread starter MPFab
- Start date
MilehighSonic86
New member
Sweet lol lol thanks preloader!
sx sonic
New member
So I took some work in the city, 70 miles North of where I live, most of the drive is 4 lane highway thru residential and commercial areas, lots of lights. So lots of on and off the throttle and shifting, and during rush hour lots of break neck acceleration to keep up with the average throttle jockey.
I'd been running the stock BPV lines for awhile and noticed that often while driving in these conditions that throttle tip in behavior just felt funky. During shifts and sometimes taking off it felt weird and my throttle control seemed off.
I attributed it to my work boots making me ham fisted with the throttle and clutch. BUT after bypassing the BPV solenoid everything seemed more natural and I felt like power delivery was acting more as expected/naturally.
I believe I didn't notice as much of a change with the bypass mod before because my drive cycle was more linear, I was either on or off the throttle and my shifts longer. Now with the hustle and bustle of actual city traffic driving the BPV solenoid is more active and noticeable.
I'd been running the stock BPV lines for awhile and noticed that often while driving in these conditions that throttle tip in behavior just felt funky. During shifts and sometimes taking off it felt weird and my throttle control seemed off.
I attributed it to my work boots making me ham fisted with the throttle and clutch. BUT after bypassing the BPV solenoid everything seemed more natural and I felt like power delivery was acting more as expected/naturally.
I believe I didn't notice as much of a change with the bypass mod before because my drive cycle was more linear, I was either on or off the throttle and my shifts longer. Now with the hustle and bustle of actual city traffic driving the BPV solenoid is more active and noticeable.
Just a heads up, my dealer tech that looked over the car, they claimed that my PCV routing had been changed and part of it deleted and capped off. They were referring to this mod. I have no idea how these lines would be related to the PCV but that is what they said. I'm not sure if it is the dealer or the tech that was looking at my car but someone is not too smart.
I had taken it in for excessive oil consumption and they replaced the valve cover since it was leaking. They claim that the cause was improper pcv lines and returned them to stock.
I have no confidence in the Tech that looked at my car. They did a compression test and it passed. However, when I pulled the spark plugs there was oil on them before my trip to the dealer and afterwards as well. My understanding is that if a engine fails a compression test, then you try to add a drop or two of oil and check again, if it then passes, then the rings are worn. I'm believing that I have worn rings that are causing the excessive oil consumption but the tech obviously forgot that my car was in after drinking 3L of oil.
This tech also could not find the boost pressure sensor on my car's hard pipes. I personally had to point out that it was in the same position as stock...
Italianjoe1
Member
Finally took a few minutes today to do this. In my view if you wanted to, you could connect the long line directly to the manifold, it would twist the elbow on the end a bit but it should still work. I capped the solenoid and added a longer piece of hose onto the hard line, re-using the stock larger clamp from the elbow piece. Gonna see if I notice any changes, not expecting much since it's auto but still every little bit helps when drivability is concerned.
Trevinator
New member
I just did this to my 2014 and it felt like the boost was smoother, came on sooner, but felt like it had less power around 4000 rpms. I put it back to stock because I like the feel of the car when the boost comes on. this is with the trifecta budget tune btw.
wasteoffilm
Member
Does this disable ECO mode on Select-A-Tune?
Anyone dyno this yet?
Anyone dyno this yet?
sx sonic
New member
It does not disable eco mode.
MPFab was going to dyno test it but his clutch was acting up (to much powwa) so he postponed going to the dyno.
Sounds like he's got a new clutch so hopefully soon he'll make some runs.
To start off the only mod i have done to my sonic is painted my Chevy bow ties black, so yes I'm bone stock,. I did this mod today. And has better response and is smoother like everyone one on here says. Not really much of a difference either way but since it cost near nothing its worth trying especially since it literally took me five minutes, i have little hands don't judge me. Will be getting an intake soon anyways. waiting on the orange color Mpfab 
Yosemite Sam
I Hates Rabbits!
Welcome to the small hand club!! It wasn't too hard to get my little paws in there.
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Sonic_Boost
New member
Finally got around to getting this done this past weekend and i wish i didnt wait so long. Shifting during boost is sooo much smoother now.
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Blue Moon Sonic
New member
I will definitely say that it is much easier doing this mod while you're porting the intake manifold since you don't have to squeeze your hands into a small limited space and since the manifold is already out you can just remove the original vac line and extend it out with 3 inches of vac line hose and a 5/8 T for when you decide to install a boost gauge. Definitely will agree that it does help with the over all power curve and allows for smoother shifts while under boost.