Something Weird Going On

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03-22-2018, 02:13 PM

#21

Gravzy

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Join Date: 03-21-2018

Location: Maine

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Quote:

Originally Posted by donbrew

If the CEL is not on stored codes mean nothing. Go ahead and clear them unless you need an emissions within a month or 2.

P0507 is a Type B DTC

Thank you donbrew. I will clear the codes and see if they come back. Do you think back on my first issue that I should be looking at the bypass solenoid due to its only noticeable on deceleration?

Last edited by RJ_RS_SS_350; 03-22-2018 at 04:23 PM.

03-22-2018, 02:15 PM

#22

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Quote:

Originally Posted by RJ_RS_SS_350

Don't fall for lower priced thermostats, get the OEM - Thermostat - (2006-2011 All Models)
ACDelco 131-158 GM P/N 12622410

Thanks RJ RS SS 350, I did read on that post you sent me that if you cheap out you will be doing it again. I will be sure to with that one.

03-22-2018, 05:28 PM

#23

RJ_RS_SS_350

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I'm going to guess that it has something to do with DFCO. Here is a good post by JoeR about it. https://www.chevyhhr.net/forums/2-4l...e2/#post293975

03-22-2018, 06:38 PM

#24

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Quote:

Originally Posted by RJ_RS_SS_350

I'm going to guess that it has something to do with DFCO. Here is a good post by JoeR about it. https://www.chevyhhr.net/forums/2-4l...e2/#post293975

that my friend is the closest I’ve seen thus far to what it may be. This bit is what I found interesting,
• During an extended, high speed, closed throttle coast down--This reduces emissions and increases engine braking.

Doesn't have to be that long (3 sec. noted above), nor high speed. Yes, it does reduce emissions (no gas = no emissions). Engine braking is enhanced. On a manual trans you can actually feel when the DFCO kicks in. Helps ecomomy, too, since if you aren't putting any fuel into the engine...

I wonder if with one of the sensors that help control that like the MAF, TPS or MAP is dirty or going bad that it would intensify the feeling which is why it feels like a hiccup. I’m going to try this weekend to clean the MAF and see if it calms it down. I’m also going to check for vacuum leaks because I ran a smog test with my scanner and there is a fault with the EVAP system so in hopes with this information and the cleaning and the checks I can tone it down but knowing I will most likely feel something eases my mind some. Thank you so much RJ RS SS 350.

03-23-2018, 02:03 PM

#25

Cat Man HHR

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Quote:

Originally Posted by firemangeorge

An FYI. Our car's have a BPV (bypass valve) not a BOV. They also do have a wastegate.

Bypass valve and wastegate are the same animal. If your talking inside the turbo itself.

03-23-2018, 02:41 PM

#26

RJ_RS_SS_350

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Quote:

Originally Posted by Cat Man HHR

Bypass valve and wastegate are the same animal. If your talking inside the turbo itself.

Not the same at all.

03-23-2018, 10:00 PM

#27

firemangeorge

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My old stock BPV that has been replaced with the Forge Motorsports aluminum one.

03-24-2018, 04:02 AM

#28

Cat Man HHR

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I stand corrected.
Worked on too many turbo engines that didn't have the bypass valve like the ones pictured. Caterpillar turbo's have a wastegate only and some people would refer to it as a bypass valve also.