No boost......

**lostInTheSmoke** · 02-26-2016 04:00 PM

So recently I changed my diverter valve because I threw a code p0299 and the diverter valve is bad. So I change that and I had great boost pressure probably around 20psi. But now as of a few days later I'm having little to no boost pressure. If I get to around 4000 rpms it will jump up to about 12 psi all of a sudden, but if I'm driving normal I'll barely hit 3 psi. I did leak test and had zero leaks. Where do I go from here? Please help.

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**Denio24** · 02-26-2016 04:13 PM

Maybe your boost gauge isn't functioning properly. Do you feel the boost come on and off like the boost gauge is showing? Or is what you feel different from what you see.

**lostInTheSmoke** · 02-26-2016 04:26 PM

I can feel the boost come on when the gauge shows, it's low but then when I get high on the rpms it's like a surge and then I hit like 12psi and can hold it there if I keep on the throttle.

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**Schweini** · 02-26-2016 04:45 PM

Ive had someone local to me have similar issues, and upon inspecting his install, he totally screwed up the DV positioning, leaving a big gap.

Did you double check that at all?

**lostInTheSmoke** · 02-26-2016 05:01 PM

Originally Posted by Schweini

Ive had someone local to me have similar issues, and upon inspecting his install, he totally screwed up the DV positioning, leaving a big gap.

Did you double check that at all?

Yeah when I put it in I made sure it was fully in and tight. When I did a pressure test it would leak from the DV if it wasn't in all the way right?

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**Schweini** · 02-26-2016 05:28 PM

Yea I would assume so, depending on the positioning of the Dv, if it was stuck open or not. But you said there's no gaps so id check elsewhere.

Have you checked your PCV and Cam follower lately?

**lostInTheSmoke** · 02-26-2016 06:01 PM

Originally Posted by Schweini

Yea I would assume so, depending on the positioning of the Dv, if it was stuck open or not. But you said there's no gaps so id check elsewhere.

Have you checked your PCV and Cam follower lately?

Did the PCV like a month ago, but I really need to look at the cam follower now that you mention it, but haven't heard anything from there but fingers crossed.

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**lostInTheSmoke** · 02-27-2016 05:10 PM

So just too a look at the cam follower it was still looking good but replaced it anyways that I had the pump off. Still same boost problem,
[IMG]https://uploads.tapatalk-cdn.com/20160228/00e465be9b12b16f29cdf4e38f30bb24.jpg[/IMG

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**lostInTheSmoke** · 02-27-2016 06:44 PM

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**zagimon** · 02-29-2016 12:08 PM

What year is your B7 and how many miles are on it?

**lostInTheSmoke** · 02-29-2016 01:41 PM

Originally Posted by zagimon

What year is your B7 and how many miles are on it?

2005 with 170,000

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**lostInTheSmoke** · 02-29-2016 01:44 PM

I think I'm going to pull the DV back out and look at that, it's the new piston style and heard some bad things about them. If not look at the N75 valve.

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**lostInTheSmoke** · 03-27-2016 12:38 AM

Update.... it was the DV it was stuck open. Greased it up cleared the code BOOST ON

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**Okedokey** · 03-27-2016 04:06 AM

Thanks for updating mate.

**Schweini** · 03-27-2016 09:57 AM

Originally Posted by lostInTheSmoke

Update.... it was the DV it was stuck open. Greased it up cleared the code BOOST ON

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good stuff

**zeitmorder** · 03-27-2016 02:03 PM

Was the DV the updated piston style or the diaphram? Also, 170k miles. Wow. Greating seeing these cars lasting this long.

**kTaLgsTo** · 03-27-2016 04:13 PM

Same thing happened to me, except my piston style diverter valve exploded. I contacted JHM (where I got it from) but they never responded. Part was out of warranty anyways, just wanted to know if the piston style was having issues...