17/22 no boost issue

Well I'm sure it has to do with vaccum but I was wondering if someone could point me in the right direction. Car has a really low exhaust rumble and seems down on power. Gauge shows no boost. If you turn it off and restart it, boost returns. What's wrong? N75 valve is around a year old.

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It's going into limp mode. Do you have a check engine light

No CEL. It had done this before but had stopped then just started back yesterday. Funny thing is it happens on every other start up. Basically I start it pull out and hear the low rumble , like the veins are fully open, then the loss of power because of no boost. I then try and get it up to a decent speed and shut it off, pop the clutch and then boost returns. Everything is as it should be until the next start up.

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sounds like limp mode.. Check your hoses for leaks, and cracks. Do a log with vcds of channel 08 and 11 at once. Also 01, 03 04 can help. Create a excel file of 08 and 11 and Look for requested boost vs actual, good place to determine if your turbo is spiking, or perhaps a boost leak issue.
Most of the time this is a good place to start, you mentioned you replaced the n75 valve any chance the vacuum line is leaking?

I put all new vaccum hoses on at the same time. Replaced them with McMastercar silicon hoses. I did delete a few of the hoses because I deleted the egr anti-shutter and vaccum bulb. Basically I have the vaccum pump to the N75. The check valve and the air box hook up. I did this as per a diagram from this site just to clean up the engine bay because they weren't being used anymore.

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dieselboy04' said:

No CEL. It had done this before but had stopped then just started back yesterday. Funny thing is it happens on every other start up. Basically I start it pull out and hear the low rumble , like the veins are fully open, then the loss of power because of no boost. I then try and get it up to a decent speed and shut it off, pop the clutch and then boost returns. Everything is as it should be until the next start up.

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That sounds like an intermittent sensor problem detected by the ECU at key on. This won't always turn the CEL on, but it will set a DTC. You need to read the code and go from there.

Simon

Thanks I'll scan it in just a sec and see what turns up.

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No code at start up this time. But it also didn't do what it's been doing either. But you'd think it'd store a code

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Checked a few more times when it happened again. Still no codes.

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