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Turbo boosting late at 3,000 RPMs and black smoke coming from the exhaust

Tiny
VWGOLF08
  • MEMBER
  • 2008 VOLKSWAGEN GOLF
  • 2.0L
  • TURBO
  • 2WD
  • MANUAL
  • 138,000 MILES
Recently I put in a new hybrid turbo and engine after the old turbo broke after a remap. Not the new turbo boosts late at around 3000 rpm and there is a lot of black smoke from the exhaust when the turbo spools/boosts.

The actuator and MAF sensor seem fine what else could be the issue. Could it simply need a remap once again?
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Sunday, June 26th, 2022 AT 10:24 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
It sounds like the new turbo is bad, can you check the turbine endplay to confirm? This guide can help:

https://www.2carpros.com/articles/how-turbo-chargers-work

Are there any codes in the car, please follow this guide as well?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.
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Monday, June 27th, 2022 AT 9:33 AM
Tiny
VWGOLF08
  • MEMBER
  • 4 POSTS
The turbo just got put in recently and we've had a look at it and there's no issues with it at all. Also, it's not throwing up any codes either. Struggling to understand what the issue could be.
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Monday, June 27th, 2022 AT 10:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
How did the engine run before the last turbo went bad? Does the engine have good vacuum at idle? Is the new turbo stock? If not, you may need to remap it. I would remove the spark plugs to see what they look like. You can upload the pictures in your response.
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Tuesday, June 28th, 2022 AT 10:58 AM
Tiny
VWGOLF08
  • MEMBER
  • 4 POSTS
The original engine ran away when installing the new turbo. I've got another engine in now, it's a diesel car so, doesn't have spark plugs. I just checked and tried another vacuum solenoid box on the car, but it's made no difference.
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Thursday, June 30th, 2022 AT 7:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
Let's run the codes to see what comes up. Here is a guide to help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.
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Friday, July 1st, 2022 AT 10:10 AM
Tiny
VWGOLF08
  • MEMBER
  • 4 POSTS
It's come up with a P0299 turbo charger under boost code.
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Friday, July 1st, 2022 AT 8:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
It seems like everything is pointing to a bad turbo or you have a clogged exhaust system, try to undo the exhaust at a point so it can flow freely and see what happens.
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Saturday, July 2nd, 2022 AT 2:50 PM

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