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2010 MCS (74K miles, auto) - Stock boost?

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2010 MCS (74K miles, auto) - Stock boost?

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Old 03-02-2018, 12:18 PM
Ketchup
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2010 MCS (74K miles, auto) - Stock boost?

Hi all.
I have seen different numbers on what the stock boost should be. I have a ScanGauge and it shows maybe a maximum of about 9.5psi under heavy acceleration going uphill (not floored, though).

What should I be seeing with it? Just wondering.

I'm also seeing blue smoke after extended idling in traffic (after about 15+ minutes), then it goes away after the traffic starts moving. Read this might be the valve seals. 1qt every 1000 miles (I check and add every weekend and oil changes @ 4K miles)

Thanks.
 
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Old 03-13-2018, 07:47 AM
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I bought this car with 53K miles on it. 75K miles now so I decided to replace the plugs this past weekend. I guess they were in bad shape (they looked a bit worn).

Now I get 14.1 PSI! Crazy how a new set of plugs changed things. So smooth now and power! Took all of 18 minutes to replace them. Super easy and cheap. Of course I had to buy that 14-point thin wall socket and a nice torque wrench.
 
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Old 03-13-2018, 08:41 AM
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Yeah, the turbo is powered by the exhaust, so a weak burn will result in a weak turbo - double whammy!
 
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Old 03-14-2018, 02:12 PM
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So this is goofy. It seemed to work great for about 2 days...now back to lower boost. Perhaps something else is wrong or something is intermittent.

Any ideas?
Thanks.
 
  #5  
Old 03-16-2018, 12:42 AM
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Maybe a failing wastegate? It could be seating properly at times, but not closing fully at other times. Just a guess......
 
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Old 03-16-2018, 02:28 AM
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+1 on the failing wastegate. Mine had intermittent low boost issues accompanied by a "reduced power" light on the tach. After replacing multiple components it ended up being a worn out wastegate. The shaft wears through the exhaust housing causing it to bind.
 
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Old 03-16-2018, 07:07 AM
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Originally Posted by S-2013 View Post
+1 on the failing wastegate. Mine had intermittent low boost issues accompanied by a "reduced power" light on the tach. After replacing multiple components it ended up being a worn out wastegate. The shaft wears through the exhaust housing causing it to bind.
So the only fix on this is to replace the turbo, correct?

Thanks
 
  #8  
Old 03-16-2018, 08:39 AM
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Some vendors sell the exhaust housing separately with the attached wastegate assembly. I replaced the whole turbo and oil lines due to high mileage -130K. Remove your pre-cat O2 sensor to observe the wastegate operation using an inspection camera and vacuum pump.
 
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Old 03-16-2018, 08:45 AM
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With the engine cold, can I actuate it by hand or would that damage something? Just to see if it's sticky...perhaps actuating it by hand a few times may make it move a bit better?

Just wondering.

Thanks for all of the help!
 
  #10  
Old 03-16-2018, 08:59 AM
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Maybe, (on a cold engine) remove your heatshields to check the wastegate lever for play. Here a video of mine once removed:
 
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