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  #1  
Old 12th April 2006
TheatreTechie TheatreTechie is offline
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Location: Berwick upon Tweed UK
My Saabs: NG900 - 95
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Default Turbo Overboosting Problem

Hi

I have just finished work on changing my cylinder head gasket on my NG900 turbo, ive rebuilt everything and upon intial starting the engine seemed ok.

However when driving it under full throttle the boost goes into the red the engine seems to pull/hesitate/pull.

I have checked the connections on the BPV and check that the Compressor - Wastegate link isn't blocked?

In removing the exhaust manifold from the head I had to disconnect the wastegate from the actuator and it may be slightly different, but couldn't be much.

The BPV was working fine before cylinder head was fixed (or so it would seem).

Anybody any ideas how I can control this overboosting?...
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  #2  
Old 12th April 2006
Ryan33 Ryan33 is offline
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you can try running an mbc...that worked for me when i had an overboosting problem...you could also try unplugging everything from the bpc and just run a line from the turbo to the wastegate to see what your base boost setting are...


but an mbc would help the overboosting problem...
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  #3  
Old 12th April 2006
PMI PMI is offline
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You can also try cleaning the BPC valve (I assumed that is what you meant) with compressed air. If some dirt got dislodged when the work on the head was done, it may have blocked one of the ports inside the valve.

http://www.saabcentral.com/forums/sh...ad.php?t=58756
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  #4  
Old 12th April 2006
Ryan33 Ryan33 is offline
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yea you can try that to, wd40 should lube it up and then compressed air will blow all that dirt and junk etc, etc, etc, out...
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  #5  
Old 16th April 2006
TheatreTechie TheatreTechie is offline
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Default Problem Sorted.Thanks...

Hi

Thanks for your replies, am looking at the MBC as a possible performance mod in the near future thanks for all your help!.

Turns out the problem was being caused by a incorrectly gapped spark plug, one cylinder mustn't have been running properly and was causing my problems.

It's always the little things!!

After head gasket replacement all seems to be well.. All the vacuum hoses died and have had to be replaced.

Head needed .007" taken off due to warping. The cars done 148,000 miles there was not even a little wear to the bores. Pistons and Cylinder head spotlessly clean very impressed! Saab know how to make an engine.

Cheers


Neil
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