[200q20v] Oxygenated fuel

[Phil Rose]

At 7:39 PM -0800 1/28/02, Derek Pulvino wrote:
>Mileage has been low as of late, and at first forgot about the subject line.
>  So gladly before I was up to my ears in troubleshooting, the cause of my
>low mileage was revealed.
>
>But...
>
>Has anybody seen oxygenated fuel to also result in lowered boost levels?
>I'm only seeing 1.3 to 1.4.  Yuck!
>
>Culprits I'm thinking right now (translate: things I know aren't 100%) are
>tbv, multi-temp sensor, and a recurant (and intermitant) intake air-temp
>sensor fault.  No vacuum leaks encountered, air filter is good/clean
>(enough), and for the most part intake/pressure hoses only have two holes;
>those included in the manufacturing process.  While I haven't checked the
>throttle potentiometer, I have reason to believe it's ok.
>
>Any suggestions, or feedback on any of these points?

You haven't mentioned the  wastegate frequency valve. That should
surely  be added to your list of "usual suspects".  Of course proper
operation of that intake air-temp  sensor is crucial for max boost
and it ought to be fixed before proceeding to other replacements. If
you _know_ that the TBV "isn't 100%" I assume that is because the
valve (or its hose) leaks, so that probably is contributing to the
low boost.

Phil
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*  Phil & Judy Rose           Rochester, NY  *
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