Friggin' MFTS...again!

Brett Dikeman brett at
Thu Dec 19 12:05:00 EST 2002

At 10:51 AM -0500 12/19/02, Kneale Brownson wrote:

>>I seem to go through them every 12-18 months.  Usual failure mode for me is
>>the Temp gauge and A/C quit working. I never have seen low boost caused by

Then you don't have a MFTS failure.  Perhaps that's why you keep
"going through them."  If the A/C stops because of the MFTS, the very
same signal goes to the ECU to kill the wastegate frequency
valve(1.2-1.3 bar tops unless modified.)

>>  The last one was throwing false over-temps and no A/C. I knew the over
>>temps were false because I would start the car at 5 deg and in less than a
>>minute, an over-temp alarm. I don't think so!

I got the same thing a couple of days ago.  Low coolant level.  Have
you considered a dash problem, or a faulty connector for the MFTS, or
other wiring problem?

>Could I get reduced boost (up to 1.5 on the OEM gauge, at WOT up hill in
>third and fourth) and no cooling from the A/C from this?

The low boost is wrong, unless you have modified the
wastegate(misadjusted or changed spring.)  It should be about 1.2-1.3
if the MFTS is sending a false-overheat.  Lack of A/C operation is
not necessarily MFTS

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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