[s-cars] New MAF tested to fix stumble / low boost issues

[Mark Strangways]

Did you reset the ECU after putting in the new MAF ?

Mark
----- Original Message -----
From: "Walsh, Edward" <edward.walsh at agedwards.com>
To: <wmahoney at disk.com>
Cc: <s-car-list at audifans.com>
Sent: Thursday, April 24, 2003 2:37 PM
Subject: [s-cars] New MAF tested to fix stumble / low boost issues


> Bill/List,
>
> I installed a loaner MAF (thanks for the loan BILL M!) last night.  On the
> way into work this AM, the car was seemed smoother, etc.  Alas, the boost
> did the same thing (shoots to 16, then slowly creeps to 20 - fluctuates
> along the way - every other MTM 1+ car that have driven would shoot to 22
> PSI, and back off from there).
>
> The good news is the engine didn't stumble at all.  I don't feel I have
> enough miles on the car with Bill's MAF, so I can't say for certain that
my
> MAF was/is bad.  In the past, with the my MAF installed, the car would
> stumble sometimes/sometimes not, though it was hard to predict when.   So,
I
> am guessing my MAF is weak/bad, and Bill's is good... But I still am
having
> a problem somewhere else with my boost.
>
> (maybe this will be useful for the archives)  Back to the list:
>
> 95 S6 with 83k - MTM 1+ ECU
> - Plug connectors all have 5K ohm resistance (swapped in known good
> connectors - same problems)
> - ECU is good (swapped in known good ECU - same problems)
> - Hoses are tight/secure
>  - Plugs are good (swapped in known good plugs - same problems
> - WGFV is good (clicks during diagnostic test)
> - Coil pack is good (swapped in known good Coil Pack) - same problems
> - Idle is smooth
> - New O2 Sensor
> - Turbo is quiet
> - Waste Gate is not torn, slides smoothly up and down with no radial play
> - Power is smooth until about 1.2 bar
> - Miss is subtle, but prevents boost from hitting 22-23 (MTM 1+) in all
> gears.  Boost is lower as the gears are higher (2nd gear will hit 20 PSI
> right away 5th gear goes to 17 then creeps to 20/21 over the span of 5 or
so
> seconds), Miss is worst when accelerating hard at hway speeds, after
> coasting in heavy vacuum for a while (like slowing for traffic on a 2 lane
> road, downshifting from 5th to 4th, then overtaking on the left) - Motor
> will over boost to 28+ PSI if floored at low RPM (<2,500) in 3/4/5 gear.
> When boost is that high, the motor makes a different, very rapid
"thumping"
> noise. ECU will sometimes bring boost down to safe levels, but sometimes
it
> won't, and only my right foot prevents a grenade.
>
> Any more Ideas? Anyone have the pn for a WGFV
>
> Thanks a million, Ed
>
>
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