Stumble w/Throttle - fixed; was MAF
Kenneth
auditude at cox.net
Sat Sep 27 18:15:45 PDT 2014
So I swapped in a different MAF sensor and the stumbling I was having seems
to be gone now. I can now accelerate smoothly and it seems to be alright.
I'll have to drive it more regularly now and see how it goes. I have to
tackle the a/c, so it doesn't take much for me to drive something else.
When it started stumbling I had for a while been running a cone filter on
the end of the MAF that quit working, no airbox. The sensor wire looked
intact and I couldn't tell anything was wrong with the MAF, except maybe for
a crack or two inside the housing on the stem for the little "bubble blower
wand looking thing" that looks like it samples the air in the middle of the
housing. Perhaps that crack is part of what is wrong with it. Or, of
course perhaps I damaged it with my cone filter, which is the oiled type but
did not appear to be not over-oiled.
This time, I put the airbox back in. I lost the loud APR R1 bypass valve
noise and intake sounds, which I rather enjoyed. I prefer those noises up
front to go with the Stromung song out back, even if I was maybe sucking in
warmer air than with the airbox, so I may try it again with a oil-less cone
filter like the AEM Dryflow.
I only drove it for a bit, but it might be the first time I've driven it
without something messed up since putting the RS2 turbo/EM and 7A cams in.
It doesn't really wake up until almost 4k and then it scoots pretty good.
I couldn't find the new MFTS that I have laying around somewhere, so I
swapped in another old one, 3-pin version, that was in the loose coolant
manifold from a donor motor I have. I didn't know if it was bad or not, but
I still don't have a coolant gauge. I did have the cluster apart to put in
some urS4 gauge faces, but I seem to recall the coolant gauge wasn't working
even before that I think I tried both my original and the urS4 actual gauge
with neither working. I'll have to find that MFTS or get another piece of
crap one that will only work for a little while... Unless there's been any
improvements on them since I last heard?
Speaking of the urS4 gauge faces, they are noticeably dimmer at night than
my originals. I think brighter bulbs may be in order. Do you folks know if
the urS4/6's had brighter gauge backlight bulbs than 200's did?
Thanks,
Kenneth
-----Original Message-----
From: Kenneth
Sent: Sunday, September 21, 2014 10:45 PM
To: 200q20v at audifans.com
Subject: Re: Stumble w/Throttle
Thanks for the replies. I unplugged the MFTS and while the behavior seemed
better somehow, some stumbling was still there. It needs replacing, again,
anyway.
I'll try a different MAF sensor next and see if that does anything.
Kenneth
-----Original Message-----
From: Phil Rose
Sounds similar to symptom my '91 200q had all this summer. It finally threw
a code indicating a problem with the MAF sensor. I checked all sensor
connections and finally removed the sensor and saw a broken wire. I replaced
with a used MAF sensor and problem solved.
The temp gauge issue is possibly our old nemisis, the MFTS. That would also
affect engine running, but not a stumble problem, AFAIK.
-----Original Message-----
From: Kneale Brownson
Disconnect the multifunction sensor hanging below the coolant manifold. May
be a bad sensor.
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