I have a ’90 Corrado G60, and I’ve been having some problems with the
trip computer. It always used to read about 24 mpg, but recently it started
reading about 35 mpg, and one day it read 99 mpg!!! Now it again reads
35 mpg. I checked to see if it was correct by carefully measuring the fuel
I pump in and the miles I travel. My results are 24 mpg, which proves that
there is something wrong with the computer readings.
The way I ASSUME it works is that the computer simply divides the miles
traveled from the odometer (which I’m sure is reading correctly) by the
amount of fuel comsumed (which I don’t know how it measures).
Does anybody happen to know what could be the cause of the error and how
that could be fixed?
Any help would be appreciated.
Rani.
- Hide quoted text — Show quoted text -
Rani Geha wrote:
> I have a ’90 Corrado G60, and I’ve been having some problems with the
> trip computer. It always used to read about 24 mpg, but recently it started
> reading about 35 mpg, and one day it read 99 mpg!!! Now it again reads
> 35 mpg. I checked to see if it was correct by carefully measuring the fuel
> I pump in and the miles I travel. My results are 24 mpg, which proves that
> there is something wrong with the computer readings.
> The way I ASSUME it works is that the computer simply divides the miles
> traveled from the odometer (which I’m sure is reading correctly) by the
> amount of fuel comsumed (which I don’t know how it measures).
> Does anybody happen to know what could be the cause of the error and how
> that could be fixed?
> Any help would be appreciated.
> Rani.
Rani, mine used to do that on occassion. the MFA reads a number of things to
compute fuel milage. with mine I had a loose connection and it did not read
the tach….try tapping the tach (GENTLY!) when it does it….
>amount of fuel comsumed (which I don’t know how it measures).
Actually not a "real number" for the ammount consumed, but a vacuum pressure
hose that measures the pressure. Check all your vacuum hose connections, as
they get old and dry out. They are SUPER cheap to replace, and on the older
cars (dunno about Corados) are partially linked to the vacuum assisted brake
booster (though with a different vacuum line) and can hurt braking power.
Replace a few little ends, and voila’ back to normal.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
"Distrust and caution are the|(formerly AT&T Bell Labs) Lucent Tech
parents of Security." | edward.w…@lucent.com
-Benjamin Franklin | ’89 Jetta GLI 16v ’84 Scirocco
In article <4q4huo$…@nntpb.cb.att.com>, Ed Wahl <ew…@lucent.com> wrote:
>Actually not a "real number" for the ammount consumed, but a vacuum pressure
>hose that measures the pressure. Check all your vacuum hose connections, as
>they get old and dry out. They are SUPER cheap to replace, and on the older
>cars (dunno about Corados) are partially linked to the vacuum assisted brake
>booster (though with a different vacuum line) and can hurt braking power.
>Replace a few little ends, and voila’ back to normal.
Aha! My ’89 GTI 16V has had this exact problem for several years, with the
MFA reporting 99 MPG all the time. I always assumed that fixing the
problem would be expensive, so I never did anything about it. Now my
curiosity is piqued, however. (And I certainly don’t want to be missing
out on any braking power, which already is marginal.) Now where exactly
are these vacuum hoses that I should be checking?
************************************************************
Lars Kongshem
http://www.access.digex.net/~norge/larshome.html
************************************************************
In <4q4r2k$…@access4.digex.net>
no…@access4.digex.net (Lars Kongshem) writes:
>In article <4q4huo$…@nntpb.cb.att.com>, Ed Wahl <ew…@lucent.com> wrote:
>>Actually not a "real number" for the ammount consumed, but a vacuum pressure
>>hose that measures the pressure. Check all your vacuum hose connections, as
>>they get old and dry out. They are SUPER cheap to replace, and on the older
>>cars (dunno about Corados) are partially linked to the vacuum assisted brake
>>booster (though with a different vacuum line) and can hurt braking power.
>>Replace a few little ends, and voila’ back to normal.
>Aha! My ’89 GTI 16V has had this exact problem for several years, with the
>MFA reporting 99 MPG all the time. I always assumed that fixing the
>problem would be expensive, so I never did anything about it. Now my
>curiosity is piqued, however. (And I certainly don’t want to be missing
>out on any braking power, which already is marginal.) Now where exactly
>are these vacuum hoses that I should be checking?
The tapping is off the brake booster vacuum line. If you had a RHD one,
I could tell you that they are prone to chafing through at the branched
check valve (the black and yellow bit with two small tapping coming off
it). The booster line "needs" to be replaced as a whole if this happens
– and they are not exactly cheap.
I don’t know about LHD, but the tapping would be similar. Trace the
line from the end of the inlet manifold until you get to the first
valve – and that will probably be the one with a couple of smaller
tubes coming from it on the booster "side" of the valve. The other
tapping goes off to the reservoir under your battery.
If the booster line and valves are intact, then you can be pretty sure
that the line to the pressure transducer on the back of the instrument
cluster is faulty. A simple test is to put your MFA into "measurement"
mode (the reading under "trip time" with the selection switch on "2" if
I recall correctly) with the ignition on – no need to crank – and
(yuck) suck on the line. The reading on the MFA should change, and if
you plug the line with some residual vacuum, the reading should remain
steady. If it varies, then you probably have a leaky vacuum line.
If the MFA indicates no change whatsoever, first make sure that the
line is connected to the back of the instrument cluster. You’ll
probably have to pull the cluster to be able to tell this for sure, at
which time you may as well test the transducer by using a short piece
of suitable tubing to repeat the test. If _that_ fails, the you can
start looking around for transducer — no need to replace the whole MFA
or cluster!
Read the relevant sections in the workshop manual before attempting any
of this and take suitable precautions.
—
Bernd Felsche {speaking for himself}
MetaPro Systems Pty Ltd, 130 Fauntleroy Avenue,
Redcliffe, Western Australia 6104
Phone: +61 9 479 3722 Fax: +61 9 479 3720
In a previous article, josh clark (jcl…@prolog.net) said:
> This
> road isn’t a good one to be speeding on either (rt15 in north NJ). He
> comes up again but I pull away surprisingly to me. Then one last time
> after about five minutes he passes me and tries to cut me AGAIN! That
> was it. It shot up to 85mph and BAM! A cop comes out of nowhere, gets
> me, gives me a $106 ticket, and the damn Camero gets away.
Challenge him to a re-match in Rt. 23! :-) You’ll enjoy watching that
Camaro slide off the road at 55 MPH. I used to have a blast on that road
with my old GTI 16V. Sadly, I haven’t had the VR6 out there yet…..
-Arthur
Maybe the Camaro was an undercover cop baiting you? Its happened before
to a friend in Connecticut. Its had to say whether NJ or Conn is worse
for generating their revenue from tickets….
Sorry. Don’t worry too much though, his Camaro won’t run for too long.
Tom
>>I was making my merry way home from seeing Dragonheart (the worst
>>movie I’ve seen in a LONG time)……..
Did you go to the same movie I went to?? It was awsome! The special
effects were out of anybodys league. (I smell an Oscar for the FX dept.)
Good plot, nice twist ect….
>>I pull up an follow him to find out what he was all about. I found out
in a >>minute when he gets next to a car in the right lane and doesn’t let
me pass! >>The sonabitch!
He’s got you beat already. Hes got your emotions in it. Your bound to
loose now…
>> Then one last time after about five minutes he passes me and tries to
cut >>me AGAIN! That was it. It shot up to 85mph and BAM! A cop comes
out of >>nowhere, gets me, gives me a $106 ticket, and the damn Camero
gets away.
See, he won. (so did the cops! im sure they thank you for offering them a
$106 bonus for free.) Street racing is also eligal. He could of gotten you
for that also. Especially if your crying, "But he, but he, but he, but
he!"
>> The moral of the story: look before you leap I guess.
Wrong! It’s, "keep your nads in your pants and let jerks go find their own
trouble". If hes willing to cut you off going slow, think what hes willing
to do at speed. I leave these bungholes alone and just hope the cop ahead
will see him for what he is..
Shawn
Scirocco GTi
SCCA DSP #30
The only place you should be racing!
In a previous article, ShawnMeze1 (shawnme…@aol.com) said:
> Shawn
> Scirocco GTi
> SCCA DSP #30
> The only place you should be racing!
SCCA Northern NJ Regional Contact: Walter Huber (201) 838-8884. If you’re
going to play, play Solo-II! The yearly membership and all of the entry
fees for the year probably won’t total the $106 in taxes you just paid.
While you’re at it, scrape up the entry fee and come out to the Waterfest
autocross, where you’ll have a chance of taking home a real trophy instead
of a yellow slip…..
-Arthur