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motronic help needed
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what year is the jetta again?
Is it CISe, Motronic or Digifant?
The 88 Jetta that I had, did this idle hunt. and when I started looking =
I found that the idle control switch (throttle position sensor) had a =
cut wire. When I spliced it back together it worked perfectly (it was a =
digifant). Is it possible that this is bad on the Jetta.
Just a thought
----- Original Message -----=20
From: Allyn=20
To: Brian Wagner ; scirocco list=20
Sent: Friday, December 27, 2002 3:55 PM
Subject: Re: motronic help needed
heres a new curveball,
the jetta now idles at like 3000 rpm once warm (i.e. on for 2 =
minutes). cycling the ignition fixes the problem, and it goes back to =
its up and down hunt at ~1200 rpm. could this also be in line with the =
oxygen sensor issue?
thanks
Al
----- Original Message -----=20
From: Brian Wagner=20
To: Allyn ; Brian Wagner ; scirocco list=20
Sent: Tuesday, December 03, 2002 6:39 PM
Subject: Re: motronic help needed
Yep, sounds like it to me but I am 1500plus miles from ya. I had the =
exact symptoms on my 86 roc. Cold idle was great as it warmed up the =
frequency valve was compensating for an inaccruate signal from the o2 =
sensor, disconnect the o2 sensor idle smooth's limp home mode. Plug it =
back in and it starts all over. they can be bad and still supply a =
signal.=20
Brian=20
Allyn <amalventano@sc.rr.com> wrote:=20
ok, looking up the sensor at oxygensensors.com reveals that the =
car is probably
motronic.
i did some on-car checks and revealed the following:
- initial green-wire voltage: 0.0
- started engine, voltage steadily rose to 0.6 over a 30 second =
period.
- also noted that there was no idle fluctuation.
- re-connected wire, fluctuation began.
- connected meter to re-connected wire, revealed fluctuation from =
0.2 to 0.8,
this fluctuation is in-sync with the idle speed fluctuation of =
1000 to 1300 rpm.
this fluctuation occurs at ~5 second cycle.
- disconnected green wire, reading went to a steady 0.7 with the =
idle
fluctuation going away, settling at 1100 rpm.
so does this seem like a bad o2 sensor? its kinda throwing me, =
since its giving
what looks like a decent voltage.
Al
----- Original Message -----
From: Brian Wagner
To: Allyn ; Brian Wa! gner
Sent: Tuesday, December 03, 2002 1:28 PM
Subject: Re: motronic help needed
No voltage, the car will continue to think it is cold and over =
compensate the
mixture. There is a procedure in the bentley to test this (I =
think) if not it is
in the haynes. Does it only do it after it is warm.
Brian
Allyn wrote:
will it give me no voltage, or incorrect voltage?
what would i see if its bad, in other words.
thx
Al
----- Original Message -----
From: Brian Wagner
To: Allyn ; brianm@earendel.org
Cc: scirocco list
Sent: Tuesday, December 03, 2002 1:07 PM
Subject: Re: motronic help needed
Check the 02 sensor if it is bad it can give you that effect.
Allyn wrote:
update:
- from pete (thescirocco), this may actually be digifant 2.
- cleaned out the ISV, did get some gunk out of it, but it wasnt =
enough
to stop
it from working normall! y (verified by problem still existing).
- did some more watching/listening/etc, and realized that its as =
if the
engine
starts to idle rough anywhere below 1050 rpm. i'm sure the engine
management
wants it to idle lower, but keeps bumping it back up to repeatedly
achieve a
smooth idle, only to start over and head back to that hard-coded =
idle
speed.
- i cranked down on the throttle body idle speed screw until i =
went
beyond the
range of control of the isv and dropped the idle to 900. it idles =
a
little
stuttery at that speed, but still holds a decent idle. i would =
leave it
like
this, but that prevents the engine management from controling the =
idle,
which i
would rather not do.
- the cam! ! +exhaust may be causing the stumbly idle, or it may =
be
something else.
i'm open to suggestions.
- final note: this problem existed since i got the car. it has =
remained
constant
as far as how bad it is.
so... should i p! ut a chip in this thing?
thx in advance for help
Al
----- Original Message -----
From:
To: "Allyn"
Cc: "scirocco list"
Sent: Monday, December 02, 2002 11:44 PM
Subject: Re: motronic help needed
>
> Idle stab valve...
> look up the audifans page for cleaning technique... basically =
clean
the
> shot outta it w/ carb cleaner..
>
> On Mon, 2 Dec 2002, Allyn wrote:
>
> > car: 87 jetta wolfsburg 2 dr, 280 k miles
> > mods: unknown cam, tt exhaust
> > problem: idle fluctuates from 1000 to 1300 rpm at 5 second =
period.
smooth
> > fluctuation, with no sudden changes i! n ! rpm.
> > it seems as though if it went below 1000 it would start =
stumbling,
and the
> > engine mgmt brings it back up to prevent a stall. it never =
gets a
chance to
go
> > that low, as it goes back up to 1300.
> >
> > suggestions?
> >!=20
> > thx in advance
> > Al
> >
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> >
>
>
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l
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<DIV><FONT face=3DArial size=3D2>what year is the jetta =
again?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Is it CISe, Motronic or =
Digifant?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The 88 Jetta that I had, did this idle =
hunt. and=20
when I started looking I found that the idle control switch (throttle =
position=20
sensor) had a cut wire. When I spliced it back together it worked =
perfectly (it=20
was a digifant). Is it possible that this is bad on the =
Jetta.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Just a thought</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dmalventano@hotmail.com =
href=3D"mailto:malventano@hotmail.com";>Allyn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dbrian_wagner@sbcglobal.net=20
href=3D"mailto:brian_wagner@sbcglobal.net";>Brian Wagner</A> ; <A=20
title=3Dscirocco-l@scirocco.org =
href=3D"mailto:scirocco-l@scirocco.org";>scirocco=20
list</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, December 27, 2002 =
3:55=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: motronic help =
needed</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>heres a new curveball,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> the jetta now =
idles at like=20
3000 rpm once warm (i.e. on for 2 minutes). cycling the ignition fixes =
the=20
problem, and it goes back to its up and down hunt at ~1200 rpm. could =
this=20
also be in line with the oxygen sensor issue?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>thanks</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Al</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dbrian_wagner@sbcglobal.net=20
href=3D"mailto:brian_wagner@sbcglobal.net";>Brian Wagner</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Damalventano@sc.rr.com=20
href=3D"mailto:amalventano@sc.rr.com";>Allyn</A> ; <A=20
title=3Dbrian_wagner@sbcglobal.net=20
href=3D"mailto:brian_wagner@sbcglobal.net";>Brian Wagner</A> ; <A=20
title=3Dscirocco-l@scirocco.org =
href=3D"mailto:scirocco-l@scirocco.org";>scirocco=20
list</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, December 03, =
2002 6:39=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: motronic help =
needed</DIV>
<DIV><BR></DIV>
<P>Yep, sounds like it to me but I am 1500plus miles from ya. I had =
the=20
exact symptoms on my 86 roc. Cold idle was great as it warmed up the =
frequency valve was compensating for an inaccruate signal from the =
o2=20
sensor, disconnect the o2 sensor idle smooth's limp home mode. Plug =
it back=20
in and it starts all over. they can be bad and still supply a =
signal.=20
<P>Brian=20
<P>
<P> <B><I>Allyn <<A=20
=
href=3D"mailto:amalventano@sc.rr.com";>amalventano@sc.rr.com</A>></I></=
B>=20
wrote:=20
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff =
2px solid">ok,=20
looking up the sensor at oxygensensors.com reveals that the car is =
probably<BR>motronic.<BR>i did some on-car checks and revealed the =
following:<BR>- initial green-wire voltage: 0.0<BR>- started =
engine,=20
voltage steadily rose to 0.6 over a 30 second period.<BR>- also =
noted that=20
there was no idle fluctuation.<BR>- re-connected wire, fluctuation =
began.<BR>- connected meter to re-connected wire, revealed =
fluctuation=20
from 0.2 to 0.8,<BR>this fluctuation is in-sync with the idle =
speed=20
fluctuation of 1000 to 1300 rpm.<BR>this fluctuation occurs at ~5 =
second=20
cycle.<BR>- disconnected green wire, reading went to a steady 0.7 =
with the=20
idle<BR>fluctuation going away, settling at 1100 rpm.<BR>so does =
this seem=20
like a bad o2 sensor? its kinda throwing me, since its =
giving<BR>what=20
looks like a decent voltage.<BR>Al<BR><BR><BR>----- Original =
Message=20
-----<BR>From: Brian Wagner<BR>To: Allyn ; Brian Wa! gner<BR>Sent: =
Tuesday, December 03, 2002 1:28 PM<BR>Subject: Re: motronic help=20
needed<BR><BR><BR>No voltage, the car will continue to think it is =
cold=20
and over compensate the<BR>mixture. There is a procedure in the =
bentley to=20
test this (I think) if not it is<BR>in the haynes. Does it only do =
it=20
after it is warm.<BR><BR>Brian<BR><BR>Allyn=20
<AMALVENTANO@SC.RR.COM>wrote:<BR><BR>will it give me no voltage, =
or=20
incorrect voltage?<BR>what would i see if its bad, in other=20
words.<BR>thx<BR>Al<BR><BR>----- Original Message -----<BR>From: =
Brian=20
Wagner<BR>To: Allyn ; brianm@earendel.org<BR>Cc: scirocco =
list<BR>Sent:=20
Tuesday, December 03, 2002 1:07 PM<BR>Subject: Re: motronic help=20
needed<BR><BR><BR>Check the 02 sensor if it is bad it can give you =
that=20
effect.<BR><BR>Allyn =
<AMALVENTANO@SC.RR.COM>wrote:<BR><BR>update:<BR>-=20
from pete (thescirocco), this may actually be digifant 2.<BR>- =
cleaned out=20
the ISV, did get some gunk out of it, but it wasnt enough<BR>to =
stop<BR>it=20
from working normall! y (verified by problem still existing).<BR>- =
did=20
some more watching/listening/etc, and realized that its as if=20
the<BR>engine<BR>starts to idle rough anywhere below 1050 rpm. i'm =
sure=20
the engine<BR>management<BR>wants it to idle lower, but keeps =
bumping it=20
back up to repeatedly<BR>achieve a<BR>smooth idle, only to start =
over and=20
head back to that hard-coded idle<BR>speed.<BR>- i cranked down on =
the=20
throttle body idle speed screw until i went<BR>beyond the<BR>range =
of=20
control of the isv and dropped the idle to 900. it idles=20
a<BR>little<BR>stuttery at that speed, but still holds a decent =
idle. i=20
would leave it<BR>like<BR>this, but that prevents the engine =
management=20
from controling the idle,<BR>which i<BR>would rather not do.<BR>- =
the cam!=20
! +exhaust may be causing the stumbly idle, or it may =
be<BR>something=20
else.<BR>i'm open to suggestions.<BR>- final note: this problem =
existed=20
since i got the car. it has remained<BR>constant<BR>as far as how =
bad it=20
is.<BR><BR>so... should i p! ut a chip in this thing?<BR>thx in =
advance=20
for help<BR>Al<BR><BR><BR>----- Original Message =
-----<BR>From:<BR>To:=20
"Allyn"<BR>Cc: "scirocco list"<BR>Sent: Monday, December 02, 2002 =
11:44=20
PM<BR>Subject: Re: motronic help needed<BR><BR><BR>><BR>> =
Idle stab=20
valve...<BR>> look up the audifans page for cleaning =
technique...=20
basically clean<BR>the<BR>> shot outta it w/ carb=20
cleaner..<BR>><BR>> On Mon, 2 Dec 2002, Allyn =
wrote:<BR>><BR>>=20
> car: 87 jetta wolfsburg 2 dr, 280 k miles<BR>> > mods: =
unknown=20
cam, tt exhaust<BR>> > problem: idle fluctuates from 1000 to =
1300=20
rpm at 5 second period.<BR>smooth<BR>> > fluctuation, with =
no sudden=20
changes i! n ! rpm.<BR>> > it seems as though if it went =
below 1000=20
it would start stumbling,<BR>and the<BR>> > engine mgmt =
brings it=20
back up to prevent a stall. it never gets a<BR>chance =
to<BR>go<BR>>=20
> that low, as it goes back up to 1300.<BR>> ><BR>> =
>=20
suggestions?<BR>> >! <BR>> > thx in advance<BR>> =
>=20
Al<BR>> ><BR>> ><BR>> >=20
_______________________________________________<BR>> > =
Scirocco-l=20
mailing list<BR>> > Scirocco-l@scirocco.org<BR>> >=20
http://neubayern.net/mailman/listinfo/scirocco-l<BR>>=20
=
><BR>><BR>><BR><BR><BR>_________________________________________=
______<BR>Scirocco-l=20
mailing=20
=
list<BR>Scirocco-l@scirocco.org<BR>http://neubayern.net/mailman/listinfo/=
scirocco-<BR><BR><BR>_______________________________________________<BR>S=
cirocco-l=20
mailing=20
=
list<BR>Scirocco-l@scirocco.org<BR>http://neubayern.net/mailman/listinfo/=
scirocco-l</BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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