wanted: Advice/parts list for MFA in B4 TDI

Lug_Nut

TDIClub Enthusiast, Pre-Forum Veteran Member
Joined
Jun 20, 1998
Location
Sterling, Massachusetts. USA
TDI
idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
The subject line says it all. I'd like to put an MFA in my 96 Passat. I'm soliciting advice (in forum or off line) from those that have already done the conversion on a B4 TDI. A cluster and control stalk scavenged from a B4 GLX gasser will get me the obvious items. What other things should I add to my junkyard shopping list? Additional wire harnesses and connectors? Sensors? Any by-pass jumpers? Calibration adjustments or re-coding requirements? The tachometer discrepancy and fuel requirement label are not a concern for now. Any assistance will be appreciated.
 

dzcad90

Rolex & gin
Joined
Mar 15, 1999
Location
Joliet, IL USA
TDI
Jetta - 97 (RIP), '03 (Sold), '09
Has anyone ever done this conversion in an A3 Jetta?

The MFA cluster is available for the TDI in the UK. I would love to do this at some point down the road.

BTW: Here's a part number for a Passatt Instrument Cluster PCB with MFA for the 1Z engine code: 3A0 919 042 A
 

Lug_Nut

TDIClub Enthusiast, Pre-Forum Veteran Member
Joined
Jun 20, 1998
Location
Sterling, Massachusetts. USA
TDI
idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
Kudos to Derek, for refreshing my memory. What can I bring you for Sunday's GTG?
 

tdipoet

Top Post Dawg
Joined
Feb 4, 2002
Location
hooksett, nh
TDI
'11 Jetta TDI
just yourself and the frankencar. every time i see your car i learn something new, and i've been itching to see your fuel tank switching setup. your oil bypass also interests me, as i have not yet installed mine.

phil might want some food or snacks or summat though.
 

RIP TDI

Top Post Dawg
Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT...... '01 Golf GLS 5MT.... '96 Passat Variant....
dzcad90, I got about halfway through installing an MFA in an A3 Jetta before I sold the car. But I got far enough with it to know that it is basically the same process as with the B4 with a couple of exceptions: some of the MFA wiring is missing from the 28-pin cluster harness and there are some differences in internal MIL circuitry between early and late A3 GLX clusters (you should use the later style). And Christi is right, a UK cluster is not an option for a US A3/B4.

Jonathan, I'm sorry to say that I'm only part way through a complete revision of the conversion article. Among other things, it includes an alternate (more elegant but more costly) method of dealing with the tach.

It sounds like you're interested in getting the MFA operational now and worrying about the tach later, so, assuming that's the case, I can supplement the article with updates pertinent to that goal.

1) If you aren't able to find a used wiring harness for the stalk controller, p/ns for the 2 connectors used to make your own harness are:
357-907-968
1HO-953-635
These come w/o pins (I don't have the pin p/n, sorry).

2) If you simply install the unmodified GLX cluster and controller on a plug-and-play basis, you'll have all MFA functions except oil and air temp. Note, though, that you won't have a functioning MIL (nor, of course, an accurate tach). The GLX's MIL will actually be functioning as the glow plug warning light.

3) I do recommend a rebuilt cluster from the dealer vs. a used one from a wrecking yard for a couple of reasons: It may actually be cheaper, when you figure in the additional cost of reprogramming odometer mileage for the used cluster. And you eliminate the risk of winding up with a cluster thats been previously weakened or damaged by low voltage. If you go with a rebuilt unit, you may have a struggle getting it ordered with your current odometer mileage pre-programmed, as dealer parts departments are generally not aware that this is available, but it is (and at no additional cost).

4) Odometer (and MFA distance) accuracy should be fairly close to what it was with your original cluster, but I would check it. GLX overall gearing is a little shorter, but tire OD is a little larger, so it seems to be a wash. If the inaccuracy is excessive, there is a solution, but there is some cost involved ($80). Speedometer accuracy is actually a separate issue and can be corrected at a later date (at no cost) when you break open the cluster to deal with the MIL.

5) I assume that MPG reading accuracy will be important for you now, and, unfortunately, it will probably not be very accurate as installed and will be somewhat time consumming to correct. Its not difficult but involves changing the pump's Injection Quantity value, then waiting till the next fillup to gauge the results and repeating this process several times. I can give you the value that worked for me, but it may not translate to your particular pump/ECM/MFA combination.

Well, this should get you started. Let me know if I can be of help.
 

dzcad90

Rolex & gin
Joined
Mar 15, 1999
Location
Joliet, IL USA
TDI
Jetta - 97 (RIP), '03 (Sold), '09
Bummer. I found part numbers for 1Z Clusters with MFA in both silver and black gauge faces. I was excited until you told me that.

How are the A4 guys doing this? Is it the fact that you can code the cluster with VAG-COM for the United States?

[ January 30, 2003, 10:20: Message edited by: dzcad90 ]
 

RIP TDI

Top Post Dawg
Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT...... '01 Golf GLS 5MT.... '96 Passat Variant....
Whoops...let me retract the recommendation of a dealer rebuilt over a used cluster. Or, let me qualify it...If cost is no object, its the best way to go. I forgot that, because you would not be exchanging "like for like" clusters, the dealer will apply a core charge of $150.

So, back to a used cluster. If the wrecking yard hasn't recorded the mileage on the cluster, have them power it up and check it. You'll need a lower value than your current mileage to be able to roll it forward (can't roll it back).

[ January 30, 2003, 12:36: Message edited by: Chris Bell ]
 

RIP TDI

Top Post Dawg
Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT...... '01 Golf GLS 5MT.... '96 Passat Variant....
Originally posted by dzcad90:
Bummer. I found part numbers for 1Z Clusters with MFA in both silver and black gauge faces. I was excited until you told me that.

How are the A4 guys doing this? Is it the fact that you can code the cluster with VAG-COM for the United States?
<font size="2" face="Verdana, Helvetica, sans-serif">Exactly.
 

Lug_Nut

TDIClub Enthusiast, Pre-Forum Veteran Member
Joined
Jun 20, 1998
Location
Sterling, Massachusetts. USA
TDI
idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
I have 245k miles on my present cluster, finding a used one with fewer miles is not a major issue.
 

Dubbs

Veteran Member
Joined
Dec 10, 1999
Location
RF WI
TDI
Passat,96,Blue
Chris,
You are really peaking my interest on the new/revised MFA cluster procedure.(Thats a great teaser in your post) If it is anything like the first one I know it would be great.
I noted in another post that I already have a GLX cluster. I think I will hold off until late spring until it warms up abit.
It would be nice for those who wants to do this mod to have a GTG so we can help each other out.
 

RIP TDI

Top Post Dawg
Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT...... '01 Golf GLS 5MT.... '96 Passat Variant....
(Edited for erroneous content. See next post)

[ February 02, 2003, 20:29: Message edited by: Chris Bell ]
 

RIP TDI

Top Post Dawg
Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT...... '01 Golf GLS 5MT.... '96 Passat Variant....
Ok, here's some new info. A cluster from a '95 B4 GLS (2.0l gas engine) may be the best choice for this conversion. This one had an MFA either standard or as an option, I'm not sure which. It has the same electronic speedo/odo as the later GLX/TDI, contrary to some info on this forum and the Bentley manual suggesting that they had mechanical ones.

The 2 I've seen were in automatic cars; I assume they were also available in manual cars, but I can't verify that. The advantage of this one is that it is closer to being plug-and-play than the GLX VR6 cluster because the tach will read correctly without modification.

The ETKA does NOT list a GLS 2.0l cluster w/ an MFA for the North American market, so it may only be available used, rather than as a dealer-ordered rebuilt, I don't know. It will still be missing MIL function in the TDI, require reprogramming the odometer value, and the tach will have too high a redline, but it should be a better choice than the GLX cluster.

I don't know how readily available these are in the wrecking yards, or whether or not they all had MFAs, but an MFA-equipped unit can be identified by the size of the MFA/clock display window: its about 2" X 7/8" (vs. 1 1/4" X 1/2" for the clock-only unit).

[ February 03, 2003, 14:31: Message edited by: Chris Bell ]
 
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