90 No Tach issue

[talon1990TSi]

First off this is a 1990 talon tsi


Ever since I first got my car the stock tach has never worked. I've been going off my SAFC-II and I just want to get the stock one working again.
I've searched this before with no luck and now I'm back at it trying to figure this out again.

its a 90 yeah I know all about it being different then the 91's
Everything is 90 stuff just so that's clear.

My tach never moves at all never

Things that work
tach reads on SAFC-II and Logger

Tried/ swapped out :

Another cluster
Ecu

http://www.dsmtuners.com/forums/articles-electrical-wiring/414636-how-fix-1990-dsm-tach.html


All in all the car runs and drivers great just this little problem.

 

[fonzi90Tsi]

I have the same problem. Everything is 90s on mine as well.

 

[rebuild4g63]

I have had that problem as well bought a different car haha, could be the sensor on your tranny.

 

[1990AWD]

Check to see if you have a noise filter, if you don't, find one or jimmy rig it. I don't recommend the "fix" recommended, just using the link so you can get some info and a pic of the noise filter.

I'M FOUND IN THE TECH ARTICLES FOR A REASON!!!

I have had that problem as well bought a different car haha, could be the sensor on your tranny.

Engine RPM has nothing to do with the transmission.

Do people even search these days...

 

[Sebba]

My '90 tach wanders a little, the needle twitches . Would the 'fix' stop it?

 

[1990AWD]

My '90 tach wanders a little, the needle twitches . Would the 'fix' stop it?

Do you have a noise filter? Is it grounded properly?

On my old '90 TSi the tach didn't work because I had no noise filter yet sometimes it would bounce around randomly and if I washed it, it would work until the engine bay dried off.

 

[Sebba]

I haven't taken it apart to find out. I've only driven it for a few minutes, pretty sad but that's what happens when you've got to leave a broken DSM at a shop.

 

[1990AWD]

I haven't taken it apart to find out. I've only driven it for a few minutes, pretty sad but that's what happens when you've got to leave a broken DSM at a shop.

Well I would check that first and then maybe look at the CAS, but definitely get that noise filter checked.

 

[talon1990TSi]

Check to see if you have a noise filter, if you don't, find one or jimmy rig it. I don't recommend the "fix" recommended, just using the link so you can get some info and a pic of the noise filter.

I'M FOUND IN THE TECH ARTICLES FOR A REASON!!!



Engine RPM has nothing to do with the transmission.

Do people even search these days...

If you read my first post you would of seen that I had already tired that.

Dont people read anymore

 

[1990AWD]

Well... do you or do you not have a good noise filter that is plugged in and grounded to the intake manifold?

 

[talon1990TSi]

I do and I even tested it with a meter. its good

 

[jb2zero0six5]

Well, then you tested the continuity in the wires? Coil pack and Power transistor/ignitor are next. I have spares that work.

 

[talon1990TSi]

I cant seem to figures this 90 wiring out no wonder they changed everything in 91. I'm just going to get this and make life easy. MSD Ignition 8918 - MSD Tach Signal GMR Pickups - Overview - SummitRacing.com

 

[1990AWD]

Try changing out the coil with another '90 model. The tach gets its signal off the tacho interface thing on the coil IIRC.

 

[talon1990TSi]

Ok thanks guess I could swap one in first. Since I got a 90 fwd that the tach works in.