tachometer/RPM not working?

[m3f_avusbluM3_501bf34800]

Since Ive had my 1995 m3 (2months) the RPM guage doesnt work 100% all the time. Sometimes it doesnt work at all..and then while shifting to second its going to work and then at times when dropping it to 4th it stops working again.



what could be causing this?

[m3f_BMWchubbs_4190f21071]

Since Ive had my 1995 m3 (2months) the RPM guage doesnt work 100% all the time. Sometimes it doesnt work at all..and then while shifting to second its going to work and then at times when dropping it to 4th it stops working again.


what could be causing this?


I have same thing...My guages like to freak out and either lag (Show 10MPH Less than I am actually going, and that ratio of range on all 4 needles) you just gotta smack the top of the dash a few times.

[m3f_avusbluM3_501bf34800]

I have same thing...My guages like to freak out and either lag (Show 10MPH Less than I am actually going, and that ratio of range on all 4 needles) you just gotta smack the top of the dash a few times.



ah ok.. but mine its only the RPM..just dies when it wants and then starts working. It works everyday but just when it wants..and stops while changing gears.

[m3f_BMWchubbs_4190f21071]

ah ok.. but mine its only the RPM..just dies when it wants and then starts working. It works everyday but just when it wants..and stops while changing gears.


Oh...Yours is probably just a bad sender connection if it does it while changing gears.

[m3f_avusbluM3_501bf34800]

Oh...Yours is probably just a bad sender connection if it does it while changing gears.



ohright..and what would be the way to fix it?sorry not too fimiliar with these stuff

thanks

[m3f_badgtho_2cb87af10e]

i actually would think it's an issue in the cluster.


there is no "sender" proper for the tach

[m3f_avusbluM3_501bf34800]

i actually would think it's an issue in the cluster.



there is no "sender" proper for the tach



thats what I was afraid of lol



lets say if I do get another cluster..would the actual mileage show back on that 1 or Ill need to get something close to my mileage?

[m3f_badgtho_2cb87af10e]

thats what I was afraid of lol



lets say if I do get another cluster..would the actual mileage show back on that 1 or Ill need to get something close to my mileage?



honeslty... no idea on the 95s/



on the newer cars the DME knows the mileage.



E30s do this all the time.. mine did.



you can just replace/repair the tach circuit.

[m3f_s50swapped]

Take the cluster apart, note the coil of metal on the back of the needle. Just rip it all off.


Gauge will work fine. Not sure what purpose it served but that method worked just fine on my non-m cluster before I upgraded to aftermarket.

[m3f_Shock(/\)a_09ddd0b861]

i actually would think it's an issue in the cluster.



there is no "sender" proper for the tach



Agreed. If you were having issues with the speedometer (and odometer) that could be the sensor on the differential, but that's not the case here.



lets say if I do get another cluster..would the actual mileage show back on that 1 or Ill need to get something close to my mileage?



All you would need to do is pull the mileage plug out from the back of your current cluster and pop it in the replacment. :thumbsup:

[m3f_avusbluM3_501bf34800]

Agreed. If you were having issues with the speedometer (and odometer) that could be the sensor on the differential, but that's not the case here.







All you would need to do is pull the mileage plug out from the back of your current cluster and pop it in the replacment. :thumbsup:



thanks! so the mileage would be the same even if the other 1 has more than my current 1?

[m3f_Anubis_1a58e4eec0]

honeslty... no idea on the 95s/


on the newer cars the DME knows the mileage.


E30s do this all the time.. mine did.


you can just replace/repair the tach circuit.


It's actually just stored in a coding plug in the back of the instrument cluster. Starting with the E34, the mileage data is stored both in a coding plug and the LKM (light control module). The E36 didn't get a coding plug until ~1995, and the E36 has no LKM. Later BMWs have mileage stored in the DME, LKM, and coding plug. In an E36, the mileage data is stored in the coding plug and the cluster EEPROM (or just cluster EEPROM if you have no coding plug).


Some early E36s don't have coding plugs. I'm not sure if the '95 M3 has one. If your cluster has a coding plug, you can simply remove it, install it into a new cluster with 0 miles (or any mileage LOWER than your old cluster) and run a cluster test (#9) to reset the mileage to the higher value (in this case, the coding plug). This will cancel the odometer tamper dot that will turn on when you replace the coding plug. If the new cluster you buy has HIGHER mileage than your old one, it will NOT synchronize properly, and you'll end up with the higher mileage. Cluster tests: http://www.bmw-m.net/techproc/test.htm


As badgtho suggested - repairing the tach circuit is a simpler choice than messing with the mileage/coding plugs.

[m3f_avusbluM3_501bf34800]

It's actually just stored in a coding plug in the back of the instrument cluster. Starting with the E34, the mileage data is stored both in a coding plug and the LKM (light control module). The E36 didn't get a coding plug until ~1995, and the E36 has no LKM. Later BMWs have mileage stored in the DME, LKM, and coding plug. In an E36, the mileage data is stored in the coding plug and the cluster EEPROM (or just cluster EEPROM if you have no coding plug).



Some early E36s don't have coding plugs. I'm not sure if the '95 M3 has one. If your cluster has a coding plug, you can simply remove it, install it into a new cluster with 0 miles (or any mileage LOWER than your old cluster) and run a cluster test (#9) to reset the mileage to the higher value (in this case, the coding plug). This will cancel the odometer tamper dot that will turn on when you replace the coding plug. If the new cluster you buy has HIGHER mileage than your old one, it will NOT synchronize properly, and you'll end up with the higher mileage. Cluster tests: http://www.bmw-m.net/techproc/test.htm



As badgtho suggested - repairing the tach circuit is a simpler choice than messing with the mileage/coding plugs.







thanks alot for ur post..made me understand very clearly..thanks again.



I guess Ill try repairing the tach circuit and then see what happens!

[m3f_Shock(/\)a_09ddd0b861]

It's actually just stored in a coding plug in the back of the instrument cluster. Starting with the E34, the mileage data is stored both in a coding plug and the LKM (light control module). The E36 didn't get a coding plug until ~1995, and the E36 has no LKM. Later BMWs have mileage stored in the DME, LKM, and coding plug. In an E36, the mileage data is stored in the coding plug and the cluster EEPROM (or just cluster EEPROM if you have no coding plug).



Some early E36s don't have coding plugs. I'm not sure if the '95 M3 has one. If your cluster has a coding plug, you can simply remove it, install it into a new cluster with 0 miles (or any mileage LOWER than your old cluster) and run a cluster test (#9) to reset the mileage to the higher value (in this case, the coding plug). This will cancel the odometer tamper dot that will turn on when you replace the coding plug. If the new cluster you buy has HIGHER mileage than your old one, it will NOT synchronize properly, and you'll end up with the higher mileage. Cluster tests: http://www.bmw-m.net/techproc/test.htm



As badgtho suggested - repairing the tach circuit is a simpler choice than messing with the mileage/coding plugs.



This tends to be tough information to find online, by the way, as it unlocks the secrets to mileage fraud in these cars. :shifty:

[m3f_badgtho_2cb87af10e]

This tends to be tough information to find online, by the way, as it unlocks the secrets to mileage fraud in these cars. :shifty:



how does the 94 cluster work?



a series of knobs, tubes and rubber bands ?



:shiftdriv