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#1
03-28-2005, 09:35 PM
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300TE tachometer won't go above 1k rpm
reving car up tach, rpm reading won't go above approx. 1000 rpm. I believe the fuel pump relay also handles the tach. Exchanging relays & checking plugs on back of instrument cluster haven't changed things.
Any suggestions? 
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#2
03-28-2005, 11:17 PM
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maybe the gear is stuck?
__________________
2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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#3
03-29-2005, 10:06 AM
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a bad ground can cause this. try pulling the cluster and running an extra ground wire from the back of the metal part of the housing that has the tach to a metal ground point on the car (there are plenty behind the cluster).
__________________
2005 Mercedes C230k sport sedan, 6 speed 1987 Porsche 924S - 968-engined track car
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#5
03-30-2005, 12:47 AM
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 sticking gear!What I mean is that maybe the internals of the tach came out of alignment and the gearing can only move so far before it locks up.... a jumped spring could cause this..... My recommendation: Buy a used cluster (a three gauges in the big shell) from ebay for about $30 Take it's tach and swap it with yours... If it does not work, then I will buy the cluster from you for whatever you paid plus shipping... I am not kidding, I am dead serious!  But I could be wrong, just wait a bit, someelse will chime in with some more tips real soon!
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2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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#6
03-30-2005, 01:31 AM
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This link describes how to check the rpms at the X11 diagnostic connector. While it may not be totally helpful, you might be able to isolate the trouble:
http://www.landiss.com/mixture.htm
__________________
89 300te 222,222 92 300e 190,000
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#7
03-30-2005, 04:28 PM
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Lol, maybe I gave bad advice... my tach started acting up today! LOL I am cursed!
__________________
2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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#8
03-30-2005, 04:35 PM
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Your problem happened to me when I took off my cluster to try and fix the odo....
i think you should try to take out the cluster....and disconnect and reconnect the tach wire.... maybe use a little dielectric grease on it.. I am not much help... I totaled out that car before I had a chance to take my own advice...
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#9
03-30-2005, 05:05 PM
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Sorry to hear that about your car.
__________________
2006 BMW M5 "Heidi" @ 109,000 miles 2005 MBZ C55 AMG "Lorelai" @ 165,000 miles 1991 MBZ 300E "Benzachino II" @ 165,000 miles 1990 MBZ 500SL "Shoshanna" @ 118,000 miles (On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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