After accelerating, tacho oscillates +/- 1000 rpm and steadies down after 2 - 3 seconds to a stable value. No other issues. Is this normal?, I haven't checked anything yet, pending replies.
Garrett
'73 2.4S Targa
After accelerating, tacho oscillates +/- 1000 rpm and steadies down after 2 - 3 seconds to a stable value. No other issues. Is this normal?, I haven't checked anything yet, pending replies.
Garrett
'73 2.4S Targa
Hi Garrett,
That isn't normal. If you know your gear ratios, and you know that your speedomoter is accurate, you might check to see whether it is still accurate and just bouncy, or if it needs a rebuild.
Tacho bounce could also be due to having a non compatible CD Box. For instance, switching out the original Bosch unit for an aftermarket unit like Permatine or MSD could cause the tacho to bounce or not work at all. You might also check the ground.
Things like oil temp, speedo and revs are important, so if it were me I would ship it off to N. Hollywood Speedometer and have it checked and rebuilt. I have had all of my gauges checked and rebuilt - except the clock whivh runs slow by about 3 hours aper day. I don't even pay attention to it as long as it lights up at night and looks good...
Huh. I always thought this was normal. I guess I'll have to add this to my project list.
Kenik
- 1969 911S
- 1965/66 911
- S Reg #760
- RGruppe #389
Garrett,
Also check the purple wire connection (tach) on the side of the distributor... making sure both sides of the spade connector is clean and the connection is tight.
Cheers,
Chuck Miller
Creative Advisor/Message Board Moderator - Early 911S Registry #109
R Gruppe #88
TYP901 #62
'73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
'67 Malibu 327 spt cpe - Period 350 Rebuild
’98 Chevy S-10 – Utility
’15 GTI – Commuter
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John Gray
70 old air
86 middle air
95 new air
Thanks, guys.
I have checked out the connections, that purple striped lead was quite loose at the spade connection: fixed. Its piggybacked onto a black lead, is this right?
I have also cheched points gap, I await getting a DVM for next weekend to check out electrics more thoroughly. Then on to instruments if necessary.
I'll be back