Lotus Elan

Lazy Tach

PostPost by: prezoom » Sat Nov 21, 2009 3:03 am

Has anyone ever experienced a "lazy tach"? Switched on the headlights and the tack immediately droped to about half revs. Turning off the lights and the tach went back to normal operation.

Rob Walker
26-4889
Rob Walker
26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Owning a Lotus will get you off the couch
prezoom
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1248
Joined: 16 Mar 2009
Location: Escondido, California

PostPost by: stonks » Sun Nov 22, 2009 9:11 pm

Chap, could it be a poor earth on the instrument?, switching on the lights will add additional load to the earth as the light bulb in the instrument illuminates hence the drop in shown rpm's - only a thought, but worth a try none the less.

Glen
stonks
First Gear
First Gear
 
Posts: 20
Joined: 26 Mar 2007

PostPost by: prezoom » Mon Nov 23, 2009 5:56 pm

Thanks Glen,

Took a 140 mile run yesterday and the tach worked just fine. But got back before dark and forgot to test with the light on. Still fussing with the little bits, the list is getting shorter, and will double check all the grounds today.

Rob Walker
26-4889
Rob Walker
26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe

Owning a Lotus will get you off the couch
prezoom
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1248
Joined: 16 Mar 2009
Location: Escondido, California

Total Online:

Users browsing this forum: No registered users and 15 guests