the tacho in my SS torry is playing up. When I turn the ignition on, but dont start the car, the tacho sometime starts moving. I dont know how this can happen as the car has not been started. And while driving, the tacho increases from 2000 rpm at 100km/hr up to 3000rpm at random times. I have a 2.78 diff and i believe the car should be reving at approx 2000rpm.
Has anyone else had this problem before? and can let me know what is happening. Or is my tacho just about to shit itself? if this is the case...would anyone have a tacho they wish to sell to me?
regs
Matt
SS Tacho
Started by
Orange SS
, Feb 15 2006 10:45 AM
5 replies to this topic
#1
Orange SS
-
- Members
-
- 523 posts
Forum Fixture
- Name:Matt
- Location:Gold Coast
- Car:1976 LX SS Hatch
- Joined: 27-January 06
Posted 15 February 2006 - 10:45 AM
#2
_Yella SLuR_
_Yella SLuR_
-
- Guests
Posted 15 February 2006 - 11:39 AM
Tacho works on current in the coil, when you put your ignition on, there is power going to the coil, a single pulse anyways.
Have a look at the earth wire up along side the actual connection for the tacho wire (have a look up under the dash near the Park Brake release rod). Also check out where it is connected to and give that a clean as well. There is also the tacho wire connection itself which may be loose/dirty.
Sounds like dirty connections somewhere to me.
Have a look at the earth wire up along side the actual connection for the tacho wire (have a look up under the dash near the Park Brake release rod). Also check out where it is connected to and give that a clean as well. There is also the tacho wire connection itself which may be loose/dirty.
Sounds like dirty connections somewhere to me.
Edited by Yella SLuR, 15 February 2006 - 11:39 AM.
#3
antelopeslr5000
-
- Members
-
- 1,022 posts
Forum Fixture
- Location:Toowoomba, Queensland
- Car:1977 LX SL/R 5000
- Joined: 10-November 05
Posted 15 February 2006 - 08:01 PM
Well, the tacho doesn't actually work from current in the coil.
The tacho is basically a frequency counter, counting how many times the points in the distributor open and close (signal pulses). It could be, as Yella SLuR suggest, a faulty connection.
I'm assuming that your car is running fine (no misfires etc...) so it maybe that your tacho is on the way out. Usually timing capacitors, when subject to failure, can cause erratic behaviour as you have explained. Not having a Torana tacho here with me, I don't even know if they use a timing capacitor. (someone might be able to jump in here and help me out!). If they do, it may be a simple task of removing the faulty capacitor and replacing with a new one, of the same uF of course.
I'd also check the selector switch located on the back of the tacho. You say that it goes from 2000rpm to 3000rpm. If my maths is correct here...
2000 divided by 6 the multiply by 8 = 3000.
Could be as something as simple as the tacho switch maybe worn and is moving between or set between the 6 and 8 cylinder positions. Just a stab in the dark!
Hope this helps!
The tacho is basically a frequency counter, counting how many times the points in the distributor open and close (signal pulses). It could be, as Yella SLuR suggest, a faulty connection.
I'm assuming that your car is running fine (no misfires etc...) so it maybe that your tacho is on the way out. Usually timing capacitors, when subject to failure, can cause erratic behaviour as you have explained. Not having a Torana tacho here with me, I don't even know if they use a timing capacitor. (someone might be able to jump in here and help me out!). If they do, it may be a simple task of removing the faulty capacitor and replacing with a new one, of the same uF of course.
I'd also check the selector switch located on the back of the tacho. You say that it goes from 2000rpm to 3000rpm. If my maths is correct here...
2000 divided by 6 the multiply by 8 = 3000.
Could be as something as simple as the tacho switch maybe worn and is moving between or set between the 6 and 8 cylinder positions. Just a stab in the dark!
Hope this helps!
Edited by antelopeslr5000, 15 February 2006 - 08:03 PM.
#4
_devilsadvocate_
_devilsadvocate_
-
- Guests
Posted 15 February 2006 - 09:31 PM
Like your post antelopeslr5000, no rubbish.................., except best check your arithmetic skills. Is that location correct? Have you got wheels where you are?If my maths is correct here...
2000 divided by 6 the multiply by 8 = 3000.
#5
antelopeslr5000
-
- Members
-
- 1,022 posts
Forum Fixture
- Location:Toowoomba, Queensland
- Car:1977 LX SL/R 5000
- Joined: 10-November 05
Posted 16 February 2006 - 01:18 AM
Oops! Bad maths there! Doesn't even get close to 3000!
I actually did the maths using a 4 and 6 cylinder.
i.e 2000 divided by 4 then multiplied by 6 = 3000
...but was thinking of an 8 cylinder because it's a SS. I feel so stupid!
My location is correct (unlike my maths!) UK, Hammersmith.
Unfortunately I don't have my car with me. It would definitely be an eye catcher around the streets of London.
I actually did the maths using a 4 and 6 cylinder.
i.e 2000 divided by 4 then multiplied by 6 = 3000
...but was thinking of an 8 cylinder because it's a SS. I feel so stupid!
My location is correct (unlike my maths!) UK, Hammersmith.
Unfortunately I don't have my car with me. It would definitely be an eye catcher around the streets of London.
#6
_EXLXSL_
_EXLXSL_
-
- Guests
Posted 16 February 2006 - 08:19 PM
Mmm. Nice wheel centre caps you got there. Must see if I can get a new set for mine. V5s, gold but a bit wider on the rear.
2 user(s) are reading this topic
0 members, 2 guests, 0 anonymous users
