Rev counter temperamental?
Rev counter temperamental?
Hey guys, seems like a silly question this but how does the rev counter work? I guess it's electrical as theres no cable like the speedo. If it is electrical, where does the signal come from to tell it how far to move?
Reason I ask is the counter has been really really dodgy lately, just working when it wants to. I'm thinking possible loose connector but which connector should I be looking at?
Cheers and for your trouble, pics:
Reason I ask is the counter has been really really dodgy lately, just working when it wants to. I'm thinking possible loose connector but which connector should I be looking at?
Cheers and for your trouble, pics:
Re: Rev counter temperamental?
They are usually electrical and trigger from the coil low tension side, basically integrating the pulses to give a frequency to voltage conversion.
The usual reason for erratic behaviour is a poor connection, in my case I had a problem with the battery earth strap (360) as it wasn't bolted to the body properly. With a BMW it was the +ve alternator connection loose, both cause erratic rev counters.
The usual reason for erratic behaviour is a poor connection, in my case I had a problem with the battery earth strap (360) as it wasn't bolted to the body properly. With a BMW it was the +ve alternator connection loose, both cause erratic rev counters.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7
Re: Rev counter temperamental?
Yup, the rev counter triggers from the ignition coil low side/Renix unit. It could well be a dodgy dash connection, the connectors under the dash are notorious for going a bit iffy, and need a good dose of contact cleaner once in a while.
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Re: Rev counter temperamental?
*Im deleting this post as it was written by an idiot that confused a rev counter with a speedo.*
Last edited by volvosneverdie on 08 Jan 2011 05:39 pm, edited 1 time in total.
Re: Rev counter temperamental?
I've been in the dodgy dashboard club for months now, it idles at 250rpm and at full chat it goes all the way up to the heady heights of 1500rpm
I've tried all my connectors dash end and it made no difference so i just accept it doesn't work anymore
I've tried all my connectors dash end and it made no difference so i just accept it doesn't work anymore
89 3dr 340DL in Battleship grey with Ultralights and Williams power
Whats the matter with the car i'm driving can't you tell that it's out of style?
Whats the matter with the car i'm driving can't you tell that it's out of style?
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Re: Rev counter temperamental?
Dear Magnumpies rev counter.magnumpi wrote:I've been in the dodgy dashboard club for months now, it idles at 250rpm and at full chat it goes all the way up to the heady heights of 1500rpm
I've tried all my connectors dash end and it made no difference so i just accept it doesn't work anymore
Youre not doing it right.
Please count more revs.
Re: Rev counter temperamental?
a pulse is sent up to the dash by the renix and i believe it is the grey wire have a little check down that end aswell
C25 ECV-1985-Mk2 340GL-Kessy
A889 VUY-1983-Mk2 360GLS-RUF
A889 VUY-1983-Mk2 360GLS-RUF
volvosneverdie wrote:Vnd says:
diffs, are like pubs and legs.
Best appreciated when open.
I probably should have specified ladies legs in there too. [+=] "embarrarrased emoticon"[].com
Re: Rev counter temperamental?
As we already know you have dodgy fusebox connectors dude, I'll put money on you having a bad earth on the dash cluster. I also put a teeny bet on your flexi pcb having a burnt out track on it when you look into it, in the course of bad earths I've seen the car try and earth everything through the rev counter before, loads of scrappy dashes I've had have had a burnt track.
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
Re: Rev counter temperamental?
I've deffinatly got bad earths. The radio for one gets red hot sometimes as well as the ignition barrel Nothing like a red hot car key for your pocket.
Re: Rev counter temperamental?
FFS. Right, this is your problem
Is this going to be a case of bringing it here and us both swearing at it for a day?
Is this going to be a case of bringing it here and us both swearing at it for a day?
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
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Re: Rev counter temperamental?
Ahem,Chris_C wrote: Is this going to be a case of bringing it here and us both swearing at it for a day?
......................... then yous can fix the car.
Re: Rev counter temperamental?
Possible. I have had this problem since forever thoughChris_C wrote:FFS. Right, this is your problem
Is this going to be a case of bringing it here and us both swearing at it for a day?