dodgy rev counter
23-11-2005, 10:14 PM
#6
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check the gap on the TDC sensor mate 
and the wireing to it
the phase sensor is to do with the fuel cycle i'm lead to believe.
(the phase sensor is in the dizzy but dont do the spark)
the TDC sensor is the one that manages the spark
I'd say It COULD well be linked with your other post
of problems over 4000 rpm..
I was told Wobbleing rev counter is a 'classic symptom' of
a dodgey TDC sensor.
Hope this helps.
and the wireing to it
the phase sensor is to do with the fuel cycle i'm lead to believe.
(the phase sensor is in the dizzy but dont do the spark)
the TDC sensor is the one that manages the spark
I'd say It COULD well be linked with your other post
of problems over 4000 rpm..
I was told Wobbleing rev counter is a 'classic symptom' of
a dodgey TDC sensor.
Hope this helps.
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24-11-2005, 07:44 AM
#8
PassionFord Post Whore!!
I have fitted all the sensors going to mine and it never cured it ,it got worse at one point then stopped doing it but i know it will be back soon ,its a cosworth ,lol
25-11-2005, 03:47 PM
#10
Originally Posted by Mad_Ad_300bhp
no it wont. ive had this problem aswell but never found a cure. I know its not the ignition amp though 
If the ignition amp wasn't recieving a earth signal properly it would be sending the incorrect signal to the phaze sensor and the ECU Hence making it misfire....I had that problem where the rev counter was going all over the place while on boost
....Making the car miss like a cooont 
I spent about 6 months trying different things...Some expensive replacements were brought aswell when i didn't really need to. Thing was i spent about 300 quid on new parts trying to solve the problem when it was something simple all along that would have cost me a fiver 
These 2 thnigs solved my misfire and rev counter problems....2 things....Take the ignition amp off and clean the metal plate it's attached to on the inner wing. Also earth it straight to the battery (I've just got a piece of wire from an amp wiring kit and threaded it through the screw directly to the battery.) I've also Earthed the engine again straight from the battery to one of the inlet manifold bolts.
Make sure you gave them a small rub down with some wet+dry to make sure you get a good connection. My theory is that the earth signal is not very strong and needs a boost.
Give it a go!
25-11-2005, 04:21 PM
#11
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Smit
good to hear someone has solved it! mine still does it every now and again.
Did you earth the Ignition amp From the backing plate?
as in attach the wire to the backing plate of the amp,
or is it run off one of the wires going to the igniton amp??
thanks mate!
i'll do mine tomorow now!
good to hear someone has solved it! mine still does it every now and again.
Did you earth the Ignition amp From the backing plate?
as in attach the wire to the backing plate of the amp,
or is it run off one of the wires going to the igniton amp??
thanks mate!
i'll do mine tomorow now!
26-11-2005, 05:26 AM
#13
Originally Posted by pee vee
Did you earth the Ignition amp From the backing plate?
I used an earth wire from an amp kit which had a 'O' connector each end. One went straight on the battery the other one went on the screw which holds the Ign Amp to the metal plate
As in attach the wire to the backing plate of the amp,
Nope use new screws and place the screw through the 'O' on the end of the wire and tighten up as usual
or is it run off one of the wires going to the igniton amp??
Nope
26-11-2005, 12:44 PM
#15
PassionFord Post Whore!!
This was gonnae be my next move was to re-earth the engine bay all over !!
I still get missfires and dodgy rev counter occasionally and it does start to get on ur tits ,lol
I know my amp is fine as i bought a brand new one ages ago and made sure plate was in good clean health !!
Thats the next move is to earth the bay bigtime
I still get missfires and dodgy rev counter occasionally and it does start to get on ur tits ,lol
I know my amp is fine as i bought a brand new one ages ago and made sure plate was in good clean health !!
Thats the next move is to earth the bay bigtime
12-12-2005, 03:27 PM
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yes mate earthed the ignition amp and its fine have not had chance to take it for a rip due to my insurance running out bloody girlfriends and christmas!!
bloody girlfriends and christmas!!
28-12-2005, 08:39 AM
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I've taken the car out and to no avail, it is still playing up
I've earthed it off the ignition amplifier with a piece of wire with a ring connector so the screw goes through the ring connector to the backing plate so the wire is sandwiched between the two is this right?
Or do I make a new connection off the backing plate?
I've earthed it off the ignition amplifier with a piece of wire with a ring connector so the screw goes through the ring connector to the backing plate so the wire is sandwiched between the two is this right?
Or do I make a new connection off the backing plate?
29-12-2005, 07:21 PM
#21
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hello all i think ive got the same problem
ive noticed that my rev counter jumps about at around 2500 rpm somtimes notice a missfire at the same engine speed , and also noticed that there is a crackling through the speakers when the radio is turned on that corisponds with the rev counter jumps also it seems to be worse when it not up to running temp!
ive noticed that my rev counter jumps about at around 2500 rpm somtimes notice a missfire at the same engine speed , and also noticed that there is a crackling through the speakers when the radio is turned on that corisponds with the rev counter jumps
also it seems to be worse when it not up to running temp!
29-12-2005, 10:14 PM
#22
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there was a post up in general about this problem the other day
Stu@MSD advised checking/ cutting out and soldering
the 3 plug connections on the bulk head of the car
just literally above the cam cover.
i think mine is doing it a bit still
and i seriously think it is effecting the performance of the car
EVEN when the rev counter is not visably jumping, think there is still
a very slight mis-fire..
so im gonna have a look at mine over the weekend!
Stu@MSD advised checking/ cutting out and soldering
the 3 plug connections on the bulk head of the car
just literally above the cam cover.
i think mine is doing it a bit still
and i seriously think it is effecting the performance of the car
EVEN when the rev counter is not visably jumping, think there is still
a very slight mis-fire..
so im gonna have a look at mine over the weekend!
29-12-2005, 11:10 PM
#24
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i earthed the Ignition amp And the engine
and It has helped a lot!!
Will try the other plugs above the engine tomorrow or some point over the weekend, as i got a niggleing suspsion about them! lol
but yea, the earthing trick Definitly helped thanks!!!
i earthed the Ignition amp And the engine
and It has helped a lot!!
Will try the other plugs above the engine tomorrow or some point over the weekend, as i got a niggleing suspsion about them! lol
but yea, the earthing trick Definitly helped thanks!!!
21-01-2006, 08:44 PM
#27
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right, I've taken the 3 plugs on the bulkhead of the engine bay off,
and actually replaced the multi plugs. cut off any of the kinked and broken wire that was there.
(will get a pic next tomorrow)
Definitly made a difference! the little hesitation that it had and
Occasional Slight mis fire further up rev range (along with rev counter jumping at same time) is gone.
car pulls really strong now,
the plugs BEFORE i changed and tidied up.
and actually replaced the multi plugs. cut off any of the kinked and broken wire that was there.
(will get a pic next tomorrow)
Definitly made a difference! the little hesitation that it had and
Occasional Slight mis fire further up rev range (along with rev counter jumping at same time) is gone.
car pulls really strong now,
the plugs BEFORE i changed and tidied up.
22-01-2006, 09:52 AM
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I've earthed the engine as well but its still missing not quite as bad
I'll have a look at the multiplugs aswell mine look like pee-vee's well maybe a bit worse
the Mrs is going shopping so I'll have time to play
I'll post up the outcome later
I'll have a look at the multiplugs aswell mine look like pee-vee's well maybe a bit worse
the Mrs is going shopping so I'll have time to play
I'll post up the outcome later
08-08-2009, 12:08 PM
#29
Mines just started doing this again.
Ive replaced,
Distributor Cap
Rotor Arm
Phase Sensor
HT Lead
Plug leads
Spark plugs
Coil
New Battery
I have a new ECT sensor but not yet fitted it. I have also just ordered a new ignition amplifier.
I am just wondering if it;s worth changing the map sensor?? would this effect the rev counter jumping though?
Ive replaced,
Distributor Cap
Rotor Arm
Phase Sensor
HT Lead
Plug leads
Spark plugs
Coil
New Battery
I have a new ECT sensor but not yet fitted it. I have also just ordered a new ignition amplifier.
I am just wondering if it;s worth changing the map sensor??
would this effect the rev counter jumping though?
09-08-2009, 08:36 AM
#33
I had similar problems in my car with the rev counter going skyward under boost, The multi plugs on the loom were cut out and it solved the problem for about 16 months but then problem returned, it was the engine loom in my car that had had its day, replaced that and bob's ya aunties live in lover, problem solved,
with any mis-fire its a pain in the harris trying to trace it but start with the cheaper components, leads, plugs, sensors etc, once you exhausted all these bits and problem remains imo it has to be the engine loom.
Luciano
with any mis-fire its a pain in the harris trying to trace it but start with the cheaper components, leads, plugs, sensors etc, once you exhausted all these bits and problem remains imo it has to be the engine loom.
Luciano
09-08-2009, 09:27 AM
#34
20K+ Super Poster.
Just face the fact that most of the stuff replaced isn't remotely capable of affecting the rev counter in this way, and certainly not without affecting the engine also.
The rev counters really are that shit, I have had these regutted before, with all new internals but scaled to correctness, not a missed beat afterwards.
If anything I would try a tacho driver, which is basically a amplifier just for the signal, as these seem stupidly sensistive to signal, I run one myself and suffer no problems since fitting.
tabetha
The rev counters really are that shit, I have had these regutted before, with all new internals but scaled to correctness, not a missed beat afterwards.
If anything I would try a tacho driver, which is basically a amplifier just for the signal, as these seem stupidly sensistive to signal, I run one myself and suffer no problems since fitting.
tabetha
09-08-2009, 11:49 AM
#35
I had similar problems in my car with the rev counter going skyward under boost, The multi plugs on the loom were cut out and it solved the problem for about 16 months but then problem returned, it was the engine loom in my car that had had its day, replaced that and bob's ya aunties live in lover, problem solved,
with any mis-fire its a pain in the harris trying to trace it but start with the cheaper components, leads, plugs, sensors etc, once you exhausted all these bits and problem remains imo it has to be the engine loom.
Luciano
with any mis-fire its a pain in the harris trying to trace it but start with the cheaper components, leads, plugs, sensors etc, once you exhausted all these bits and problem remains imo it has to be the engine loom.
Luciano
Thanks for the reply, couple of quick questions,
How much and where do I get a loom from???
And the most important approx cost for fitting??
I might just take her off the road now as I was going to do the resto on her next year anyway.
09-08-2009, 04:54 PM
#39
i have this problem on mine. its a 24v cosworth in the P100 and it works perfectly then sometimes the rev counter reads half what it should, so 3,000rpm rev limiter however it sounds as tho its revving out. so it is the rev counter.
then il fire it up next day and the rev counter works perfectly. any ideas what this is caused by
then il fire it up next day and the rev counter works perfectly. any ideas what this is caused by