Coil.....rev limit??

Chachito

Member +
Hi guys I know I all ready posted this but did not get a reply got a few, but still with the same problem. Here at the local people I've heard that maybe it has to do with my coil that the car rev's till 4500 rpm (rev limit). Please help if someone could tell what I can look at for the rev limit to work the way it's suppose to.
 

Chachito

Member +
Is there a way to know if the coil is working properly ?

forgot to tell that I'm still on stock ECU and only thing I've changed is I went to FMIC HDI that's the only change I did to the car. It started to this all of a sudden it didn't do this so don't know what's wrong.
 
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Chachito

Member +
I don't know last that i drove it the top speed keeps gaining till the cluster limit 180km/h but the rev limit comes till 4500 rmp. But this it started to do it a few weeks ago cause like 2 or 3 months ago it reaches 7000 normally
 

weeJohn

Lifer
Does the engine sound like its revving to 4500 rpm or to 7000 rpm when it cuts out?

Does the check engine light come on when it cuts power?

The rev counter picks up a signal from the coil and it goes straight to the tacho, there is a different wire for the ecu rev reading and thats the signal the ecu uses for the rev limit. If the car is driving normally and the only weird thing is the reading on the tacho the problem lies there.

If you have a fmic, exhaust and better air filter on, boost rises slightly and gets near to fuel cut, that can prevent the engine revving out fully.

Fill us in on these details and its easier to narrow down a possible cause.
 

Chachito

Member +
Yes I have a HDI fmic ,2.125" exhaust changed from front to back and racing filter.
To be honest I think it sounds like it's reving at 7000rpm but were do I find this rev counter a other thing that I've noticed is when I rev my car the rpm gauge stick walks the rpms really slow compared to my freinds Glanza, something I know it keeps gaining km when i'm pushing the car.
 
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weeJohn

Lifer
The rev counter signal wire is IG-, its a black, screened wire that comes from the coil and it can also be found at the diagnostics plug, on the side.

Its an electrical problem, its either a bad connection in one of the plugs the wire passes through or the tacho itself is bad in some way.

If it was me I would start by checking the back of the instrument cluster, find the IG- wire and have a look at the trace running from the socket on the back of the cluster up to the tacho itself. If that looks ok then get a multi meter and check the resistance to the diagnostic plug. If its below 0.2 ohms then the wires and connections are ok.

An auto spark with the right multi meter should be able to tell if the signal coming up the wire to the cluster is reading correctly as per the engine revs, if you are not sure about working with wires then this is your best bet.
 

Sheldon

Malta Area Rep.
the way your describing it its the tacho being out. i would buy a cheapish rev counter and fit it to see if thats the problem
 

Chachito

Member +
that's my problem don't have the money to do that and I know a little bit of electricity I just need to know how it looks like
 
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