fogulbennett

Hey folks i have a cvh running cosworth inlet and cosworth management had it running good in a fiesta now just put it in a escort cab! Only thing that is diffrent is the fuel pump is on all the time no relay and i have changed the injectors from dark greens to yellows to stop over fueling! I did have the inlet off to fit engine but thats the only things i have changed. When i start the car its perfect for like 2 seconds then it revs up to about 3000 itself and stays there and when u rev it it takes awhile to return to the 3000 revs? Any ideas guys? Thanks

Chip

iTrader: (3)

For it to rev as high as 3000rpm requires a fair amount of air.

Have you tried unplugging the ISCV and seeing if that drops it?

Have you tried adjusting the throttle stop screw on the cossie throttle body?

Any leaks in the plenum or inlet manifold gaskets?

What chip is in the ecu, if its intended for greens and you've fitted yellows FFS dont drive it hard, it will melt!

fogulbennett

i havnt tryed to unplug it mate i will try that and i dunno if it is 3000 it just a guess but does seem high the throttel screw hasnt moved since engine ws running fine in the old car, and not sure what chip it is running only put the yellows in it so it can go through an MOT! thanks

pee vee

sounds like its drawing in air from somewhere, like chip suggests!

check all your pipes and bungs on the inlet system.

Rob_DOHC

iTrader: (4)

As above, Idle speed control valve stuck open or you have a large air leak after the throttle body.

You've taken the inlet manifold off so anything around the manifold is suspect.

Rob,

fogulbennett

ok thanks guys ill give it a try tomorrow

Versus_Creations

iTrader: (1)

Its not an air leak.

The management system has picked up an error and causes the ISCV to open thus having 3000rpm.

Chances are one of the sensors has picked up and error. Phase sensor, TPS, H2O, ACT has an issue of some kind.

It wont be the CPS as its running still, or the map sensor or the chip. However you cant just change the injectors without having the correct chip to run them.

Who put the management on and who's chip is it running.

Any pics as this would help.

fogulbennett

i will change it back to dark green see if that is the cause of it ill let yous no how i get on cheers

Chip

iTrader: (3)

It is air getting in from where it shouldnt

Such as via the ISCV being open when it shouldnt, hence I said to try unplugging it, as then we'll know if the ecu is introducing this extra air or if its leak from somewhere else.

Rob_DOHC

iTrader: (4)

As Chip says unplugging the valve eliminates the ECU from the problems list, next up would be a stuck ISCV.

But an air leak will cause a high idle RPM. An ISCV is essentially a controlled air leak, any leak after the buttery fly could cause this.

Rob,

Versus_Creations

iTrader: (1)

No.

The valve is being told to open and doing what its ment to when it has an error. So air is getting in from where it should.

The valve is not the issue if you unplug it the rev will drop, but the error will still be there so that fixes nothing!

fogulbennet
My advise, take it to a tuner with a laptop and software to be able to give you the exact reason why the management picked up an error.

fogulbennett

Can only be injectors as it never done it a week ago with greens in it and i did unplug the iscv and the revs dropped but was rev up and down and chockin up

Chip

iTrader: (3)

The wandering revs are probably caused by the fuelling being out.

Putting the other injectors back in may help, but obivously what it needs is a decent remap to suit the bits and the engine you have etc.

Rob_DOHC

iTrader: (4)

I don't think Chip is suggesting unplugging the ISCV as a solution. Just a method of isolating the problem, ECU, ISCV or air leak.

All three things can cause this problem. My idle speed was 2800 rpm the other week, the problem was a sticking idle valve, similarly, if you unplug a vac line and create a small vac leak the revs will rise. And like you point out the ecu may hold the valve open because of a sensor error.. and as you say someone with the appropriate equipment would be a great help.

Rob,

Chip

iTrader: (3)

Indeed, just a case of working through the options.

fogulbennett

i changed the injectors and it does the same think is there anyone in scotland that can do a remp of it or at least set it up abit better?

Rob_DOHC

iTrader: (4)

AVA are in Scotland aren't they?

Test your sensors, if you have a multimeter this will be easy. Just go over the whole thing systematically until you find the problem.

fogulbennett

do you no what the readings should be for each sensor? thanks for the help guys

Rob_DOHC

iTrader: (4)

I've got them written down some where, if i don't find them i'll measure the ones on my car. Do a resistance check on the CLT and MAT sensors. Im not sure if the TPS could cause this fault (Jano should be able to tell you), like Jano says its not your CPS.... Im not sure how you can test your map sensor, Perhaps suck on the tube and see if it effects how the car is running. If it does the MAP is probably okay.


Rob,

Versus_Creations

iTrader: (1)

Every sensor can be checked with a multimeter even the map sensor so you dont need to try sucking on the pipe

Honestly pal, take it to a tuner who wont rape you for fixing it. There is no one that far up in the UK i would advise you to take your car to. The closest that i say would be worth while is Stu@msd as he will be able to tell you within minutes with a laptop, Karl@nms will be able to do the same, or closer south take it to SCS.

There are better places to take a cosworth converted or managed engine, even better places to get help from but thats up to you to do research.

Im confident in saying that under Ł100 should fix your issue! So dont pay more

Regards
Jano

fogulbennett

i would nt have a problum taken it to the tunner but i have no way of getting it there as car not mot or tax and also dont have a trailer sadly need to sort somthing out

Versus_Creations

iTrader: (1)

You need a wiring diagram, and a multimeter.

Then test the TPS is set correctly around at closed throttle, then reads WOT. Checked with voltage and ohms.
Phase sensor is getting a reading from the trigger ring if you have one. Can be checked with volts and ohms.
ACT and H20 sensors are both reading back to the ECU and showing correct voltage.

If these are set and working as they should do, the rev issue will be no longer, obviously if you have set the phasing correctly and the CO% and idle screw are set correctly and the other sensors are working without issues.

Of course you must have a correct chip for your spec, not just a random Cosworth chip as this will never work. Hence why i asked where the chip for greens came from. Not many companys will offer chips for this sort of setup.

Well actually they will.... Just it wont work because it will more than likely be a cosworth chip or a copied chip from another tuner which they dont know the full spec for.

You would be surprised at what chips i have seen fitted to customers cars

Rob_DOHC

iTrader: (4)

Why would that be a problem? One pin should be 5v another should be GND with a 3rd giving a varying voltage, sucking on the pipe would let you at least see a changing value.

Why don't you give him some figures so he can test his sensors?

Versus_Creations

iTrader: (1)

The map sensor wouldn't cause the issue he has.

All the measurements and data i have already posted up on the net, a little research should uncover them.

Rob_DOHC

iTrader: (4)

Ah good stuff.

fogulbennett PM me if you want the link to the site Jano has mentioned.

Rob,

fogulbennett

Heres a video of the car and what it is doing it never reved so high this time but still reving itself anyone had this before? thanks guys

bigkev

sitech in rosyth mate hes good

fogulbennett

He cant do cossie stuff mate

fogulbennett

any help guys??

bigkev

looks lik its over fueling, colour of the exhaust fumes, what exactly hav u done to try n make it run better

fogulbennett

ive tryed to chancge everything i have chnged checked the tps seems fine and it defo is overfuelin ive re gapped the phase sensor checked over the loom dont understand whats happend

Versus_Creations

iTrader: (1)

whos chip?