I think My ECU is knackered as just one cylinder (cylinder one) is filling up with fuel and flooding the FUUUK out the engine, hence a missfire on the cylinder. I have have changed the injectors and traced a majority of the loom back to find no problems so thinking Ecu is at fault sending wrong signals maybe?? cant think of anything else... any advice would be appreciated..

Ste

 

So i take it its just the 1 cylinder that is getting more fuel.I would try an ecu first then go from there.A faulty water temp sensor would cause the engine to over fuel but it would normaly be on all 4 cyilnders and cause it to run like a pile of poo.

 

yes thats correct if you take the injectors out the inlet manifold and try to crank the car over the one injector just sprays it out shoots about two metres, lol! have changed the injectors so eliminated injector fault

 

Is the car a cossie mate.

 

Do you know if the injector is pulsing ie on off on off.

 

Well i took the injectors out to check the pattern etc, the second u turn the key and activate the ignition it will pour out that one injector, but as soon as you crank it it goes into a normal firing pattern, but i think when the engine runs it is gettin a signal to pour fuel in again as the amount of fuel vapour out the exhaust is rediculous and it is bogging the cylinder down that much with fuel it is causing a missfire on the cylinder

 

Can you get your hands on another ecu?

 

Just trying to locate one, will this fit? http://cgi.ebay.co.uk/ws/eBayISAPI.d...lenotsupported


As the Ecu says 1AW 045, wheres mine says 1AW 048.
also i think mine is Marelli where his is Webber :S

thanks for this lads

 

Well if it's cylinder 1 like you have said, according to my wiring diagram the injector is connected to pin 35 on the ECU and the other side to the fuel injection relay (M11), every injector is connected to that relay so it's unlikely the problem is there, more likely with the signal coming from Pin 35 side.
P.s I tell eveyone this as it's a good tip i learned off someone else on here, if you want to test the injector signal, take out one of the bulbs from your front sidelights and bend the contacts, it will plug into the injector connector, you will see the bulb flash as you crank the crank the engine, much less hassle and less messier than testing it with an injector plugged in.

 

What is the history here? Did the car just stop and this is teh result?

More likely I suspect is that you have had it apart and now it wont start?

 

so could stand a good chance of been Ecu then?

 

Lol, no idea, but based on the info you've given the signal to open and close comes from the ECU, so something is telling it to do that, so either it's faulty, or it's getting information which is telling it to do this. I'm not really clued up how it funtions, Stu is your man when it comes to stuff like that.

 

i just happily driving and a slight missfire started drove it like 15 mile home, switched it off, switched it on and had a missfire, hadnt messed with nothing at all! so here i am

 

And its a Punto GT?

 

NO LOL! its a sierra cossy P8 ecu.

 

Oh it's a p8, I'm not sure if that wiring diagram is accurate then...

 

Thanks mate!

 

Damn it thanks anyway mate

 

will this fit? http://cgi.ebay.co.uk/ws/eBayISAPI.d...lenotsupported


As the Ecu says 1AW 045, wheres mine says 1AW 048.
also i think mine is Marelli where his is Webber :S

 

What car is it then an escort or an sierra, why has it got a P8, you can't just plug that into any cosworth loom, I take it you haven't just tried to do that??? P8's are from an escort, is it a sierra you have?

 

I have a P8, but it is a super 8 version that controls 8 injectors, not sure if this could be used to try out on your car? If anyone can confirm I can just swap the chips then you are more than welcome to try it and see if it helps?

What spec is your car? what injectors are you running?

 

Its a Sierra, the ecu it has been running on since i have ever had the car says p8, never any problems with it until now.... im running stage 3 Dark greens with a stage 3 ahmed bajoo chip i am to believe....

 

Is it RWD or 4x4???

 

From my limited knowledge, it sounds like one of the earths for the injectors is being held permanently open, not got a clue what would cause this but I believe that the p8 suffers from this / burning out quite a bit?

 

that 1 on ebay will work, most weber marreli ecus work on early cossies its just when you get to the cat models late 4x4 and escos's have lambda sensors im not sure about but that 1 will be fine

 

What about the TPS, you need to swap the wires round if it's a 2wd IIRC

 

Didn't know this

Could be worth a look.

 

Yep I would think you have a short to earth on the switched feed for your injector. Have you swapped injectors from say cylinder 1 to 2 and still the same?

Un plug the ECU and test the switched pin at the injector for continuity to earth to see if you have a short in wiring. If not it may be in the ECU.

LED test light across the pins will also tell you what is happening across the injector.

 

RWD mate

 

Would think injector 1 has got permanent earth connection, check the earth back so if its chaffed where it goes through firewall etc as it can use this as an earth and hence your injector will be permantely live.

(Injectors run constant live btw)


Martin