got no power to the injectors whats a way to fix it

thanks

dave

 

bump ?

 

have you got the connectors for the crank and phase sensor the right way round?

 

check everything is connected

 

it was running friday when i put it into the garage had to push it out today as it would not start checked for power at the injectors and no power everything is connected the right way round aswell

 

you say no power, is it no pulse? phase sensor or crank sensor issue ?

 

no pulse has got a recentley new crank sensor and recentley new phase sensor got spark but no power / pulse

 

Are you sure its injector ? have you checked spark and fuel pump first ? (sorry always start at the begining )
fuel cut in boot?
spark at plug ?
pump priming.?
Have you changed anything latley ?
Fuel in car ?

Cheers Al

 

The injectors are permanent live so sensors etc are irrelevant, so if injectors have no power I suspect the ECU relay faulty and if so the ECU won't power up either

Martin

 

nothing has been touched in the boot
sparking at the plug
pump is priming
not changed anything it was running friday
it has petrol in the car

cheers

 

Pump will still prime if it is ECU relay fault as there is another one for this.

Martin

 

martysmartie, you say you suspect the ECU relay if it was that wouldnt it spark ?

 

No as the ECU would have no power, come to think of it the pump probably would not prime either, easiest way to test is check you have power at pin 20 at ECU.

Martin

 

right ok then,is there anything else it could be as you say it wouldnt spark or pump wouldnt prime otherwise

 

I presume when checking the power at the injectors you used an earth other than the injector earth wire, with igniton on?

If all four injectors have no power I should think you have a wiring problem.

Martin

 

DON'T check the earth at the injectors with a test light, this may damage the injector drivers in the ecu.
The fuel pump is controlled totally by ecu output so if it primes then ecu is getting power, if no live at the injectors then check the main power relay is outputting, this ends a live to the ecu and the same relay sends the live to the injectors, most likely a dodgy wire.
tabetha

 

well the pump primes there is no pulse at the injectors just one problem after another with it

 

Why do you believe there is no pulse at the injectors as there is no way you can really tell unless you have the likes of a NOID light.

Martin

 

and that is what we used to test it with

thanks

dave

 

Ok, so I would next check you have power at the injectors if not will be a wiring problem.

Martin

 

we did not have power at the injectors right ok then where should i start..

 

If you defo do not have power at injectors at the LIVE feed then as said it will be a wiring problem after the ECU relay as we have established the ECU is getting power and they share the same feed.

Martin

 

I personally would be looking at other possibles other than a whole injector loom gong down when it hasn't been touched and the car was runing fine. one assumes the car has an immobiliser other than standard key code system ? . do you know were the cut's are for it and have you tested them to rule it out? . have you tryed another key incase the chip isn't reading correctly ?
Cheers Al

 

Where are you based chap ? i have a set of Noid lights if they are any help ?

 

right ok then..i will check as you say the relay.and i have a set of noid light mate had no pulse or power. all the immoblizer is fine and alarm...its weird it was running fine now nothing

 

saph al thanks for the offer mate..

dave

 

were abouts is the relay.

 

All i can suggest is that you check your earths are spotless and start checking the loom back to your ecu. Also may be worth getting hold of anther ECU to plug in and just rule it out ?
Cheers Al

 

Not replacing it just checking it, easy enough to do, it has spark,fuel pump priming and it turns over so doubt it's immobiliser.

Martin

 

martysmartie were is the relay ?

 

The fact the ECU powers up shows the relay to be fine!

Martin

 

Almost certainly behind dashboard passenger side, at least they are on Sierra's.

Martin

 

http://www.bigturbo.co.uk/main6.htm

 

thanks al much appreciated

 

should be the brown holder under the N/S of the dash . (90% sure )

 

right ok mate thanks for everyone's info and input

dave

 

checked down by the ecu there are 2 relays with 2 fuses in them none of the fuses are blown... the revs used to jump when cranking

any idears

many thanks

 

Probably a long shot mate but are all the crank pulley lugs ok?! ie all 4 of them......

 

wouldnt that effect the spark ? i have no power/pulse at injectors car fucks me right off haha

 

When I broke a lug off mine i had problems with sparking and injector pulsing!!! Like i say long shot if u just put it in a garage before fault but worth checking as it took me a while before I thought of checking the lugs!!!