Rover K series injection question
Discussion
Sorry about the subject matter chaps 
Rover K series single injector appears not to be firing
Can anyone tell me if this is E.C.U controlled & if it is, if it's likely for just this bit of the E.C.U. to fail ?
The plug into the injector has a feed on one terminal but no pulse on the other to fire the injector.
Fuel pump/H.T. all working & cars fires ok for a few seconds with a bit of direct fuelling
Rover K series single injector appears not to be firing
Can anyone tell me if this is E.C.U controlled & if it is, if it's likely for just this bit of the E.C.U. to fail ? The plug into the injector has a feed on one terminal but no pulse on the other to fire the injector.
Fuel pump/H.T. all working & cars fires ok for a few seconds with a bit of direct fuelling
As far as i know no imobilizer, it hasn't even got an alarm... aldi said:
I think usually theres no 'pulse', theres just 12v to one pin and the other is driven to ground to fire it.
Edit: If it didnt run OK on direct fuelling I'd say cam/crank sensor.
Hi Neil,
Fuel pump/H.T. all working & cars fires ok for a few seconds with a bit of direct fuelling
I'm not very good with electrics but could the crank sensor drive it to ground (what ever that means
i presume fire it ) Seasider said:
I think usually theres no 'pulse', theres just 12v to one pin and the other is driven to ground to fire it.
Edit: If it didnt run OK on direct fuelling I'd say cam/crank sensor.
Hi Neil,
Fuel pump/H.T. all working & cars fires ok for a few seconds with a bit of direct fuelling
I'm not very good with electrics but could the crank sensor drive it to ground (what ever that means
The injector has 12v to one pin all the time when the engine's running, but the other pin itsn't connected to anything so its basically closed untill the ECU grounds the other pin, meaning current can flow, meaning the injector then opens. It will be too fast for a multimeter to catch really only fractions of a second at a time.
The reason I mentioned the cam/crank sensor is that if that was duff, the ecu can't see that the engine is turning and won't fire the injector. But if it runs on direct fuelling, then the sparks are going, so it can't be that! Question is is the ecu triggering the injector, which it *probably* is since its triggering the sparks OK. If it is why isn't petrol coming out? Is there a take-off to check the fuel pressure somewhere near the throttle body? Can you hear the injector ticking at all? Are all the grounds around the engine bay OK?
Whats prompted this, has any work been done recently?
aldi said:
Question is is the ecu triggering the injector, which it *probably* is since its triggering the sparks OK. If it is why isn't petrol coming out? Is there a take-off to check the fuel pressure somewhere near the throttle body? Can you hear the injector ticking at all? Are all the grounds around the engine bay OK?
Whats prompted this, has any work been done recently?
Good pressure on the fuel inlet,(but not measured) can't hear anything on the injector & cleaned two earths that look relevent(battery to chassis & engine).
No work done, it just started running rough after being started from a 10 minute stop, then died 20 minutes into some intermitent running.
My father has picked up a crank sensor today so will try that.
(fingers crossed it's the right one
)You should be able to confirm that the injector is being triggered by the ECU by connecting a NOID diagnostic light (basically a small filament bulb or LED with the correct voltage+current rating) in parallel with the injector. You won't see the individual pulses once it's running, but you can judge the proportion of time that the injector is held open by the brightness. You need to know the electrical characteristics of the injector though, to get the right bulb/LED rating.
GreenV8S said:
NOID diagnostic light (basically a small filament bulb or LED with the correct voltage+current rating) in parallel with the injector.
Would a NOID light be disk shaped? if so this is why the AA guy pointed at the injector not firing!
Not being that good with electrics, but i also appear to get a circuit on the wires from the injector plug to just behind the ECU plug (the old stick a pin in the wire trick
) In my eyes this all pointing ECU! Just seems funny that everything else it controls is fine
I can see a call to the scrap man & a trip to Chelmsford auctions, as this costing me a fortune in taxi's to the train station
aldi said:As in direct wiring from battery ? Impotence
Still worth checking all the grounds you can see, and pigeon's 12v to the injector idea too... Can you measure the impedence of the injector?!
No, as i said i'm sh!te with sparkey bits 
aldi said:I've been delaying the extra impact for nearly 3 yrs just not sure i can carry on the good work
think of the enviromental impact of chucking a Rover 214 away
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