Changed injectors. Now won't start!

Hi all. Popped a new set of injectors in my 2004 Freelander td4 diesel (m47 engine) new rubber o rings, new copper washers, the lot. Seemed fairly easy, just a case of simply swapping new for old. Came to start it and..... Nothing! Turns and turns and turns but won't fire at all. Any ideas as to why or any advice gratefully appreciated

Air locked undo all the injectors and crank it until fuel comes out of each one then do them back up again is their a manual pump on the fuel filter?

biketeacherdave said:

Air locked undo all the injectors and crank it until fuel comes out of each one then do them back up again is their a manual pump on the fuel filter?

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agree,think it's self priming , but like u say certainally wouldn't hurt that's for sure , no there isn't any manual pump on these ,

u havnt accidentely left any sensor wires off anywhere have u, the maf , or map ???

Thanks for the advice guys. Will undo the injectors and hope it's an airlock!

It is, that is all

It isn't. That is not all! As it turns out there seems to be an electrical problem. Had the mechanic out and he has diagnosed an issue with the crank sensor. Of the three wires coming out of it, two are positive and one is negative, whereas one should be negative, one should be positive and the third should be a feedback. Two wires touching somewhere? Is it possible to find out where? Is it limited to just this wiring loom? In the words of olive oyl.... Help!

Forgot to mention the fault code description was 'no can bus signal'

Glosterboy said:

It isn't. That is not all! As it turns out there seems to be an electrical problem. Had the mechanic out and he has diagnosed an issue with the crank sensor. Of the three wires coming out of it, two are positive and one is negative, whereas one should be negative, one should be positive and the third should be a feedback. Two wires touching somewhere? Is it possible to find out where? Is it limited to just this wiring loom? In the words of olive oyl.... Help!

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OK have you confirmed you have fuel at the injectors????? Your mechanic diag crank sensor so why didn't he change it???? Fix the problem. Seems your saying you didn't have a problem before changing the injectors so its time to start retracing your steps in case you have crushed some wires

There's definitely fuel at the injectors. I've released the nut at the top of the injectors with the pump on and let any air out one by one. The mechanic tested all fuses and connectors etc with his multimeter and found that the camshaft connector (top of engine, near first injector) which has three wires coming out of it was showing two positive and one negative. His suggestion was two wires touching somewhere else on the loom. I thought I might have crushed some when refitting the inlet manifold or something, but I was pretty careful and can't find any sign of crushed wires

So find where the wire goes somewhere it will terminate in a block connector going into the loom disconnect and retest the wires

Grab a Haynes manual, have a look at the wiring diagram and trace the wires back, did he check while turning the engine over, on some they have two lives one could be a feed to another sensor on the same system, you'll not know until you get a manual mate, if you'd have trapped a wire it would have made the cicuit negative as the engine is earthed leaving two negatives, this wouldn't blow a fuse so it's not that so I'd say it's doubtful a trapped wire, you either loosened a wire or pulled one out, if so you'll need to find it and re do, if it was ok before and you never played with any wiring I'd definitely say it's a mechanical fault, but hey it's a Mandy, good luck

Just a quick thought, did you check the rubber seal on cut off switch at the back of the high pressure pump, if it's knackered the pressure goes back to the pump not the injectors, sometimes it will get to the injectors but then will not get forced into the cylinders, these things can happen while moving things around, again just a thought,

Well. Thanks for the advice guys, but I am now officially at the end of my tether! I checked all of what has been advised. So, here is where I'm at. There is definitely pressure at the fuel injectors, when the pump is on and I crack the nut to the injector, fuel squirts out, also no airlock that I can find. A mechanic diagnosed an electrical fault code (no can bus signal) and suggested a frayed wire somewhere in the loom, I've swapped the entire loom for a new (second hand) one but still the same problem persists. If there is anyone based in the north east who fancies a mercy mission to rescue both my motor and my sanity, the bacon sandwiches will be on me!

Glosterboy said:

Well. Thanks for the advice guys, but I am now officially at the end of my tether! I checked all of what has been advised. So, here is where I'm at. There is definitely pressure at the fuel injectors, when the pump is on and I crack the nut to the injector, fuel squirts out, also no airlock that I can find. A mechanic diagnosed an electrical fault code (no can bus signal) and suggested a frayed wire somewhere in the loom, I've swapped the entire loom for a new (second hand) one but still the same problem persists. If there is anyone based in the north east who fancies a mercy mission to rescue both my motor and my sanity, the bacon sandwiches will be on me!

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Wish I was nearer mate I would spend an hour or two, it's a matter of elimination I'm sure, with these motors There's always an answer without spending fortunes, good luck mate.