Thread: Changed a td5 injector, now won't start

Originally Posted by finallyrangie

Tried rolling it over with with some start spray, it fires when it gets some spray in the inlet, so the problem is lack of fuel.

Not necessarily. Compression ignition engines will run as long as there is, well, compression, and the valve timing is ok. Start spray will fire regardless of the engine's fuel supply. So, lack of fuel being injected will be the problem, and that requires a combination of things, most of which have already been mentioned.
I would still say the CPS, except you are getting an RPM reading.....

So back to the start, you changed injector cos running rough as and disconnecting injector made no difference so replaced that injector and code is correct,correct?
Adjustment is correct on injector?
How was the the copper washer?
Maybe you need to pull all injectors and replace copper washers and o rings.
Ecu harness was checked for oil I think I read so I’d be going to copper washers.

Some of this has already been mentioned... But...

If you can see RPM reported on the nano, it's not the CPS.

If you can hear the injectors clicking, it's not the wiring or plugs.

If you haven't got any faults showing, it's PROBABLY not noisy crank signal.

But it's probably something you did touch, assuming the fault was indeed a dodgy injector and not a failing ECU.

Make sure the ECU is not immobilised(unlikely).

My money would be on the injector bumps not set.

Also unlikely that injector seals would stop it running after a purge cycle... They will stop the engine running after a little while though if bad enough.

Remember, if it was running, you did some work and now it's not, it's something you touched.

It can also take some cranking to get them firing after fuel system integrity has been lost.

Cheers

Originally Posted by RobMichelle

Maybe you need to pull all injectors and replace copper washers and o rings.

This ^^^

Originally Posted by shack

It can also take some cranking to get them firing after fuel system integrity has been lost.

Cheers

And this ^^^

Also, when doing this sort of work, after the 1, 2 or 3 purge cycles you will need to do, hold your foot flat on the go pedal until you feel it's trying to fire, then ease back.

Sometimes, if the copper washers are bad, no amount of purge cycles or cranking will get it to fire.

Spotless is what you need everything to be when doing the job, no carbon anywhere.

on the head side of where the washers sit, I use a valve lapping stick with bits of nylon scourer pad stuck on, cleaned frequently with brake cleaner.

Originally Posted by discorevy

.

Sometimes, if the copper washers are bad, no amount of purge cycles or cranking will get it to fire.

Far out! That surprises me, but you've got the runs on the board! I'll happily yield....

Only thing that hasn't been mentioned is the fuel pressure.
There is no sensor for the ECU or nanocom to read it, so only way to check it is the old way. As you said it's running rough ... could it have been running rough due to bad FPR? or something.

Pressure reading kits are fairly cheap nowadays ... or buy a Ford/Bosch pressure reg for it.

I don’t know anywhere near as much as you blokes but I’m confused as to why the washers would be the problem if the OP only replaced one injector.

Originally Posted by shack

Far out! That surprises me, but you've got the runs on the board! I'll happily yield....

Haha, got a few yourself, I've only seen it twice.

Originally Posted by AK83

Only thing that hasn't been mentioned is the fuel pressure.
There is no sensor for the ECU or nanocom to read it, so only way to check it is the old way. As you said it's running rough ... could it have been running rough due to bad FPR? or something.

Pressure reading kits are fairly cheap nowadays ... or buy a Ford/Bosch pressure reg for it.

Yep, always worth a check at the engine end

Originally Posted by Tins

I don’t know anywhere near as much as you blokes but I’m confused as to why the washers would be the problem if the OP only replaced one injector.

If the combustion pressures were breaching the fuel gallery enough to make the engine run rough before the injector was changed ( was a new washer used at the time? ), then, especially if other washers are also faulty, every time the engine cranks, it just puts more air into the gallery.
This will never allow the injector(s) to gain the pressure required as they're trying to compress air rather than diesel.