940 Diesel Not starting

[BenVol]

Fantastic, much appreciated 🙂

[Laird Scooby]

Simple check to see if the glow plugs are getting a feed, connect your voltmeter +ve probe to the bus bar on the glow plugs and -ve lead to a good earth and switch the ignition on. It should read battery voltage for a few seconds. That will test the relay and its contacts because the existing glow plugs should give it some load, even if they're weak.

When you renewed the fuel filter, did you fill it full of fresh diesel before fitting it? If not, the IP (injection pump) won't be getting any fuel as there isn't a lift pump on these, so i've been told.

Also a common problem on Bosch VE pumps is the engine cut solenoid. They fail usually in the open position meaning you have to stall the engine after switching the ignition off.
However they have been known to stick in the shut position, especially if they haven't been used for a while. Worth checking. I believe later models had a different fly-by-wire set-up and the stop solenoid wasn't so unreliable. Single wire to it on the side of the pump. If you remove the connector and run a wire from battery +ve to the terminal, you should hear the solenoid click if it's working, if not undo it with a spanner (19mm rings a bell but might be wrong), remove it and check the plunger is free to move in and out. If not, clean it with some carb cleaner until it does. Refit and test after making sure you've got fuel in the pump.

[BenVol]

Thank you so much, a lot of things to get on with checking , great to get some help with people familiar with these wagons 🙂

[tofufi]

Originally Posted by BenVol

Hi everyone, new to site and it looks to be a wealth of info and enthusiasm. I have just bought a 95 940 Diesel. New diesel in, new fuel filter and battery....turning over freely. It was starting a year ago as I know previous owner. I know these oil burners need their heater plugs....so these may be faulty. I have 6 ordered from ebay but until they arrive would most people agree this is the next thing to do? I can hear the click of the relay...so I'm assuming this means it is working. I have no engine manual....where is the heater plug relay....and has anyone any other suggestions? 🙂 thanks guys

How confident are you that fuel is getting to the engine? I had a diesel which wouldn't self prime and needed a priming bulb to circulate the fuel before it'd run.

[oman5]

These are self bleeding, if you filled the filter with fresh diesel it should fire right up. If you didn’t, it will take a LOT of cranking to refill it and prime the system, and probably flatten the battery before it starts. They also won’t start without working glow plugs, ever. The fobs ARE for remote locking and for the immobiliser, but as long as the immobiliser wasn’t set in the first place (as seems likely if the fobs don’t have batteries) it should start ok

[jpliddy]

lets get them glow plugs checked A.S.A.P. when you get to number 5 and 6 plugs
i get a thick piece of carpet over the engine to sit on be careful though remove the intercooler pipe and EGR bits on top of engine at back .
i do not have to remove any of the diesel supply pipes but did remove the rubber leak off pipes . i woud replace all the glow plugs personally . i use a cranked ring spanner with thee small notches not the box type . the job is quite slow for me . being a carpenter . there is very little turn on the buzz bar nuts and the glow plugs ive replaced mine im sure 4 times in 20 years! so im proof it can be done . be careful not to drop or get any debris into the glow plug holes! so old plug out and new plug in! i was told to put a small amount of copper ease on the new threads as they will come out easy next time
hopefully your old plugs will come out easy too
these comments are only my experience only !
if you need further help please email me at jimliddy1@gmail.com i will be happy to help all i can .

[BenVol]

Thanks guys, heater plugs just arrives... will try and fit them fitted this week and hopefully it will fire up!!

[05XC90]

Get the finger out lad and get it fired up so you can start driving a real car

[rwdkev]

Originally Posted by BenVol

....turning over freely.....and is getting fuel.

So it's not firing up at all, just belching out lots of white smoke then....?

[tofufi]

Originally Posted by oman5

These are self bleeding, if you filled the filter with fresh diesel it should fire right up. If you didn’t, it will take a LOT of cranking to refill it and prime the system, and probably flatten the battery before it starts.

They're meant to be, but as mentioned I've had one which didn't self prime. Presumably the pump was a little tired...