406oc.co.uk

Hi guys...

I'm having major probs...my 406 (xud9te) was stilling for a few weeks and i found the battery dead....had to replace the battery and now it's refusing to start at all ....

After fiddling around (removing one injector pipes and cranking) found that fuel is coming only as far as the pump but the pump is not letting fuel on to the injectors....tried another battery...two batteries in parallel....pushing...pulling with another car ...but no life at all....the car doesn't have a immobilizer so thats not the problem....checked the cam angle sensor...thats giving a voltage around 2.5V..is that about ok???

have any thoughts why no fuel is allowed by the pump??? I'm thinking the fuel cut off valve is not opening...is there a way to give power to this vave directly just to see if that the prob(or not)????

Any help is much appreciated....thanks

it could be the stop solonoid on the pump

pugSL wrote:the car doesn't have a immobilizer

Are you sure? I thought they all did!
If you've removed it then fair enough but it seems a coincidence that it won't start having removed the battery...

It's not got one of those cut out switches on the l/h suspension turret has it? Never overlook the bleedin' obvious

If it's not got an immobiliser keypad, then the thing is built in to the column and is deactivated by a chip in your key.

I would certainly have a crack at replacing the stop solenoid, stealer should sell you one for about forty squids IIRC.

Failing that, mayhap a new pump is in order?

thanks for the help guys...

It doesn't have a immobilizer key pad....so i assumed there is none....so as swiss is saying it must be in the key...since i've removed the battery have i accidentally reset it or something. Is there a way to undo what i have done?

Steve what are the cut out switches on the suspension turret? I never knew about them...how can i check them?

Have I got the stop solenoid? Is ti possible to remove it while the pump is still in the car or give it a supply directly ?

Local motor factor should have the stop solenoid for about 15-20 quid.

All mechanical diesels have one.

On the 406 you need to demolish the steel cover to get to the solenoid so you normally have to bypass the immob circuit afterwards (very simple job)

Consider, the 1.9 has a mechanical fuel pump. Therefore once the engine is running it will continue to pump fuel and draw in air as long as it is running.

Since the diesel engine is compression-ignition, it will continue to run as long as it is supplied with sufficient air and fuel.

Therefore one requires a stop solenoid to cut off the fuel supply when the engine is to be shut down

This solenoid can fail, either cutting off your fuel supply or leaving it jammed on

can't imagine which is worse...a car that wont start..or a one that doesn't stop....

got some time to fiddle with the car. I managed to remove the back of the pump while still on the car. There are some non return valves that the fuel pressure must overcome to let fuel to the injectors....the fuel is not getting through those it seems...since fuel comes up to that point i guess it's not the solenoid. So I'm guessing the pump is not producing enough pressure so decided to remove the pump and get it serviced....then I can exactly figure out what the problem is.. it could still be the stop solenoid but in any case the pump is coming out..

and guys i think i should have mentioned this a bit earlier... I'm actually not from UK I'm from Sri Lanka... so finding parts for Europeans is a bit tough although there are some dealers around

Removed the back of the pump? Was the cover on the stop solenoid? Or the unit where the injector lines connect?

Don't go throwing money at a pump technician yet, give us a few pointers to what you've done so far.

http://www.eastment.net/Boschpump2.htm <- might help you visualise things.

pugSL wrote:... I'm actually not from UK I'm from Sri Lanka...

Proof that even folks from abroad are daft enough to buy these damn things!

StevieboyTD wrote:

pugSL wrote:... I'm actually not from UK I'm from Sri Lanka...

Proof that even folks from abroad are daft enough to buy these damn things!

Errrr

These damn things are made in France - we UK people are also included in the "daft folks from abroad" category

StevieboyTD wrote:Removed the back of the pump? Was the cover on the stop solenoid? Or the unit where the injector lines connect?

Don't go throwing money at a pump technician yet, give us a few pointers to what you've done so far.

http://www.eastment.net/Boschpump2.htm <- might help you visualise things.

Thanks Stevieboy nice stuff...its the unit where the injector lines connect...interestingly the immobilizer is gone i think..someone must've got there before me i think

come to think of it the car seemed a bit under powered and was drinking more fuel just before this episode started...indication of imminent pump failure?

StevieboyTD wrote:Proof that even folks from abroad are daft enough to buy these damn things!

...tell me about it.....

Ahh, if you've opened up the end of the pump then it has to come off the engine to be reassembled (things need to be lined up exactly and fitted with the pump pointing down) DO NOT TRY AND REFIT THE PIECE ON THE LEVEL, YOU WILL BOLLOX IT!

Those non-return valves are the fuel outlet springs which last pretty much for ever, they won;t be a problem.

Time to get the pump off and spend an afternoon chucking it back together.

http://etc.gnarlodious.com/Vanagon/Bosc ... build.html <- is another useful page. It's a translation from french i think so sometimes it's a bit disjointed.

Opps...ok so out comes the pump