Bosch Idle Problems with smoke

[Ben Jay]

[4WayDiablo]

leaky injector? or injector problems

[Ben Jay]

hmmm how can i check? if i stuck a lucus in to see will it work ok?

[4WayDiablo]

lucas injectors on a bosch suck ass so i hear.

the reason why i say this is because mine a few weeks ago was in the same state, but now is a lot worse haha its misfiring a lot and can stall sometimes lol, i also get the smoke

[Ben Jay]

so new injectors on the cards?

[4WayDiablo]

well id wait for someone else to cast thier more expert eyes over it but like i say mines the same and i KNOW 1 and 4 cyl injectors are leaky/ faulty

[Ben Jay]

any of the other derv heads know?

[Poodle]

That's just like mine fella, mines letting in air/leaking fuel, does yours need to be primed at all to get it to start without cranking for ages?

[Ben Jay]

no havnt had the need to prime it yet. it is a bit of a pig to start though

[Poodle]

Someone mentioned valve clearances the other day, going to check mine when i get some spare time. Not hopeful, but it's a free fix if it's true so rather eliminate it first.

[mark_airey]

no havnt had the need to prime it yet. it is a bit of a pig to start though

If you prime it before you try to start it you will find it won't be as much of a pig to start, just pop the bonnet and squeeze the grenade thing until it goes hard and then try to start the car

[Ben Jay]

could this be a pump problem? meaning the pump has had it?

[mark_airey]

could this be a pump problem? meaning the pump has had it?

No, its a fuel system problem meaning there is a leak somewhere (favourite is the filter housing) meaning that when left standing all the fuel drains back to the tank, try priming it before starting the car and see if it makes it any easier to start..........

[Ben Jay]

it starts but had a play this weekend and couldnt fix the smoke.

[mark_airey]

it starts but had a play this weekend and couldnt fix the smoke.

So does priming it make it easier to start, does it start easily if it has been running and then switched off if you were to then try starting it again immediately after?

[Ben Jay]

i didnt notice a difference in the start between priming it or not.

also it does start better once its started if that makes sence lol

[mark_airey]

....................

[Toby]

it does start better once its started

:violence-axechase: :violence-axechase: :violence-axechase: :violence-axechase: :violence-axechase:

[Ben Jay]

you know what i mean! the inital start up it hard but if i turn it off and then back on its a bit easier!

[Dan!]

Almost certainly a fuel leak then

[Ben Jay]

my thinking too... but i cant see it any where =(

[Dan!]

Squeeze the hand primer until it goes hard (with the engine off) and then keep trying to squeeze it and you should be able to see/hear where its leaking from. You literally only have to look from the pipe going out of the hand primer to the fuel filter housing, then the housing itself, then the pipe from the housing to the pump, and then the pump itself. If you really cannot see any leaks anywhere it would suggest your hand primer is knackered and the one way valve is letting fuel drain back to the tank. Although id say this is unlikely if it was running fine on the lucas.

[mark_airey]

^^ unless its leaking before the primer Dan and then this won't help at all, but as you say the 1 way valve in the primer could also be feckered

Almost certainly a fuel leak then

It can't be a fuel leak though, priming it before starting it makes no difference.............. :roll:

[Dan!]

^^ unless its leaking before the primer Dan and then this won't help at all, but as you say the 1 way valve in the primer could also be feckered

It can't be a fuel leak though, priming it before starting it makes no difference.............. :roll:

The way I understand it is that if its leaking before the hand primer it wont affect running because the pump/filter housing etc will all still be full of diesel with no air ingress? And I see what your saying, but if it starts better after its been started then turned back off then I would still say air ingress, because once you start it its filled the system with diesel again... :think:

[Ben Jay]

so if its an air in the system problem why does it look like its over fueling?

[Ruan]

If a Diesel is overfuelling it'll increase in revs...

Stop thinking in petrol land... A Diesel is controlled ONLY by fuel... Less fuel = less power.

[Dan!]

It cant OVER fuel at idle mate. if there was too much fuel going in at idel then the idle/engine speed would just rise. Over fuelling only happens when the engine is under load and more fuel is injected than the turbo can supple due to the engine speed.

If there is smoke at idle its because the fuel is being injected at the wrong time in the engine cycle (i.e too soon/too late.) therefore not burning efficiently.



Is the pump diffinately in the bosch mounting studs on the bracket and not the lucas ones?

[mark_airey]

^^ Otherwise known as timing being out deja vu, think we have been here before!

The way I understand it is that if its leaking before the hand primer it wont affect running because the pump/filter housing etc will all still be full of diesel with no air ingress? And I see what your saying, but if it starts better after its been started then turned back off then I would still say air ingress, because once you start it its filled the system with diesel again... :think:

Hmmmmmmmm.....the way I understood it is that if it was leaking anywhere in the supply pipework it would drag in air when under load as its easier than sucking the fuel from the tank......

And that was sarcasm Dan, thats why I asked the question about what it was like to start after its been running, it points more to the inability to use the hand primer if it "makes no difference" IMO as that should push out all the air in the system making it easier to start

[Ben Jay]

Is the pump diffinately in the bosch mounting studs on the bracket and not the lucas ones?

the pump arrived on a cradle that i just assmued was the correct one. has any one got both cradles to hand and take a picture of the differences?

[Ruan]

It could drag air in under load, but remember Bosch ves draw about 6x the fuel they need.... That's for the advance system, so it can always compensate, it'll just drain the pump housing but you wouldn't know as there's still fuel in the housing for it to inject...