Starts then dies after 10 seconds

samc88 · Jan 10, 2015

Went to start the 88" this morning, glow plugs on for about 30 seconds. Cranked over fine and fired after a few cranks. But a slight amount of rev on it as its cold (what i always do) to clear the small amount of smoke at the back on start up and after 10 seconds it dies.

I've noticed it seems to be making a bit more smoke when cold at start up. I dont know if this is due to the cold weather or something else amiss. Its white which points to excess diesel. It clears once the engine gets going though.

Any ideas?

Engine is a 2.5 N/a

Blackburn · Jan 10, 2015

Designed to give extra fuel at start should not press accelerator to start.
Extra fuel gives smoke.
Does it restart again straight away.

samc88 · Jan 10, 2015

Blackburn said:
Designed to give extra fuel at start should not press accelerator to start.
Extra fuel gives smoke.
Does it restart again straight away.

I know that, I dont normally press it to start but sometimes it seems happier starting if you do, once it fires I press it to ensure it catches and keeps running smoothly. If I dont it tends to run a little lumpy till it warms a bit.

Starts again after cranking a while (like a car once its stalled). It starts, then the revs come up a little and it just dies. Its odd as it was starting perfectly fine yesterday

ronsealdeath · Jan 10, 2015

Air leak in fuel system somewhere? Try checking all connections and hoses.

samc88 · Jan 10, 2015

I fitted a new filter last week so will start there and work my round in the morning. Cheers for the input guys

samc88 · Jan 11, 2015

Nipped up all unions and hose clips and runs a little longer but will up the revs slightly on its own and will die so still getting air in. Lift pump works well as when operated by hand it gives a good jet of diesel and theres plenty of fuel in the tank.

Next task is to check the filter seals

trax · Jan 11, 2015

presume you aren't running veg and have a recentish tank of diesel?

oh, and that your glow plugs actually work.

samc88 · Jan 11, 2015

Yeah trax, its running diesel, put fresh stuff in last week and the tanks all clean inside and new fuel hoses all round. Its only started after fitting a new filter last week and parking with it facing uphill has highlighted the problem I think

I think they work. Takes forever cranking it over if I dont put them on for 30 secs or so

trax · Jan 11, 2015

might be worth having a look at your lift pump.

my engine was worn and low on compression, it took aaaaaaages to start in the cold.

i wouldn't be surprised about a bit of unburnt fuel on cold starting, it won't be warmed up yet for a fuller burn.

park facing down the hill from now on

Turboman · Jan 11, 2015

samc88 said:
I know that, I dont normally press it to start but sometimes it seems happier starting if you do, once it fires I press it to ensure it catches and keeps running smoothly. If I dont it tends to run a little lumpy till it warms a bit.

Starts again after cranking a while (like a car once its stalled). It starts, then the revs come up a little and it just dies. Its odd as it was starting perfectly fine yesterday

Best practice starting would be to start up without touching the pedal, and then just leave it idling while it warms up a little. Maybe as much as a few minutes if it is very cold.

I don't quite understand your post. After it dies, will it restart and run ok?

If so, I would think that you are just getting very poor fuel atomisation in cold swirl chambers, and it needs another start to warm them up. 30 seconds is a long wait for glows as well.

samc88 · Jan 11, 2015

Lift pump seems fine, when fitting the filter I operated the pump manually to check it and got a good strong jet of diesel coming out. It could just be something simple like a seal not seated properly. Well I'm hoping its something simple anyway

Engines been rebuilt and hasnt finished running in yet so everythings still tight in the engine. Usually takes 3 or 4 cranks after glowplugs to fire and first time once hot

samc88 · Jan 11, 2015

Turboman said:
Best practice starting would be to start up without touching the pedal, and then just leave it idling while it warms up a little. Maybe as much as a few minutes if it is very cold.

I don't quite understand your post. After it dies, will it restart and run ok?

If so, I would think that you are just getting very poor fuel atomisation in cold swirl chambers, and it needs another start to warm them up. 30 seconds is a long wait for glows as well.

I only use them that long when its cold. I know a few people with the same engine who do it for 30 secs or so, seems quite common. It also seems a bit happier on a faster idle when cold, it also stops everything rattling around inside as its smoother running

Once it dies it will restart and then die again 10 seconds later.

Turboman · Jan 11, 2015

samc88 said:
Lift pump seems fine, when fitting the filter I operated the pump manually to check it and got a good strong jet of diesel coming out. It could just be something simple like a seal not seated properly. Well I'm hoping its something simple anyway

Engines been rebuilt and hasnt finished running in yet so everythings still tight in the engine. Usually takes 3 or 4 cranks after glowplugs to fire and first time once hot

If a seal hasn't seated, most times will be diesel ****ing out

trax · Jan 11, 2015

if you can be bothered, you could always temp fit clear fuel pipe to look for bubbles

samc88 · Jan 11, 2015

Turboman said:
If a seal hasn't seated, most times will be diesel ****ing out

Its strange cause theres no leaks thats whats bugging me. Its going to be something simple staring me in the face. Im just going to go back and look at what I disturbed as thats where I think the problem lies

trax · Jan 11, 2015

samc88 said:
I only use them that long when its cold. I know a few people with the same engine who do it for 30 secs or so, seems quite common. It also seems a bit happier on a faster idle when cold, it also stops everything rattling around inside as its smoother running

Once it dies it will restart and then die again 10 seconds later.

the glows aren't like modern ones, they run shy of 4v iirc.. assuming you are running pigtails

also el cheapo none branded seem to be a bit crappy

Turboman · Jan 11, 2015

samc88 said:
I only use them that long when its cold. I know a few people with the same engine who do it for 30 secs or so, seems quite common. It also seems a bit happier on a faster idle when cold, it also stops everything rattling around inside as its smoother running

Once it dies it will restart and then die again 10 seconds later.

So the vehicle doesn't drive at all, only ever runs for 10 secs?

samc88 · Jan 11, 2015

Turboman said:
So the vehicle doesn't drive at all, only ever runs for 10 secs?

Yup just stalls in neutral no matter what. Its getting fuel through as you can see the smoke from the excess diesel coming out the exhaust as its cranking over. It does seem like air getting in somewhere from how it runs.

Turboman · Jan 11, 2015

Take it yu haven't left a rag in the air intake?

Got to be fuel system leak, or blockage, or maybe the lift pump doesn't perform so well under pressure as when tested.

Is it your first start since the rebuild, if so, are yu sure the pump timing is ok?

samc88 · Jan 11, 2015

No, cleaned the air intake last week (rinsing the mesh in white spirit and blown through) as well and checked hose, all good.

Its been running fine all week since swapping filter until today and done about 250 miles since rebuild. Pump timing with the belt is spot on, it seems to be right where it bolts to the timing case too.

Starts then dies after 10 seconds

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