Lumpy upon start up

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KernowSam

KernowSam

New Member
Posts
221
Location
St Ives, Cornwall
Just drove home from the gf's. Noticed it was a bit lumpy on start up. Then pulling off at about 1500 rpm the engine seems to be lumpy. You reckon this is a sticky injector or low pressure fuel pump related?
 
could be either but try chucking some cleaner direct into the injector first (think saint V8 or someone had a thread on how to do this recently)
 
dolphinboy said:
could be either but try chucking some cleaner direct into the injector first (think saint V8 or someone had a thread on how to do this recently)
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Wasn't me!!

But I do recall a thread or post quite recently about Injector Cleaner....something like opening the filter, drain the diesel and pour in as much injector cleaner as you can then close up and pour the rest into the tank....

Not sure on its effectiveness.....
 
If you want a cheaper version of injector cleaner that also helps in cold weather, add petrol. It'll clean the injectors nicely, as the engine in the early L322s is still quite an unrefined derv you can get away with a healthy amount of petrol without doing damage. A more highly strung newer engine will throw it's toys out of the pram. You could probably get away with 6-8 litres without drama.

I know a lot of guys who run with a small amount of petrol at all times. But once a year always seems sufficient for me. If the injectors are clogging fast enough that you need to clean more often, you've got bigger problems. One could argue you should never need to use injector cleaner if you drive a derv correctly. The clogging is usually caused by stop/start traffic. Get it on the open road and blast them clear.
 
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good advice thanks for that. I will try a little petrol in with a full tank and see. Just drove it a minute ago, seems like the uneven revs go away when warm I expect it is a sticky injector. However, what are the symptoms of the low pressure fuel pump dieing?
 
Bix said:
If you want a cheaper version of injector cleaner that also helps in cold weather, add petrol. It'll clean the injectors nicely, as the engine in the early L322s is still quite an unrefined derv you can get away with a healthy amount of petrol without doing damage. A more highly strung newer engine will throw it's toys out of the pram. You could probably get away with 6-8 litres without drama.

I know a lot of guys who run with a small amount of petrol at all times. But once a year always seems sufficient for me. If the injectors are clogging fast enough that you need to clean more often, you've got bigger problems. One could argue you should never need to use injector cleaner if you drive a derv correctly. The clogging is usually caused by stop/start traffic. Get it on the open road and blast them clear.
Click to expand...
The M57 is a common rail high pressure direct injection engine, basically the same as any other "modern" diesel.
 
Datatek said:
The M57 is a common rail high pressure direct injection engine, basically the same as any other "modern" diesel.
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The tolerances are a lot finer on new engines though, I'm not sure how well they'd handle the thinned lubrication by adding petrol. The M57 is still quite agricultural in design.
 
Put a fivers worth of petrol in with £50 of diesel- couple of runs later she seems a lot better- still a bit lumpy on start up but much better. Will see whether it improves further.
Out of interest- Can anyone explain to me what the pre-heater does? Is this some kind of Webasto type diesel heater under the car- what purpose does it fulfill? Sorry to be silly!
 
bluebeasty said:
Put a fivers worth of petrol in with £50 of diesel- couple of runs later she seems a lot better- still a bit lumpy on start up but much better. Will see whether it improves further.
Out of interest- Can anyone explain to me what the pre-heater does? Is this some kind of Webasto type diesel heater under the car- what purpose does it fulfill? Sorry to be silly!
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the webasto pre heater unit starts when you turn on the engine when temps are below 7 degrees (i think)

they can also be turned on manually using the satnav screen or remotely from inside your house using a fob so you can return to a warm and defrosted car, without even starting the engine !! :p

main reason for them is to help get the engine up to running temps quickly, which will aid fuel consumption and obviously will get your cabin warmer much quicker than without one.

as the m57 engine in the TD6's give off very little heat, so no good for winter lol
 
so what does it actually do- does it heat the internals of the engine or the fuel system? Or does it give the cabin ventilation a head start on warming the inside?
 
bluebeasty said:
so what does it actually do- does it heat the internals of the engine or the fuel system? Or does it give the cabin ventilation a head start on warming the inside?
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heats internal engine. Ie, heats the coolant which in turn heats the engine block.

and at the same time heats up your cabin nice and toasty.

without one or if yours stops working you will know as it will take at least 15-20 mins to get any hot air out
 
bluebeasty said:
And does it start from unlocking the car or turning the key? Can it be configured to start on the button- would be bloody handy atm!
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nope, only starts up when you turn on ignition and start the engine.

or like i said, from the webasto remote fob (if you have one), set a timer from the dash screen), or just manual turn on from the screen

:D
 
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