Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Engine mount would not be the case, as the idle speed is fluctuating by about 100rpm, you can hear it as wel. It sounds like a tuned us big block when idling......
23rd Sep 2014 7:15 am
Arif
Member Since: 05 Jul 2014
Location: Essex
Posts: 236
Hi stav my 05 D3 is doing the same. It does it only from cold start and does it intermittently until the car is up to temperature.
I suspected injectors but I'm not sure. Have you had any luck finding the cause yet?
14th Oct 2014 11:02 pm
STAR 316
Member Since: 06 Oct 2014
Location: glasgow
Posts: 26
common rail fuel pressure sensor , maybe .
15th Oct 2014 12:16 am
maplecottage
Member Since: 01 Feb 2011
Location: Norfolk
Posts: 3171
I put mine down to b*ggered Glow Plugs
15th Oct 2014 9:05 am
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
STAR 316 wrote:
common rail fuel pressure sensor , maybe .
shouldnt there be a fault code if this is the case?
15th Oct 2014 10:21 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731
Arif wrote:
Hi stav my 05 D3 is doing the same. It does it only from cold start and does it intermittently until the car is up to temperature.
I suspected injectors but I'm not sure. Have you had any luck finding the cause yet?
Member Since: 05 Jul 2014
Location: Essex
Posts: 236
Hi DM,
How much are a set of injectors? I know it isn't the glow plugs as the stealers had it for 2 months breaking and then replacing them.
I hear Citeron C5 and C6 injectors are the same?
15th Oct 2014 6:04 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731
Couple of hundred quid each...
Still trying to find the differences between EU3 + EU4 injectors. I have a set of known good, low mile injectors sat in the shed I was hoping to use. Dont want to do any permanent damage though My D3 Build Thread
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Arif wrote:
How much are a set of injectors?
Injectors do not have to be replaced as a set and given the price of them it is essential that you identify which injectors (if any) are failing and only replace those that need to be. A good technician will do a spill check where they attach bottle to the fuel return on each injector to compare the back leakage.
Excessive back leakage can exceed the ability of the fuel pump to maintain pressure. As the fuel pump pressure is proportional to the engine speed this tends to manifest itself at low rpm. If there is an injector that fills a bottle quicker than others then that injector will need to be replaced. Ideally the fill rate of each bottle will be nearly identical. The only time it is appropriate to change a set of injectors is when metal particles have been ejected by a failing fuel pump and flowed their way around the HP system.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 05 Jul 2014
Location: Essex
Posts: 236
What I don't get is why would an injector only play up until the engine gets up to temp. Surely a faulty injector should give the same symptoms no matter what the engine temp?
Forgive me for my ignorance
15th Oct 2014 6:56 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
I have the same question with Arif. Also using the IIDtool , all injector readings are withing a range of 930-1080. Would that be good?
16th Oct 2014 10:05 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Stav & Arif, you have to do a spill check. The injector values cannot be used as the sole diagnostic parameter and that is why the workshop manual calls for a spill check.
Injectors can be worse or better at cold temps depending on where the leak is. Some leaks get worse as the fuel warms and the viscosity lowers, others get better when things warm-up due to metal expansion.
Another significant factor is the demand for fuel vs rpm. When a diesel engine is cold it requires a lot more fuel but with a low rpm the fuel pump may not cope if there is a leak. When warm the fuel demand is less and at higher rpm the ability of the pump to maintain pressure also increased.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Mine does it only for 2-3 mins from cold, then everything is ok. Sometimes i start and idle is perfect when cold, then idle goes bad during warm up, i.e when engine temp goes from lets say 40 to 60 degrees, then when fully warmed at 80-90 degrees, its ok. Thats why its confusing.
i was wondering if its something electrical causing it.....even the air compressor
16th Oct 2014 1:05 pm
Arif
Member Since: 05 Jul 2014
Location: Essex
Posts: 236
Thanks Robbie will definitely be doing a spill check, although it doesn't seem to have done it since Geoff blanked the EGR's.
17th Oct 2014 3:51 am
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Still investigating.....just noticed that when engine is cold and idle is misfiring, fuel pressure reading is 26000kpa. When engine warms up and idle becomes perfect, the fuel pressure reading drops to 22000kpa. Would that be normal???
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