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Ducato HELP!! Misfire and white smoke when cold

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Ducato HELP!! Misfire and white smoke when cold

J

jackma

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Hi all, Newbie here.
Can anybody help? I have a 2008 2.2 Ducato which on start up and until its warm the engine misfires and smokes (white) the smoke is un-burnt fuel no power loss once the engine starts to warm up a click can be heard like a relay and then the van runs fine. I have changed the glow plugs and cleaned the EGR valve. Any ideas?
 
Last edited:
jackma said:
Hi all, Newbie here.
Can anybody help? I have a 2008 2.2 Ducato which on start up and until its warm the engine misfires and smokes (white) the smoke is un-burnt fuel no power loss once the engine starts to warm up a click can be heard like a relay and then the van runs fine. I have changed the glow plugs and cleaned the EGR valve. Any ideas?
Click to expand...



in a compression -ignition engine , you rely on HEAT in the cylinders to ignite the fuel,


glow plugs are the obvious thing - changed


next time it does it after a few seconds give it 3/4 throttle , and see if the "missing" cylinders kick in..,


if the don't ,
or they kick-in then drop out again,


get a professional to do a compression test


the Click could be coincidental..,


Charlie
 
First locate the cable going to the throttle valve.
Then, when the engine is running OK, pull the plug from the valve, then switch off the engine and go do something else.
I bet the van will start without troubles the next time.
 
franglais said:
diesels don't have throttle valves.
Click to expand...

They shouldn't have them, but a few manufacturers - among them FIAT - install such valves to obtain better emission figures.
FIAT also uses the valve for faster engine shutdown. Not really necessary, but the idea isn't all bad, except they have the valve solenoid exposed to the waterfall under the windscreen that is an integral part of all Ducatos since 2006.
Those who do not use their vehicle every day are sooner or later faced with starting problems when the valve gets stuck in closed position.
 
CDK said:
They shouldn't have them, but a few manufacturers - among them FIAT - install such valves to obtain better emission figures.
FIAT also uses the valve for faster engine shutdown. Not really necessary, but the idea isn't all bad, except they have the valve solenoid exposed to the waterfall under the windscreen that is an integral part of all Ducatos since 2006.
Those who do not use their vehicle every day are sooner or later faced with starting problems when the valve gets stuck in closed position.
Click to expand...

curious, i have never come across that before, learn something new every day :)
are they hard linked to the accelerator or is it an actuator controlled by the ecu?
 
Fiat calls it an electric motor but it is in fact a 90 degrees rotating solenoid. The workshop manual says it is PWM controlled under certain conditions (highway, 2500-3000 rpm) but I have not been able to verify that, only that it gets 12VDC when the engine is switched off. When no more rpm pulses arrive at the ECU the power is cut and the valve is opened by a coil spring (unless there is a lot of rust in the chamber between the valve and the solenoid). There is feedback wiring to tell the ECU what happens, but FIAT does not use it.
 
Renault have one on the 2.2dci engine in my espace. AFAIK it only closes when ignition is switched OFF. it then closes the air intake so no air will pass. It is there due to ren. common rail engines running on and away after ingesting engine oil buid up / fuel build up in the intake system, had many serious engine blow ups that way; the engine feeds on its own oil and screams away till destruction, so they put this on as a safe guard- the previous ones would not shut down even after switching off, as they had access to so much oil. and crucially, AIR. Remove combustion air and you have a much better remedy. Food for thought?
 
Not common rail related I presume.
My Kia Sorento 2.5crdi has no such valve and stops without issues.
 
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