July 15, 2021 at 5:14 am #14340
So my daughter returned from UNI and mentioned that her Fiat 500 Diesel Multijet sometimes blows white smoke whilst driving or at start up (maybe).
So I thought I would create a log of what I do to see what the issues might be .
White Smoke usually means either unburnt fuel or a water issue
Grey smoke is a little more interesting
Black Smoke usually means to much fuel being burnt (rich mixture)or Air flow restriction
Blue Smoke means the engine is burning oil.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 15, 2021 at 5:21 am #14341
So I have checked the Water level and that is as it should be, I have also checked the Oil level and that is a little over the max level which I over filled from previous top up last year.
Now to check the dashboard for any warning lights and double check Smoke is actually white and not Grey which could mean a little oil is leaking (overflowing) into fuel delivery system causing issues maybe for the diesel particulate filter (DPF) / catalytic converter being blocking or the Lambda Sensor or simular needing a clean etc.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 15, 2021 at 12:03 pm #14343GrisuParticipant
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FIAT: Failed Italian Automotive Technology or Fix It Again TonyJuly 15, 2021 at 12:07 pm #14344
FIAT: Failed Italian Automotive Technology or Fix It Again Tony
har har but back to getting the FIAT 500 working as it was intended. (Fixed It And Tested)
In a completely sane world, madness is the only freedom (J.G.Ballard).July 16, 2021 at 6:40 pm #14357
So the Fiat 500 had no warning lights on the dashboard and no visible exhaust smoke (white or black) was observed when the car cold starts in the morning and drives away .
Will test again after it rains overnight as water condensation or the known water leak from the wiper blades grill could be dripping water onto the air filter housing and maybe making the air filter damp and causing white smoke.
But good news that no water or oil is finding its way into the cylinder block over night .
Time to dig out my ODB11 Fault code reader and see if that gives any clues ?
- This reply was modified 1 week ago by UK Sentinel.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 19, 2021 at 8:43 pm #14394
Still waiting for that rainy day / night – trust us to be in the middle of a heatwave.
The Fiat 500’s Diesel Particulate Filter (DPF) dashboard warning light came on today, but alas came on as my daughter arrived home,
So good news the DPF seems to indicate it needs a clean / regeneration (a proper good run) and hopefully this could be the main reason for white smoke appearing from time to time as a DPF as part of the cleaning process uses extra fuel to help burn of soot deposits (ash) in the DPF as part of the self clean process, I am slowly drawing to the conclusion that the regens are never allowed to finish.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 20, 2021 at 7:33 am #14402
Well this morning the Fiat 500 Diesel Particulate Filter (DPF) warning light came on, the car cold started and white smoke came out from the exhaust, so seems that Fiat DPF was not allowed to finish its regeneration cycle yesterday, it decided to keep pumping in the extra fuel this morning even when the engine and exhaust is still cold which is not good.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 20, 2021 at 9:22 am #14403GrisuParticipant
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But cleaning (burning/regeneration) is done only when the engine is warm (>60°C) and must not start while still cold.
You should bring it to repair, quite sure some sensor gives wrong messurements or something like this.July 20, 2021 at 10:07 am #14406
Totally agree, regens should only occur when engine and exhaust are upto temperature, hopefully the DPF needs a good run to clear out the soot etc. Otherwise remove the DPF from car and cleaned. I plan to plug in my ODB11 Fault code reader this week to see if indeed any faults (sensors – injectors ) are identified also.
(it is a Fiat) but does look good
For anybody else reading this thread, – If you ever have the message ‘antipollution filter clogged‘ this means that the DPF Regeneration process has been interrupted 3 times before it has completed its cycle (engine turned off) and usually a 20 minute drive on the motorway at high revs will allow a DPF regen to be fully completed.
- This reply was modified 4 days ago by UK Sentinel.
In a completely sane world, madness is the only freedom (J.G.Ballard).July 24, 2021 at 8:54 am #14473
So I plugged in my Autel 519 OBD2 Reader this morning and no fault (Permanent) codes where identified, the Autel 519 did identify DPF had a flow restriction problem and an Fiat Specific code was also show $80 which after Googling seems to relate to EGR valve .
The DPF warning light is still showing so looking most lightly a DPF / Regen / Clean DPF issue.
Time to order a bottle of STP (Diesel Particulate Filter Cleaner) and a Spray can of Wynns Diesel EGR and Air Intake Cleaner, to see if a good run and spraying the Air intake hose (beyond the air filter) will bring the Fiat back to a normal running condition
In a completely sane world, madness is the only freedom (J.G.Ballard).
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