Technical Doblo 10/2011 1.6 with 90 hp is only running 90 km/h

[rastapopoulos]

Hi,

I‘m new in the group - I want to buy a Doblo from end of 2011 with 1.6 Diesel engine with 90 hp - the owner has had the car at the workshop - it has a new Turbo and some related sensors, but it runs only 90 km/h - the error code says the Diesel particle filter is blocked - the engine runs smooth but will not arrive the max. speed - what do you think? It has run 177000 km - if I could fix it it would be a bargain. Thanks for your support.

Best regards, Stefan

 

[varesecrazy]

What % does the Diagnostic show,

Are you 100% sure that the servicing resets have been completed correctly

 

[Zardo]

Hi,

I‘m new in the group - I want to buy a Doblo from end of 2011 with 1.6 Diesel engine with 90 hp - the owner has had the car at the workshop - it has a new Turbo and some related sensors, but it runs only 90 km/h - the error code says the Diesel particle filter is blocked - the engine runs smooth but will not arrive the max. speed - what do you think? It has run 177000 km - if I could fix it it would be a bargain. Thanks for your support.

Best regards, Stefan

Does the car actually produce black exhaust fumes?

A blocked DPF will increase differential pressure (pressure builds up upstream of the DPF) and this will trigger a fault which will trigger the ECU to limit the available power. It basically goes into limp mode. It also may try to burn the accumulated particles by injecting additional fuel (supposed the exhaust is hot) but if the problem persists, more diagnostics are needed.

Assuming the DPF is indeed blocked, this could point to a lot of underlying issues.

1. The owner did change his driving behaviour and lastly did only short runs with a mostly cold engine - ask the owner
2. The car was used for heavy duty and the filter is indeed prematurely blocked because of this use generating more particles (expected lifetime would be 250 000 km with normal use) - ask the owner
3. There was or still is a technical problem with the car which may or may not affect combustion

Possible scenarios for point 3:

• Problem with the air flow meter
• Problem with injection
• Problem with increased blow-by (leads to burning more oil, negatively impacting the DPF)
• Oil leakage
• Turbo problem - not reaching its rated pressure; leaks oil into the compressor circuit, or formely leaked oil still present in the intake circuit which has not been properly cleaned
• Faulty thermostat (incorrect temperature)
• Excessive engine oil level
• EGR valve problems
• Water in the DPF
• Faulty differential pressure sensor

If underlying problems are present and aren't solved, replacing the DPF may not adress the issue completely and the new DPF might get prematurely blocked.

 

[rastapopoulos]

Does the car actually produce black exhaust fumes?

A blocked DPF will increase differential pressure (pressure builds up upstream of the DPF) and this will trigger a fault which will trigger the ECU to limit the available power. It basically goes into limp mode. It also may try to burn the accumulated particles by injecting additional fuel (supposed the exhaust is hot) but if the problem persists, more diagnostics are needed.

Assuming the DPF is indeed blocked, this could point to a lot of underlying issues.

1. The owner did change his driving behaviour and lastly did only short runs with a mostly cold engine - ask the owner
2. The car was used for heavy duty and the filter is indeed prematurely blocked because of this use generating more particles (expected lifetime would be 250 000 km with normal use) - ask the owner
3. There was or still is a technical problem with the car which may or may not affect combustion

Possible scenarios for point 3:

• Problem with the air flow meter
• Problem with injection
• Problem with increased blow-by (leads to burning more oil, negatively impacting the DPF)
• Oil leakage
• Turbo problem - not reaching its rated pressure; leaks oil into the compressor circuit, or formely leaked oil still present in the intake circuit which has not been properly cleaned
• Faulty thermostat (incorrect temperature)
• Excessive engine oil level
• EGR valve problems
• Water in the DPF
• Faulty differential pressure sensor

If underlying problems are present and aren't solved, replacing the DPF may not adress the issue completely and the new DPF might get prematurely blocked.

Hi, and thanks for your reply and the advice - the owner has changed the Turbo allready and all related sensors - the Doblo hasn‘t been abused, it wouldn‘t be in this well-kept condition - I just asked the owner about black exhaust fumes and about the oil level - and I ask for service history, because he announced that the Doblo is fully serviced - the offer is 2700€ - Doblo is from October 2011, 1,6 with 95 hp, 177000 km

Thanks again

 

[Zardo]

Poor man's unsafe way to clean a clogged DPF



add safety googles, chemical-grade protective gloves and don't play around with it that much

In the late 80s, as a 16 year old kid, I cleaned the exhaust of my two stroke 80 cm3 motorcycle using around 200 grams of 99% pure sodium hydroxide pellets (the essential ingredient in drain cleaner) I got from a pharmacy (at the time, you could get that kind of stuff) and 1.5 l of tap water, this stuff heats up so much, it will boil, that's why the pellets were added slowly over 15 minutes. The solution is, of course, extremely caustic and receiving a splash in the face might make you go blind, like permanently. I poured it all in after plugging the other end with some cork, gave it a shake, left it over night, shook it vigourously for 15 min the next day and out came numerous black chips of oily deposits. Rinsed it with water and back it went on the bike.

The professionnal way:

 

[clayts450]

You ideally need to get some diagnostics on it - if you have a half decent bluetooth OBD and you're on an Android phone, this free app is very useful indeed - worth paying for it

https://play.google.com/store/apps/details?id=com.kapron.ap.dpfmonitor&hl=en_GB

The key is finding out what is actually causing the issue - a blocked DPF is a symptom of something going wrong, not a cause.

If the van is shown as over 100% blocked, my advice is drive it around until it's at normal operating temperature, clear the codes, the van should then regenerate itself. I have experienced this twice now - see my topic at https://www.fiatforum.com/threads/2...dpf-related-shenanigans-1-3-multijet2.513342/ You're then left with the task of finding out why it is blocking.

Admittedly mine is a 1.3 95hp rather than a 1.6, but the theory remains the same.