Peugeot 308 1.6hdi smoky exhaust

[SeanOB]

Hi all,

My 2008 308SW 1.6hdi is smoking (sometimes heavily) when the engine is under high load, such as going up steep hills or high accelleration. It looks like black smoke so I'm thinking that the diesel/air mix is too rich. I would like suggestions as to what might be causing it.

A bit of potentially relevant backgound. Six or so months ago, it started cutting out at random times, eventually to the point where it would cut out almost straight away and would not restart. A lot of investigation/work was done to the fuel supply, including reconditioning the injectors, replacing the fuel pump, replacing the EGR valve, the crankshaft sensor and eventually the fule pressure sensor (which worked). However, since then the engine has been smoky. I found a small split in the air intake flexible pipe feeding into the engine and rpelaced that pipe. It made matters slightly but not completely better. The DPF is now getting clogged with all the soot the engine is putting out.

I am hoping to trace and fix whatever is causing the smokiness. Your help would be greatly appreciated!

[GiveMeABreak]

It definitely sounds like an Air / Fuel mixture problem and really needs some further investigation. If you have Lexia / Diagbox or have undertaken a diagnostic, pop up any fault codes long with your VIN (automasked on post submission) for further info.

[SeanOB]

Thanks, GiveMeABreak,

The codes are P0299, P0490, P1490, P1446, P1351, P0420, P1459, P1447 annd P0402. The DFP additive system is empty (don't think it was ever refilled by earlier ownders as the bag had perished and split) and I am having that refilled this week.
VIN is VF3**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Ok, so sitting comfortably?

Here are all the fault code descriptors for you. Rather than regurgitate everything, have a read through. You'll see that the the engine ECU will apply similar downgrade modes and limit functions whilst these faults are active. Your EGR seems to be getting stuck too, as the engine ECU normally tries to clean this to help prevent sticking by opening and closing it several times, so that may be bunged up and need looking at.

Fault Code:	P0299
Description of Fault:	Turbocharger pressure signal: Pressure too low in relation to the reference value. Difference negative for 5 seconds, between the turbo pressure reference and the measured turbo pressure: The pressure measured is lower than the reference, around 300 mbars for an engine speed above 2500 rpm. Fault is triggered when: In particle filter regeneration with engine speed above 1800 rpm Not in particle filter regeneration with engine speed under 1500 rpm
Conditions for Fault to clear:	Driving for 5 min with several full load accelerations for 10 seconds
Downgrade Modes whilst Fault is active:	Use of the flow calculated Cutting of the EGR butterfly (turbo air cooler), EGR valve and bypass butterfly (inlet air heater) in all operating modes Cutting of cruise control Change to "easy move" torque invalid (Deactivation of automatic mode for the electronic parking brake)
Symptoms:	Lack of power Noise Smoke from the exhaust
Suspect Areas:	Air meter restricted Clogged air filter Obstacle obstructing the air passage Air lock between compressor and engine Turbocharging pressure sensor Turbocharger position copy sensor Vacuum problem Variable geometry of the turbocharger jammed in the "minimum turbo" position Faulty turbocharger

Fault Code:	P0490
Description of Fault:	Position indicator signal of the EGR valve: Positive loop gap. Positive difference of 30% % between the exhaust gas recirculation valve position reference value and the position measured (For 10 seconds).
Conditions for Fault to clear:	Driving for 5 minutes
Downgrade Modes whilst Fault is active:	Inhibiting of the diagnostics and air flow sensor plausibility Change to "easy move" torque invalid (Deactivation of automatic mode for the electronic parking brake)
Symptoms:	Noise Smoke from the exhaust Diesel fuel consumption a bit higher Lack of power
Suspect Areas:	Electrical harness Connector Exhaust gas recycling valve Clogged particle filter

Fault Code:	P1490
Description of Fault:	Regeneration not achieved: Regeneration request too frequent. Number of regeneration requests in downgrade mode ; (made by the ECU) : more than 2
Conditions for Fault to clear:	After a complete cycle of regeneration of the particle filter
Downgrade Modes whilst Fault is active:	-
Symptoms:	Engine hesitating, cutting out Lack of power Noise
Suspect Areas:	Pneumatic meter of the turbo air cooler by-pass Particle filter Particle filter differential pressure sensor Particle filter upstream temperature sensor Soft pouch of the additive reservoir Additive pump Additive tank Anti-return valve(Between the reservoir and the additive hose) Electrical harness Connector

Fault Code:	P1446
Description of Fault:	Particle filter additive system: Insufficient quantity of additive remaining in the reservoir. Minimal level of additive in the reservoir.
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	-
Symptoms:	-
Suspect Areas:	Additive pump Additive level Additive tank

Fault Code:	P1351
Description of Fault:	Pre-heating relay circuit: Coherence ; Relay supplied and glow plugs not supplied. The information from the preheating control unit indicates that the relay is open even though the ECU commands the closing of the relay for 2 seconds.
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:
Symptoms:	Lack of power Noise Jerking/stalling Starting problem
Suspect Areas:	Pre-heater plug Electrical harness Pre/post heating relay

Fault Code:	P0420
Description of Fault: (Curbing of the function of volume flow to the terminals of the particle filter)	Exhaust differential pressure sensor signal (Particle filter): Particle filter overloaded. Detection of an overloaded particle emission filter for 7 s 300 mbar for 200 000 l/h 600 mbar for 600 000 l/h 500 mbar for 1 000 l/h
Conditions for Fault to clear:	Driving for 5 minutes
Downgrade Modes whilst Fault is active:	Inhibiting of the diagnostics and air flow sensor plausibility
Symptoms:	Lack of power
Suspect Areas:	Pneumatic meter of the turbo air cooler by-pass Particulate emission filter (pef) Particle filter differential pressure sensor Particle filter upstream temperature sensor Electrical harness Connector Catalytic converter Rigid plastic or soft pouch additive reservoir Additive pump Anti-return valve

Fault Code:	P1459
Description of Fault:	Position indicator signal of the EGR valve: Valve jammed open while driving. EGR valve jammed shut while driving for 5 seconds. Cleaning forced by the engine ECU
Conditions for Fault to clear:	Driving for 5 minutes
Downgrade Modes whilst Fault is active:	Inhibiting of the diagnostics and air flow sensor plausibility Cutting of all the EGR valve actuators (Turbocharger air cooler); EGR valve; Bypass valve (Intake air heater ) In all operating modes Cutting of the "exhaust heat recovery" function Change to "easy move" torque invalid (Deactivation of the automatic mode of the electrically controlled parking brake)
Symptoms:	Jerking/stalling Exhaust smoke Starting problem Lack of power
Suspect Areas:	Electrical harness Connections EGR valve (Jammed closed) Engine ECU ( software)

Fault Code:	P1447
Description of Fault:	Exhaust differential pressure sensor signal (Particle filter ): Clogged particle filter Clogged particle filter Possibility 1 The difference in the particle filter pressure is greater for 7 s than 500 mbar for a volume flow to the terminals of the particle filter of 200 000 litres/hour Possibility 2 The difference in the particle filter pressure is greater for 7 s than 800 mbar for a volume flow to the terminals of the particle filter of 600 000 litres/hour Possibility 3 The difference in the particle filter pressure is greater for 7 s than 700 mbar for a volume flow to the terminals of the particle filter of 1 000 000 litres/hour
Conditions for Fault to clear:	Driving for 5 minutes
Downgrade Modes whilst Fault is active:	The ECU inhibiting of the diagnostics and air flow sensor plausibility Cutting of the "exhaust heat recovery" function Limitation of engine torque Irreversible cutting of the cruise control Prohibition/abandonment of forced regeneration of the particle filter by the aftersales diagnostic tool (incorrect torque)
Symptoms:	Engine hesitating, cutting out Lack of power Noise Starting problem
Suspect Areas:	Pneumatic by-pass meter Turbocharger air cooler (Insufficient valve performance) Clogged particle filter Particle filter differential pressure sensor Electrical harness Connector Particle filter upstream temperature sensor Soft pouch of the additive reservoir (Insufficient additive) Additive pump (Insufficient additive) Anti-return valve (Insufficient additive)

Fault Code:	P0402
Description of Fault:	Air system fault : Measured quantity of air lower than the setting. Positive gap for 10 seconds between the theoretical air flow and the calculated measured air flow. The following conditions have to be met: - Consult the associated contexts for the Pcode forwarding conditions - Engine speed between 750 and 2750 rpm
Conditions for Fault to clear:	Vehicle driven for 5 minutes, remaining below an engine speed of 3000 rpm.
Downgrade Modes whilst Fault is active:	Deactivation of diagnosis of coherence on the flowmeter Cutting of the EGR butterfly (turbo air cooler), EGR valve and bypass butterfly (inlet air heater) in all operating modes Cutting of the "exhaust heat recovery" function Limitation of engine torque Cutting of cruise control
Symptoms:	Noise Diesel fuel consumption a bit higher Lack of power Starting problem
Suspect Areas:	Exhaust gas recycling valve Air leak between the air flow sensor and the compressor Obstacle hindering the passage of the air Air flow sensor information incorrect Vacuum problem Variable geometry of the turbocharger jammed in the "minimum turbo" position Principal air meter Air flow meter turbocharger Variable geometry of the turbo + vacuum circuit Turbocharging pressure sensor Clogged air filter

[SeanOB]

Thanks for the info - that's really helpful.

Have put JLM DPF cleaner in the tank. PAT fluid tank is being replaced on Wednesday. Mikght have to have the DPF professionally cleaned. Will have the EGR valve looked at. Looks like the turbo will have to be looked at as well.

Is it worth looking at the the air temp sensor? Nothing above seemed to suggest so; however, I am worried I might have damaged it when I repared the leaking pipe between the intercooler and engine air intake (wipoing oil out too roughl!).

[GiveMeABreak]

If you mean the Air Flow Meter (MAF), then this can obviously play havoc with the Air / Fuelling as the engine ECU relies on the data to make adjustments. You can get a spray cleaner designed for MAFs, but be careful of the sensor wire, it is very sensitive and easily damaged if cleaining.

[SeanOB]

Thanks - I will probably have a look at the MAF to see if it needs cleaning. However, the sensor I am referring to is attached to the assembly that comes between the intercooler and the engine itself. There is a pressure sensor and temperature sensor just before the final flexible pipe leading into the intake manifold. It was the temperature sensor that I bashed when having a clean around. I'm not sure if that will make any difference. It's not a very expensive component and so I might just change it anyway.

[GiveMeABreak]

Ok, just get a decent branded one and not a Eurocarparts special, as they are notoriously poor and often DOA.

[SeanOB]

Will do, thanks!

[schaffi]

Hi all,

My 2008 308SW 1.6hdi is smoking (sometimes heavily) when the engine is under high load, such as going up steep hills or high accelleration. It looks like black smoke so I'm thinking that the diesel/air mix is too rich. I would like suggestions as to what might be causing it.

A bit of potentially relevant backgound. Six or so months ago, it started cutting out at random times, eventually to the point where it would cut out almost straight away and would not restart. A lot of investigation/work was done to the fuel supply, including reconditioning the injectors, replacing the fuel pump, replacing the EGR valve, the crankshaft sensor and eventually the fule pressure sensor (which worked). However, since then the engine has been smoky. I found a small split in the air intake flexible pipe feeding into the engine and rpelaced that pipe. It made matters slightly but not completely better. The DPF is now getting clogged with all the soot the engine is putting out.

I am hoping to trace and fix whatever is causing the smokiness. Your help would be greatly appreciated!

Hello!
I was wondering if the problem was finally resolved? I have the same engine and it smokes a lot when I accelerate, but the OBD shows no error code.