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1.6 TDCi P0299 code. Were to look before stripping turbo and pipes?


Rich237
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3 hours ago, Finneagle64 said:

Would the actuator not working quite right cause my boost pressure to be low at high rpm and speed though? Because my car is completely fine until i get to around 70-90mph

Have you checked you are still getting the same P0299 error code? There are also error codes for boost pressure too high, or lots of other things.

If it is still saying underboost, then it could be that the expectations of the ECU are changing as rpm rises. 70mph is only a bit over 2000rpm in 5th, so below this it may be normal for boost pressure to be below max. Then as the exhaust gas flow rises, the ECU expects a rise in boost pressure. If the actuator is sticking, or the MAP is mis-reading, then it may not be seeing this rise.

If you have Forscan, it can log realtime boost pressure, rpm, and I think actuator duty cycle. It will also show just when an error is flagged, so could pin down the event a bit.

Without diagnostics, a fault like this is really only tested by changing bits until you find a bit that cures it. There is always the worry that one of the bits changed may be faulty or wrong, and confuses the situation even more!

 

 

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On 3/16/2019 at 4:25 PM, Tdci-Peter said:

Have you checked you are still getting the same P0299 error code? There are also error codes for boost pressure too high, or lots of other things.

If it is still saying underboost, then it could be that the expectations of the ECU are changing as rpm rises. 70mph is only a bit over 2000rpm in 5th, so below this it may be normal for boost pressure to be below max. Then as the exhaust gas flow rises, the ECU expects a rise in boost pressure. If the actuator is sticking, or the MAP is mis-reading, then it may not be seeing this rise.

If you have Forscan, it can log realtime boost pressure, rpm, and I think actuator duty cycle. It will also show just when an error is flagged, so could pin down the event a bit.

Without diagnostics, a fault like this is really only tested by changing bits until you find a bit that cures it. There is always the worry that one of the bits changed may be faulty or wrong, and confuses the situation even more!

 

 

Just bought myself a bluetooth obd reader to check the engine code so i will see what it says. 

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On 3/17/2019 at 8:03 PM, Finneagle64 said:

Just bought myself a bluetooth obd reader to check the engine code so i will see what it says. 

It is still underboost p0299.

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On 3/16/2019 at 12:28 PM, Finneagle64 said:

my car is completely fine until i get to around 70-90mph (it sometimes differs) and then it will just go into limp mode and i have to stop completely and turn the car off for it to reset

P0299 is an irritating one, it took me ages to find the cause on my car, mainly because out of blind foolishness I overlooked the most obvious cause, even though it was staring me in the face. The little hose that seems to have caused it is right at the top of the engine on the 1.8! I was so sure I had looked at it that I ignored it.

P0299 just means pressure reading from the MAP is too low. It could even be a blocked air filter, that would stack up with it happening only at high rpm & power.

If the car pulls well at lower rpm, then it seems the turbo is spooling up ok. If I recall, on the 1.6 the turbo actuator rests in the max boost position, and it needs vacuum on the actuator to move it to the no boost position for idling. So it should cycle when the ignition is turned on, or when the engine starts. That is one test of the actuator & vacuum system.

Blockages anywhere in the air intake system, including intercooler, throttle valve, inlet manifold, valve passages etc, could all cause pressure drop at high airflow. So could blockages in the exhaust, like DPF or cat. The DPF pressure drop is monitored, but if your DPF system is not working or disabled, like a broken hose to the DPF DP sensor, then that could do it.

The MAP sensor on the 1.6 is near the throttle valve & dipstick, see:

 

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On 3/19/2019 at 8:03 PM, Tdci-Peter said:

P0299 is an irritating one, it took me ages to find the cause on my car, mainly because out of blind foolishness I overlooked the most obvious cause, even though it was staring me in the face. The little hose that seems to have caused it is right at the top of the engine on the 1.8! I was so sure I had looked at it that I ignored it.

P0299 just means pressure reading from the MAP is too low. It could even be a blocked air filter, that would stack up with it happening only at high rpm & power.

If the car pulls well at lower rpm, then it seems the turbo is spooling up ok. If I recall, on the 1.6 the turbo actuator rests in the max boost position, and it needs vacuum on the actuator to move it to the no boost position for idling. So it should cycle when the ignition is turned on, or when the engine starts. That is one test of the actuator & vacuum system.

Blockages anywhere in the air intake system, including intercooler, throttle valve, inlet manifold, valve passages etc, could all cause pressure drop at high airflow. So could blockages in the exhaust, like DPF or cat. The DPF pressure drop is monitored, but if your DPF system is not working or disabled, like a broken hose to the DPF DP sensor, then that could do it.

The MAP sensor on the 1.6 is near the throttle valve & dipstick, see:

 

The actuator does move slightly, when the car is off the actuator pushes out and then when the engine is on it sucks the rod coming out of it in. So im guessing it works... to some extent. Might replace it anyway and hope that jt sorts it. It makes horrible creaking noises if i push and pull it so thinking its just old and knackered

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  • 1 year later...
On 2/22/2017 at 11:11 PM, Tdci-Peter said:

I can't see very well what is happening, those graph lines are a bit hard to identify on my screen.

But I can see the MAP (2nd from top?) dropping off as rpm (top line?) rises.

But why is hard to see. It could be blockage in the intake (throttle valve, air filter), leaks (split hose), or be the turbo actuator, or turbo. Turbo seems less likely as this evidently works mostly, and it is a very simple mechanical unit.

Actuator has a position feedback sensor & a control valve (I assume it is the vacuum actuator, not the electric actuator). So scope for odd failures there.

The MAP sensor does show a few odd wiggles for no apparent reason, maybe the MAP or its wiring is at fault.

Sorry, I can't help much more than that, but I will watch this thread for any more info or ideas!

 

 

 

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Hi 

iv got a similar problem on my ford transit courier 1.6tdci and Iv had a ford specialist look at it and what he said was the map sensor readings drop intermittently into negative pressure ( below atmospheric pressure) and because the map sensor is new,he’s only seen it once before and it turned out to be the timing belt had slipped !  As it’s the only way the engine could possibly read less pressure than sea level ??? 

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4 hours ago, Richyonekit said:

Iv had a ford specialist look at it and what he said was the map sensor readings drop intermittently into negative pressure ( below atmospheric pressure) and because the map sensor is new,he’s only seen it once before and it turned out to be the timing belt had slipped !  As it’s the only way the engine could possibly read less pressure than sea level ??? 

My immediate reaction is: Rubbish!

If the cam timing had slipped enough to make any big difference to the inlet and exhaust strokes, the valves would have hit the pistons big time - wrecked engine. There is very little clearance on these high compression Diesels.

In normal running (no intake throttle), the inlet manifold should be almost open to the atmosphere, only the air filter can lower the pressure. The Turbo compressor can raise the pressure if spinning, but can not practically reduce the pressure.

On the 1.6TDCI, the one thing that will really lower the pressure is the intake throttle valve. And it is quite normal for this to operate at times, in conjunction with the EGR, to reduce manifold pressure below atmospheric. Or it could be operating abnormally and blocking the intake when it should not. A faulty sensor in the intake throttle could do this, making the ECU close the valve too much because the sensor say it is still wide open, for example.

There is almost no redundancy (two readings saying the same thing) on Ford engines, so it can be very hard to pin point a fault, is it an actuator or a sensor, or another sensor? Forscan can, I think, display the Intake throttle PWM (actuator drive %) and the position (sensor reading), and the MAP etc.

In short, if you are seeing MAP readings below 1 bar, and the MAP sensor is confirmed as ok (along with its wiring and connections!), then the intake throttle is prime suspect. But pressures below 1Bar are normal, at certain times when the EGR is in use, or during dpf regens, on the 1.6TDCI. I have seen graphs of this, but would have to do a lot of digging to find them again!

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  • 2 months later...

Hi thanks for your reply 

When you say intake throttle do you mean the throttle body after the intercooler ? If so Iv changed this and no improvement? Sorry I’m not that technical 🙈

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4 hours ago, Richyonekit said:

When you say intake throttle do you mean the throttle body after the intercooler ? If so Iv changed this and no improvement?

Yes, it is the valve in the duct from intercooler to the intake manifold. I don't know how much negative pressure is being seen, when or how often, so it is very hard to say what the cause could be. But if the pressure drop is significant, it almost has to be due to this valve part closing. There are at least three reasons for the ECU to operate this valve: To help achieve the desired EGR flow, to help get the high exhaust temperature needed for DPF regen, and when the engine stops, as an anti-shudder feature. In addition, wiring problems and bad connections could make it close. Bad connections could also make the MAP read wrongly, even if the sensor has been replaced.

Several of the engine sensors and valves are also involved in all this, so just changing parts could be a long and expensive process. It may need expert diagnosis.

But the idea that a little shift in the valve timing could generate large dips below atmospheric in the inlet manifold (without this valve closing) sounds absurd to me.

Some sort of significant obstruction of the air intake path is needed to reduce the pressure. I doubt if the air filter, intercooler bypass valve (if fitted), or intercooler itself can do this intermittently. Could it be something like a flap of rubber moving about inside the ducts? Improbable. That just leaves the throttle valve being operated unexpectedly, or a faulty MAP reading at the ECU end of its wiring.

 

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  • 5 months later...

I had similar issue and would only happen in the summer, cleaned the MAF sensor with isopropanol and never had that fault code again!

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  • 3 months later...

I have a 1.6tdci 2009 Ford Fiesta on 135k miles for the past month I’ve been trying to fix it due to a P0299 code coming up I’ve changed almost everything you can think of, EGR valve, turbo, map sensor and the pressure converter down the back of the engine block. I’m still having no luck with it and the P0299 code is still on the dash. 
I find that when it goes into limp mode it won’t Rev past 4000rpm and goes into limp mode when trying to pull away from 30mph in 4th gear, hills also do not help the situation.

im running out of things to suggest if anyone can help it would be much appreciated. 

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1 hour ago, Jp240 said:

goes into limp mode when trying to pull away from 30mph in 4th gear, hills also do not help

30mph in 4th is rather low rpm in these Diesels. If going up more than a modest hill, or if wanting to accelerate, I drop down to 3rd. It saves "lugging" the engine, with likely wear on the DMF if nothing else. I would try to investigate the rpm vs throttle opening range that the engine was happy with, and be careful to stay in that range. In my car, about 1750rpm is the lowest I will use wide throttle openings. I think the 1.6 has a similar gearing ratio.

That said, it should not be putting up an error code. My car did this regularly, with  P0299 DTC, due to just a little too much throttle at low rpm. This turned out to be a major crack (almost a total break by the time I found it!) in the hose to the MAP sensor. The 1.6 does not have this little hose, the MAP goes direct in the air duct. But I assume you have carefully checked all air & vacuum hoses & fittings.

If it is not any of the hoses, Turbo actuator parts (inc vacuum pump, solenoid & hoses), Turbo, MAP sensor or MAF sensor, then I would suspect coking up of the airways in the inlet manifold and cylinder head. Restricted air flow on the inlet will result in less flow in the exhaust, which will be incapable of spinning the turbo up fully at low rpm, with low MAP reading, resulting in P0299.

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  • 2 weeks later...

Hi. Hope you dont think I'm speaking out of turn ! I have a simple ford focus 1l eco boost . I had been having the same issues of it going into limp mode when going on motorway for a while , seemed fine in and around town. Just recently there was barely any power with foot flat on the floor and would only just make it up a hill.  On diagnostic the p0299 code come up. It's just been in ford garage and had an extensive inspection done on it. The only thing they have found wrong is faulty spark plugs!! Of course I'm not suggesting this is everybody's problem but if it helps just one of you it will be great! 

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  • 6 months later...

Hi, my Ford fiesta 2009 model (90bhp) suddenly stopped and after 2 month i got someone to start it and they said the ecu system was currupt. The warning was (steering malfunction service now.  

 

Everything after that went smoooth other than when i drove over 100-120km the engine loose power as before but was okay after i started the car again. 

 

Recently again i have engine light and «engine malfunction service now. I cleansed egr valve to see if anything would get better but after i’ve done that i still got the warning lights and now the car goes very slowly when trying to drive, i can feel that the car dosen’t pull like before. Does anyone know wheter is the ecu or electronics that are failing or is some parts i need to change? I’ve done a diagnostic check and will leave the fault codes if anyone can pinpoint whats the issue is? Car is drivable with all warnings.

 

P0299 turbocharger/ compressor charge pressure to low. 

 

Ud121-00 no comunication with abs modoule (brakes function normal)

 

B1B71-13 evaporate temerature sensor

 

P1632-00  sensor cirut/ error detection sensor, intelligent all.

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Hi, my Ford fiesta 2009 model (90bhp) suddenly stopped and after 2 month i got someone to start it and they said the ecu system was currupt. The warning was (steering malfunction service now.  

 

Everything after that went smoooth other than when i drove over 100-120km the engine loose power as before but was okay after i started the car again. 

 

Recently again i have engine light and «engine malfunction service now. I cleansed egr valve to see if anything would get better but after i’ve done that i still got the warning lights and now the car goes very slowly when trying to drive, i can feel that the car dosen’t pull like before. Does anyone know wheter is the ecu or electronics that are failing or is some parts i need to change? I’ve done a diagnostic check and will leave the fault codes if anyone can pinpoint whats the issue is? Car is drivable with all warnings.

 

P0299 turbocharger/ compressor charge pressure to low. 

 

Ud121-00 no comunication with abs modoule (brakes function normal)

 

B1B71-13 evaporate temerature sensor

 

P1632-00  sensor cirut/ error detection sensor, intelligent all

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9 hours ago, Hamzii said:

P0299 turbocharger/ compressor charge pressure too low. 

The P0299 code could explain lack of power. I would first check or change the MAP sensor, which is the sensor giving the low readings. Then look at and test the turbo actuator mechanism. Fuel filters, intake air filters, major air leaks in the intake system, MAF faults and various other engine faults can also prevent the full turbo boost from being achieved.

P1632 could be a wiring fault (bad connection) between alternator and ECU. The ABS comms fault is most likely to be a glitch (if it does not return) or a bad connection in the CAN bus possibly if it does return.

There is nothing there that shouts out an ECU internal problem.

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