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Frequently Asked Questions
Is it safe to run a remap on my car?
Yes, at HDI tuning we spend a lot of time developing and testing our remaps to ensure they will not cause any damage to your engine or turbo charger. You should however be sure to stick to the service intervals, it doesn't hurt to half the intervals to ensure your turbo is supplied with nice clean oil.
Generally it is recommend that you carry out a full service prior to carrying out a remap unless it has occurred recently. Be sure to use good quality fully synthetic oil of the correct grade for your engine. When changing the fuel filter be sure to prime the system prior to starting the engine to prevent air locks.
My car has running problems, should I still go ahead with a remap?
No, you should always fix any problems prior to tuning an engine. If more power is to be requested from it then it's important it's in tip top condition. If you have a fault that you can't figure out please don't hesitate to get in touch for advice.
Can I set my car back to standard after it has been remapped?
Yes, reprogramming the ECU back to its standard settings is exactly the same as programming the remapped file. You need to save your original ECU data file somewhere it won’t get lost, or contact us if you can’t get hold of it.
Is it worth disabling the EGR if there aren’t any problems with it currently?
This is entirely up to you, however it’s likely the electrovalve will go wrong at some point in your car’s life and cause an EGR fault, so you may as well remove it as a preventative measure. You’ll also notice better pick up and slightly better fuel economy with the EGR removed. If you want two files, one with and one without EGR please request this when we are making your remap.
Will my car pass the particle emissions test at MOT?
Yes you will pass with no problems, particle emissions should not alter significantly under the non-loaded condition at which an MOT test is carried out (assuming your engine is running correctly).
Can you delete the MAF from my ECU software?
We don't delete the MAF via the file service, the MAF is very important. Here's a quick explanation of why MAF delete is bad:
- MAF - Fuel economy: The MAF has both an air mass meter and an intake temperature sensor.
The ECU makes small injection timing corrections based on the intake air temperature and the air mass flow.
These result in both better fuel economy and also a smoother sounding engine.
- MAF - AFR calculation and smoke limitation: The main job of the MAF is to monitor how much air is available to enable the ECU to precisely control the fuel quantity injected in to the engine.
If a MAF is deleted, we need to set some default high values so that power is not limited. This results in lots of smoke under full load as the car no longer controls Air Fuel Ratio (AFR), once the turbo spools up then there will be sufficient air and the car will run cleanly.
- MAF - Fault finding: The ECU is actually constantly analysing the air flow entering your engine, if it goes out of specified limits then it will flag an error to let you know.
There are two faults which can be detected by an air mass meter:
- MAF - EGR fault: The ECU can detect if the EGR is jammed open, this is clear from a reduced flow of fresh air in to your engine, this will give lots of smoke and severely limit power. The ECU can also detect if the EGR has stopped functioning as the mass of fresh air entering the engine will increase, this is not so bad as the first case.
- MAF - Boost leak: The ECU can detect if there is a boost leak as the air mass through the sensor will be higher than what the engine can actually flow. Again this will cause smoke and low power, it's important not to keep powering the turbo up in this instance as the turbo can over speed as there is not enough pressure after the compressor to restrict it.
From the above points, it's clear that deleting a MAF can both hide important faults and also affect your fuel economy (and even risk an MOT failure due to high smoke emissions).
The bottom line of it is that we require you to have a fully functioning MAF to go with your remap, else you'll be down on power.
We won't remove your MAF unless you're running a much larger stage 3 turbo, even in this case we recommend calibrating a MAF that can read a higher air flow.
It's important that you replace a faulty MAF with a genuine Siemens VDO unit, the cheap MAFs from ebay can cause engine instability (lumpy idle), power loss or high smoke levels. At HDI Tuning we do things properly, we don't compromise on quality.
Engine problems and advice:
My 2.0 or 2.2 HDI cuts out under full load, what is wrong with it?
There are several fault conditions at which the ECU is programmed to shut down the engine.
The most common cause of this is due to the fuel pressure demand not being met:
If the fuel pressure measured is more than 250 Bar below the requested set point, the ECU will shut down and store a fault code (P0230).
This can happen when the fuel pump is worn out (usually on high mileage cars) or the injectors are leaking fuel through.
Other conditions at which the engine will be shut down for 10 seconds are when the fuel pressure regulator duty cycle reaches 97% or if the fuel pressure drops at a rate of higher than 1000 bar per second. This causes a shut down as the ECU will think there is a fuel leak.
99% of the time this problem can be fixed for free by removing the fuel pressure regulator from the right side of the fuel pump and giving it a clean. (Be careful to avoid damaging the O-rings with your cleaning fluid. Also the two Torx screws holding in the fuel pressure regulator are made of a very soft metal. Be sure to get your tool square on before attempting to loosen.)
Another common problem on the HDI is the low pressure lift pump. This can become blocked up or worn and fail to supply enough fuel to the high pressure pump.
If you're having problems, get in touch and we will advise on the best course of action.
My HDI continues to run for a couple of seconds when I switch it off?
This is a very common fault, and luckily you've found the free solution. The control mechanism which regulates fuel pressure can often jam due to dirt.
When you shut the engine down the ECU will continue firing the injectors until the fuel pressure is relieved.
To fix this you just need to remove the fuel pressure regulator from the side of the fuel pump, clean it and replace it. I would recommend cleaning with compressed air and possibly a solvent, avoid damaging the rubber seals.
My car is displaying an 'anti pollution' fault?
This is a very common fault on the PSA cars and vans, however it's also a generic fault code that can cover a lot of things. Before we can advise on what we think you need to do, you'll need to connect with diagnostics to read the fault codes.
My car is displaying the 'Unlock Diesel Filter' fault?
This indicates that you DPF is clogged. Please read here to see how to get rid of this problem.
My car is down on power, will a remap fix this?
No, a remap is not the fix to a fault with your car, you must fix all problems before remapping. Common fault causes are:
The Mass Air Flow-meter (MAF) - When worn this will under-read and the cars control system will limit fuel to the engine and hence power will be down. If over 100k we would recommend fitting a new one as these parts are consumable due to the way in which the hot wire anemometer inside operates. It is very common for the MAF to be faulty on modern cars. When replacing the MAF, only ever use the genuine part and not a copy, this can cause more problems than you had to begin with.
The EGR system - If the EGR is permanently open it can reduce power, induce lots of smoke and also irregular idle. Read here for more information.
Boost control solenoid - This is only relevant to cars with electronic boost control. These are the 2.0 110, 2.2 136 and all 1.6HDI models. If the boost control solenoid develops a fault the turbo will not spool up. Basically the default position when faulty is minimum boost pressure for safety reasons. You'll notice a massive drop in power and won't be able to hear your turbo spooling up.
All of these faults can give similar effects, if unsure, get a mechanic to connect diagnostics equipment and read for fault codes. Also check live engine parameters whilst loading the engine.
My HDI has a loud tapping noise that stops at 3K RPM?
This is more common on vehicles with very high miles. Here the solenoids in the injector cannot keep up with both the pilot and main injection and it will begin to rattle. The noise will stop dead at 3K RPM at the same point at which pre-injection stops.
To fix, fit a set of low mileage injectors. These are preferable to refurbished injectors as these typically use inferior parts which wear quickly.
I am having problems with my OBD tool
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