Diesel Fuel Injection System Help Desk

[Dieseldude]

*Dieseldue
Sir can you pls. give us an idea how do these Engine/Car manufacturers tune or de-tune their EuroV CRDI's engine to suit the EuroII level fuel for other country such as ours. Do they reduce rail pressures or differrent bore of injectors? The only thing that I could see differrent is the power rating mas mababa ng a few horses for same displacement. Thanks.

ECU programming...

[Jiggs]

Ok..so its just a basic ECU tuning lang pala...same injectors, rail pressures pa rin. Now am at a lost how can a simple lowering of power output of engine could now suit the higher content of sulfur on its fuel? Ano kaya theory dun?

How about kaya ang mga BMW, Audi, Benz? do they de-tune also their engine for our current fuel specs?

[Dieseldude]

Ok..so its just a basic ECU tuning lang pala...same injectors, rail pressures pa rin. Hindi kaya ng tuning lang, lalo na kung malaki ang dagdag na hp. More hp = more fuel = more heat.

Now am at a lost how can a simple lowering of power output of engine could now suit the higher content of sulfur on its fuel? Ano kaya theory dun? Hindi ko alam....

How about kaya ang mga BMW, Audi, Benz? do they de-tune also their engine for our current fuel specs? I don't know............

[rdboy]

Don't worry........this is normal.

Thank you Dieseldude! I also tried doing it on my Alterra. Ganun din ang nangyayari. It's normal pala. It also has white smoke pag tinanggal mo ang dipstick while engine is hot and running. Pag nakakabit naman wala. Oil and coolant level is stable. Very meticulously maintained too. But I noticed na may konting oil sa side ng block. It's not dripping. Parang oil and dust na nag accumulate. Should I be alarmed? Should I have the gasket replaced asap? It's 102,000km. Should I also have the PCV valve checked? Thanks!

[dvldoc]

Dieseldude how much can a Zexel COVEC pump be safely bumped up to give more fueling. It's on my Nissan Elgrand with the 3.2 QD32TI engine. It will be some axillary injection mods to help burn the extra fuel i.e the water injection kit. I plan to up the boost about 3psi and install a 2.75 or 3" exhaust on the vehicle.

Thanks

[manta]

*Dieseldude
Sir, i have a local nissan safari with a td42 engine with inline type injector. It would emit black smoke when going uphill, even if the engine is newly tuned (change fuel and air filter and adjust valve clearance) and the oil is newly changed. Also, a few seconds would pass before the engine would die if i turn the engine off via the ignition key. There is also some noticeable loss of power especially when carrying heavy loads. Is this injector related and does it need servicing? Thanks.

[Wh1stl3r]

*Dieseldude,
Any bad effects on EGTs with EGR blocking?

[Dieseldude]

*Dieseldude,
Any bad effects on EGTs with EGR blocking?

None that I know of.

Emissions will suffer at low idle and part load.

[Dieseldude]

*Dieseldude
Sir, i have a local nissan safari with a td42 engine with inline type injector. It would emit black smoke when going uphill, even if the engine is newly tuned (change fuel and air filter and adjust valve clearance) and the oil is newly changed. Also, a few seconds would pass before the engine would die if i turn the engine off via the ignition key. There is also some noticeable loss of power especially when carrying heavy loads. Is this injector related and does it need servicing? Thanks.

Slow shutdowns may be due to a problem in the injection pump's diaphragm if it has one, or on the shutdown mechanism.

Black smoke....... pump diaphragm, restricted air intake, or overfuelling injection pump.

Low power.......air intake restriction most probably.

Inspect pump diaphragm, temporarily remove air filter to see if power improves and if black smoke is less.

[Dieseldude]

Dieseldude how much can a Zexel COVEC pump be safely bumped up to give more fueling. It's on my Nissan Elgrand with the 3.2 QD32TI engine. It will be some axillary injection mods to help burn the extra fuel i.e the water injection kit. I plan to up the boost about 3psi and install a 2.75 or 3" exhaust on the vehicle.

Thanks

Zexel Covec pumps can be bumped up. But since this is an electronic system, modifying calibrations will give you problems ...... rough idle, hunting, CEL on. I don't recommend it.

[dokidave]

Sir Dieseldude:

Can you give me a hint of how much is the nozzle tip of my isuzu fuego 1997 part# NP-DLLA158PN 209 I think this is Zexel brand?

Can you recommend a store where i can but it?

Thanks.

[rdboy]

*Dieseldude

Hi sir! I've been hearing a lot regarding shops that do "carbon cleaning" that costs around a couple of thousand pesos. It this safe to do with CRDIs? How do they do it?

[Dieseldude]

*Dieseldude

Hi sir! I've been hearing a lot regarding shops that do "carbon cleaning" that costs around a couple of thousand pesos. It this safe to do with CRDIs? How do they do it?

I don't know how "carbon cleaning" works. I hope it's function is to clean internal engine parts.

Please share what shops that do this service claim about this product.

[Jiggs]

Haven't tried it too..pero here's a local shop that offers that Carbon Clean..http://www.betancalibration.com/services.htm

[timo07]

Quote:
Originally Posted by timo07
How does resetting of the ECU improve Fuel Consumption?

The ECU records how much air you get, to proportion how much fuel to inject. After combustion, it measures the oxygen content in the exhaust gasses to further tune and find the appropriate most efficient fuel-air mixture. This system is not as dynamic as we think, the ECU usually takes time to completely adjust since there are historical data logged in it from your previous use. In this case, the fuel management settings being used by your engine now is partly based on your previous usage which is with non-v-power diesel, therefore confusing the ECU and knocking almost perfect air-fuel mixture out of proportion. When out of proportion, two things will happen:

a. Lean (more air less fuel) = This tends you to give you lesser power which in return makes you push the pedal harder. This results the same speed but twice the effort for the engine.

b. Rich (more fuel less air) = This tends you to give you more power since you have more fuel coming in the combustion chamber. But you are actually wasting fuel because not all the fuel is being used up due to the lack of air. Biggest waste is when at idle.

Resetting the ECU erases previous data logs and the ECU gets to memorize the new setting for the new fuel you have for a near-perfect air-fuel mixture.

Hope I explained it well.


Hi Dieseldude, can you provide your technical opinion on the above? Thanks.

[Wh1stl3r]

Yup, that's why getting to know your AFR is important. Overfuelling will kill your engine in the long run. Pag underfueled naman wala ka din economy because you tend to stay at lower gears.

[Dieseldude]

The ECU records how much air you get, to proportion how much fuel to inject. After combustion, it measures the oxygen content in the exhaust gasses to further tune and find the appropriate most efficient fuel-air mixture. Oxygen content in the exhaust can only be measured if the engine has a lambda/oxygen sensor. Not all engines have this feature.

This system is not as dynamic as we think, the ECU usually takes time to completely adjust since there are historical data logged in it from your previous use. Not all ECUs have "learn" capability.

In this case, the fuel management settings being used by your engine now is partly based on your previous usage which is with non-v-power diesel, therefore confusing the ECU and knocking almost perfect air-fuel mixture out of proportion. When out of proportion, two things will happen:
a. Lean (more air less fuel) = This tends you to give you lesser power which in return makes you push the pedal harder. This results the same speed but twice the effort for the engine.
b. Rich (more fuel less air) = This tends you to give you more power since you have more fuel coming in the combustion chamber. But you are actually wasting fuel because not all the fuel is being used up due to the lack of air. Biggest waste is when at idle. Should all ECUs be reprogrammed to accomodate V Power diesel and/or other fuels? I don't believe so.

Resetting the ECU erases previous data logs and the ECU gets to memorize the new setting for the new fuel you have for a near-perfect air-fuel mixture. I don't understand what you mean by resetting. Passive/inactive faults can be deleted, but I haven't heard of a way to erase previous data logs.

Hope I explained it well.


Hi Dieseldude, can you provide your technical opinion on the above? Thank you. I'm quite sure that V power and/or other diesel fuel manufacturers will formulate their products to conform with general OE standards.

[timo07]

The ECU records how much air you get, to proportion how much fuel to inject. After combustion, it measures the oxygen content in the exhaust gasses to further tune and find the appropriate most efficient fuel-air mixture. Oxygen content in the exhaust can only be measured if the engine has a lambda/oxygen sensor. Not all engines have this feature.

This system is not as dynamic as we think, the ECU usually takes time to completely adjust since there are historical data logged in it from your previous use. Not all ECUs have "learn" capability.

In this case, the fuel management settings being used by your engine now is partly based on your previous usage which is with non-v-power diesel, therefore confusing the ECU and knocking almost perfect air-fuel mixture out of proportion. When out of proportion, two things will happen:
a. Lean (more air less fuel) = This tends you to give you lesser power which in return makes you push the pedal harder. This results the same speed but twice the effort for the engine.
b. Rich (more fuel less air) = This tends you to give you more power since you have more fuel coming in the combustion chamber. But you are actually wasting fuel because not all the fuel is being used up due to the lack of air. Biggest waste is when at idle. Should all ECUs be reprogrammed to accomodate V Power diesel and/or other fuels? I don't believe so.

Resetting the ECU erases previous data logs and the ECU gets to memorize the new setting for the new fuel you have for a near-perfect air-fuel mixture. I don't understand what you mean by resetting. Passive/inactive faults can be deleted, but I haven't heard of a way to erase previous data logs.

Hope I explained it well.


Hi Dieseldude, can you provide your technical opinion on the above? Thank you. I'm quite sure that V power and/or other diesel fuel manufacturers will formulate their products to conform with general OE standards.

The above was posted in the Innova thread. I'm trying to understand how could ECU resetting (via the temporary removal of battery power) be able to have an effect on fuel economy. Anyway I don't think it's useful to remove the power supply every now and then. Thanks Dieseldude.

[Dieseldude]

The above was posted in the Innova thread. I'm trying to understand how could ECU resetting (via the temporary removal of battery power) be able to have an effect on fuel economy. Anyway I don't think it's useful to remove the power supply every now and then. Thanks Dieseldude.

You're welcome.

Faults are classified into two types, passive and active. Only passive faults (past corrected faults still logged in the ECU) are deleted when the battery is disconnected. Active faults cannot be deleted unless they have been corrected.

[timo07]

You're welcome.

Faults are classified into two types, passive and active. Only passive faults (past corrected faults still logged in the ECU) are deleted when the battery is disconnected. Active faults cannot be deleted unless they have been corrected.

Yeah. I cannot even imagine how these logged data (faults) help to control fuelling of the engine.

On the assumption that there is an O2 sensor available, does the computer box actually log O2 sensor readings, and use this to optimize fuel injection and desired emission? In my limited knowledge, I don't believe so. It should be referring to real time data, so to speak, shouldn't it?