Diesel Fuel Injection System Help Desk

**Dieseldude** · September 16th, 2010 10:26 AM

Originally Posted by Jiggs

*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** · September 16th, 2010 08:07 PM

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** · September 16th, 2010 10:37 PM

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** · September 17th, 2010 12:28 PM

Originally Posted by Dieseldude

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** · September 19th, 2010 01:29 PM

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** · September 19th, 2010 10:51 PM

*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** · September 19th, 2010 11:19 PM

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

**Dieseldude** · September 20th, 2010 08:12 AM

Originally Posted by Wh1stl3r

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

None that I know of.

Emissions will suffer at low idle and part load.

**Dieseldude** · September 20th, 2010 08:31 AM

Originally Posted by 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.

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** · September 20th, 2010 08:47 AM

Originally Posted by 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

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.