Diesel Fuel Injection System Help Desk

[timo07]

Hi Sir Dieseldude,

My ride is a JDM Pajero, 4d56 TDIC engine and A/T.

Problem is when I go on a full stop, o kahit slow down lang na almost stop na, parang nasasakal/nabubulunan yung makina. Kahit anong rev mo ayaw umusad. Maghihintay ka ng mga 3-4 seconds bago mo maramdaman na magaan na ulit sya saka ako aapak ulit sa accelerator tapos aandar na sya. Di naman namamatay ang makina. Ramdam ko din na kahit nasa D ang A/T setting pag binitawan mo yung accelerator habang umaandar parang nakaapak ako slightly sa brake.

Dinala ko sya sa isang shop this weekend. Ang ginawa nila to test ni-rev ng ni-rev ang makina while A/T is at P. Sabi baka calibration kailangan kaya lang ang laki ng quote kaya di ko pinaayos. Pag-alis ko sa shop pakiramdam ko mas nakahinga makina. Di na lumalabas yung problema pag slow down lang pero pag full stop ganun pa din. Somehow, I guess, nakatulong yung pag-rev nila paulit ulit ng todo sa makina.

Air filter is two weeks old, changed fuel filter January this year, change oil and oil filter last month.

What could be the problem here, sir?

Salamat po.

HI! I hope you and Dieseldude doesn't mind. Your fuel filter has been changed last January so it must be needing replacement already. Even if you seldomly use your vehicle like me, I think you should have reached 5000km of travel already since January. It is recommended for diesel engine fuel filters to be changed every 5000km. I hope this will help you in addressing your concerns.

[Dieseldude]

Sir Dieseldude:

So just to confirm - on the BOSCH Mechanical Governor VE pumps, there seems to be NO control of the injection timing advance for LOAD - just for SPEED. Yes.

Is there a provision for injection timing advance on Electronically-governed BOSCH VE pumps? Yes the timing control valve.

You also mentioned that during large increases of load injection timing RETARDS due to loss of fuel pressure. Yes.

If that is so, can it be compensated for by placing a pressure-sensitive valve on the pump restriction/outlet so that losses in pressure are compensated for? An overflow valve is normally installed on the fuel return port. There are two pressure areas on the VE pump; one is behind the timing device piston to control timing, the other is in the housing cavity.

You know on old-model gasoline cars, there is usually a tap to the carburetor's venturi's that connects to a vacuum-advance diaphragm on the distributor.

This serves to advance ignition timing with load - as higher engine airflows result in higher vacuum/depression.

Thus even with engine RPM's low, if you step hard on the accelerator, the high initial airflow causes ignition timing to advance.

If you remove or disconnect this advance line the car's performance is severely affected. Sorry, I don't know much about petrol engines.

Is this lack of timing advance under load one of the reasons older diesel engines don't perform as well as their gasoline counterparts? Mechanical and hydraulic timing devices are limited in their capability to alter timing. The common rail system has solved this problem.

Thanks again.

Dusky Lim

[Dieseldude]

Hi Sir Dieseldude,

My ride is a JDM Pajero, 4d56 TDIC engine and A/T.

Problem is when I go on a full stop, o kahit slow down lang na almost stop na, parang nasasakal/nabubulunan yung makina. Kahit anong rev mo ayaw umusad. Maghihintay ka ng mga 3-4 seconds bago mo maramdaman na magaan na ulit sya saka ako aapak ulit sa accelerator tapos aandar na sya. Di naman namamatay ang makina. Ramdam ko din na kahit nasa D ang A/T setting pag binitawan mo yung accelerator habang umaandar parang nakaapak ako slightly sa brake.

Dinala ko sya sa isang shop this weekend. Ang ginawa nila to test ni-rev ng ni-rev ang makina while A/T is at P. Sabi baka calibration kailangan kaya lang ang laki ng quote kaya di ko pinaayos. Pag-alis ko sa shop pakiramdam ko mas nakahinga makina. Di na lumalabas yung problema pag slow down lang pero pag full stop ganun pa din. Somehow, I guess, nakatulong yung pag-rev nila paulit ulit ng todo sa makina.

Air filter is two weeks old, changed fuel filter January this year, change oil and oil filter last month.

What could be the problem here, sir?

Salamat po.

Baka barado ang exhaust pipe mo? Kung walang bara, nasa fuel or air intake sytem ang problem.

Fuel System: barado fuel filter, nakaka sipsip ng hangin, wrong timing, faulty injection pump

Air intake: Barado air filter, faulty EGR, Faulty turbo

[Dieseldude]

hi sir dieseldude. di ko makita part no. ng pump assembly ng 4m41 e. anyways, oks lang po ba na tinanggal ng mechanic ko yung hose tapos pinasakan or kelangan talaga metal plate pamblock sa egr? thanks

Personally, oks yan. But professionally, hindi okay yan dahil tataas ang NOX emissions mo.

Remedyo ang ginawa ng mekaniko, hindi repair.

[Dieseldude]

HI! I hope you and Dieseldude doesn't mind. All suggestions are welcome in this site.......nobody has a monopoly of knowledge. Sharing is caring.

Your fuel filter has been changed last January so it must be needing replacement already. Even if you seldomly use your vehicle like me, I think you should have reached 5000km of travel already since January. It is recommended for diesel engine fuel filters to be changed every 5000km. I hope this will help you in addressing your concerns.

[vyn300d]

Personally, oks yan. But professionally, hindi okay yan dahil tataas ang NOX emissions mo.

Remedyo ang ginawa ng mekaniko, hindi repair.

oh i see. many owners said kasi na di nila binoblock egr kasi baka mag "check engine" kapag tinanggal hose. pero in my case wala naman, so kapag hinarangan ng metal plates i guess di na rin po kaya iilaw check engine?

[Dieseldude]

oh i see. many owners said kasi na di nila binoblock egr kasi baka mag "check engine" kapag tinanggal hose. pero in my case wala naman, so kapag hinarangan ng metal plates i guess di na rin po kaya iilaw check engine?

Hindi iilaw kung lalagyan mo ng harang.

[rdboy]

Sir Dieseldude, our 2005 Starex has white smoke coming out when dipstick is removed. Pero pag hindi naman tinanggal, walang smoke. Tinry ko lang gawin kasi ganon daw pagcheck if the engine has problems. white smoke ang lumalabas. wala naman oil.
Normal ba ito? Walang traces ng oil sa coolant and hindi naman nababawasan ang langis. Very well maintained ang van. The engine is running very well and hindi pa nagoverheat. Wlang leak or traces ng leak sa block. It's crdi. Blow by ba ang tawag dito? Or is this normal? Pag tinanggal ang oil cap when engine is running may tumatalsik na oil pero walang smoke.

[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.

[Dieseldude]

Sir Dieseldude, our 2005 Starex has white smoke coming out when dipstick is removed. Pero pag hindi naman tinanggal, walang smoke. Tinry ko lang gawin kasi ganon daw pagcheck if the engine has problems. white smoke ang lumalabas. wala naman oil.
Normal ba ito? Walang traces ng oil sa coolant and hindi naman nababawasan ang langis. Very well maintained ang van. The engine is running very well and hindi pa nagoverheat. Wlang leak or traces ng leak sa block. It's crdi. Blow by ba ang tawag dito? Or is this normal? Pag tinanggal ang oil cap when engine is running may tumatalsik na oil pero walang smoke.

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