Diesel Fuel Injection System Help Desk

[Dieseldude]

Good day Sir DD,

Problem here: Isuzu Elf truck 4GG1 NA engine. This is the first time I hear about an Isuzu 4GG1. Could it be a 4JG1? Is this an electronic engine?

No hard starts. Practically no smoking on idle but smokes a little "off white" on highway runs especially on acceleration. Sluggish power on acceleration producing that kind of smoke. Was any previous work done on this engine that may have caused this problem?

One specialist quoted P20k on calibration. A good price? I really don't know as I've never heard of this engine type.

Thanks in advance for any comment and suggestion. Check pump to engine timing.

[miked]

Good day Sir DD,

Problem here: Isuzu Elf truck 4GG1 NA engine. This is the first time I hear about an Isuzu 4GG1. Could it be a 4JG1? Is this an electronic engine?

No hard starts. Practically no smoking on idle but smokes a little "off white" on highway runs especially on acceleration. Sluggish power on acceleration producing that kind of smoke. Was any previous work done on this engine that may have caused this problem?

One specialist quoted P20k on calibration. A good price? I really don't know as I've never heard of this engine type.

Thanks in advance for any comment and suggestion. Check pump to engine timing.

Oops. Sorry sir. 4HG1. had a talk with the driver-operator recently. the unusual smoking and sluggish power occured after filling-up with diesel. drained the fuel filter-separator. still there is white smoke. I suspect a water contamination problem with the fuel station. will fill up again another batch of diesel and see what happens.

no previous work done on the vehicle except the regular oil and filters(oil, air, fuel) replacement. it was a surplus unit and running for 2 years now. the problem occured last week.

thank you sir

[junver]

sir dieseldude, kung inilalagay yung rpm 750 na may load na aircon which is ito naman ang naka lagay na normal idling, yun na nag wawala na ang engine. pero kung ibinababa naman sa 650 na may load na aircon hindi na nagwa wild. pero pag walang load na aircon ok at ang ganda ng andar ng makina patri ang hatak ok.. salamat po sa reply nyo kanina. sana po matulungan nyo ako.

[Dieseldude]

sir dieseldude, kung inilalagay yung rpm 750 na may load na aircon which is ito naman ang naka lagay na normal idling, yun na nag wawala na ang engine. Paano nag wawala ang engine kung nailalagay mo ang rpm sa 750?

pero kung ibinababa naman sa 650 na may load na aircon hindi na nagwa wild. pero pag walang load na aircon ok at ang ganda ng andar ng makina patri ang hatak ok.. salamat po sa reply nyo kanina. sana po matulungan nyo ako. Gusto kita tulungan pero do ko maintindihan ang post mo.

[Dieseldude]

Oops. Sorry sir. 4HG1. had a talk with the driver-operator recently. the unusual smoking and sluggish power occured after filling-up with diesel. drained the fuel filter-separator. still there is white smoke. I suspect a water contamination problem with the fuel station. will fill up again another batch of diesel and see what happens. This is a correct next step before considering any repairs.

no previous work done on the vehicle except the regular oil and filters(oil, air, fuel) replacement. it was a surplus unit and running for 2 years now. the problem occured last week. Your problem seems to be fuel related. Keep us posted as your experience may help other Tsikoters.

thank you sir You're welcome.

[junver]

Sir dieseldude,

good day po!

4ja1 engine po, pag bagong, start palang ang makina na medyo malamig pa at naka on ang aircon, ok naman ang idling,


pero, pag mainit na ang engine , bumababa na ang rpm at lumalakas ang vibration.


Pero kung hindi naka on ang aircon ok naman ang idling, at hatak ng makina.


Ano po kaya ang problema ng makina ko? May kinalaman po kaya ito sa injection pump?


Kung malapit lang sana ako dyan sa shop nyo, punta ka agad ako dyan. Alam ko naman po na matutulungan nyo ako. Kaya lang po dito ako sa leyte province region 8.

Thanks in advance and god bless.

Junver

[Dieseldude]

Sir dieseldude,

good day po!

4ja1 engine po, pag bagong, start palang ang makina na medyo malamig pa at naka on ang aircon, ok naman ang idling. Pero, pag mainit na ang engine , bumababa na ang rpm at lumalakas ang vibration. Pero kung hindi naka on ang aircon ok naman ang idling, at hatak ng makina.
Meron bang ginalaw sa engine mo bago lumabas itong problem?


Ano po kaya ang problema ng makina ko? May kinalaman po kaya ito sa injection pump? Mukhang ok ang injection pump.
1) Recheck idle adjustment and idle-up device.
2) Check amount of refrigerant loaded on aircon; baka sobra. Check low and high side pressure of aircon.
3) Verify any previous work performed on the engine.

Kung malapit lang sana ako dyan sa shop nyo, punta ka agad ako dyan. Alam ko naman po na matutulungan nyo ako. Kaya lang po dito ako sa leyte province region 8.

Thanks in advance and god bless. You are welcome.

Junver

[miked]

Oops. Sorry sir. 4HG1. had a talk with the driver-operator recently. the unusual smoking and sluggish power occured after filling-up with diesel. drained the fuel filter-separator. still there is white smoke. I suspect a water contamination problem with the fuel station. will fill up again another batch of diesel and see what happens. This is a correct next step before considering any repairs.

no previous work done on the vehicle except the regular oil and filters(oil, air, fuel) replacement. it was a surplus unit and running for 2 years now. the problem occured last week. Your problem seems to be fuel related. Keep us posted as your experience may help other Tsikoters.

thank you sir You're welcome.

sir DD,

still on the process of consuming the previous diesel fuel. about 3/4 fuel left as of this writing as the vehicle is not usually used. on the average, about once a week. could this frequency of use contribute to the problem as the injection pump is not usually "exercised and lubricated" by diesel?

to add up some info. with the truck not running (engine on), blipping the throttle produces a combination of severely white and not so severe black smoke with the engine running roughly.

thank you sir.

[Dieseldude]

sir DD,

still on the process of consuming the previous diesel fuel. about 3/4 fuel left as of this writing as the vehicle is not usually used. on the average, about once a week. could this frequency of use contribute to the problem as the injection pump is not usually "exercised and lubricated" by diesel? Rapid pump failure can happen if water is present in your fuel. Quality of clean diesel fuel deteriorates over time due to bacterial growth and accumulation of moisture. As a safe rule, diesel fuel should be disposed of if stored for more than 8 months. Try this: put fresh diesel fuel in a small container, connect your fuel suction and return lines to this container, and run your engine. If performance improves, then you know that your problem is due to a fuel quality issue.

to add up some info. with the truck not running (engine on), blipping the throttle produces a combination of severely white and not so severe black smoke with the engine running roughly. Check pump timing, valve clearances, and air intake system for restriction. You can also bring your van to a qualified diesel workshop.

thank you sir.

[miked]

sir DD,

still on the process of consuming the previous diesel fuel. about 3/4 fuel left as of this writing as the vehicle is not usually used. on the average, about once a week. could this frequency of use contribute to the problem as the injection pump is not usually "exercised and lubricated" by diesel? Rapid pump failure can happen if water is present in your fuel. Quality of clean diesel fuel deteriorates over time due to bacterial growth and accumulation of moisture. As a safe rule, diesel fuel should be disposed of if stored for more than 8 months. Try this: put fresh diesel fuel in a small container, connect your fuel suction and return lines to this container, and run your engine. If performance improves, then you know that your problem is due to a fuel quality issue.

to add up some info. with the truck not running (engine on), blipping the throttle produces a combination of severely white and not so severe black smoke with the engine running roughly. Check pump timing, valve clearances, and air intake system for restriction. You can also bring your van to a qualified diesel workshop.

thank you sir.

thank you sir. i'll do your suggestion of using a container with fresh diesel. will update soon.

[miked]

sir DD, i have to conclude that it was water contamination. truck runs normally as of now. it was used daily this week. the water at the bottom of the tank maybe consumed already. thanks