Diesel Fuel Injection System Help Desk

[DieselDI]

Sir Dieseldude,

Good day sir, help naman po. Had my nozzle tips replaced few days ago, medyo mausok kasi before tsaka malakas na sa diesel, malaki na rin yung hole nung tip tsaka leaking na. After nung replacement nawala talaga yung usok tska medyo tumipid sa tingin ko pero pansin ko parang medyo humina yung pulling power, hirap na maka-abot ng 100kph minsan kahit 80kph lang hirap na rin. Before ako magpapalit ng tip, pinacheck ko yung Injection Pump ko, good pa naman daw but it was more than 3 years since last calibrated. Bagong palit lang fuel filter, regular oil changed every 5k kms, 2k km na yung tinakbo since last oil change and air filter replacement. no problem sa starting, ok din ang idle. Any possible trouble po sir? by the way my ride is a 97 Isuzu TFR (4JA1).

Thanks

[Dieseldude]

Sir Dieseldude,
This is quite a simple question, I'm a newbie on diesels anyway..But what is the reason why diesel engine vehicles only have a maximum of 6k rpm in their tachometer (I think 4.5k rpm pa lang, start na ng redline)? While the gas engine has 8k-9k+ max rpm?

Thanks po!

This is a tough question. But if my memory serves me right, I think it is due to the slower burning characteristic of diesel fuel than gasoline, and the single injection shot per engine revolution of older injection systems.

CRDI systems are now operating on higher rpm due to higher pressures (better fuel automization), as well as a more variable injection timing, and multi injection shots per engine revolution.

[Dieseldude]

tnx for a straight forward answer on my inquiry

yet regarding this inquiry dont I have on my engine to help cool down the turbo before it shuts down? You don't have to cool down the turbo on city driving as it doesn't get that hot. You may need to cool it down after long uphill climbs by just idling the engine for a few minutes before shutting down.

what I mean is that, havent my (toyota) manufacturer thought of this, for buyers wont not need to put this aftermarket part on their car... I'm sure Toyota knows this, and they don't see a need for it. We haven't seen premature turbo failures on Toyota D4Ds.

anyway my car is an Innova J d4d

tnx again...

[Dieseldude]

Sir Dieseldude,

Good day sir, help naman po. Had my nozzle tips replaced few days ago, medyo mausok kasi before tsaka malakas na sa diesel, malaki na rin yung hole nung tip tsaka leaking na. After nung replacement nawala talaga yung usok tska medyo tumipid sa tingin ko pero pansin ko parang medyo humina yung pulling power, hirap na maka-abot ng 100kph minsan kahit 80kph lang hirap na rin. Before ako magpapalit ng tip, pinacheck ko yung Injection Pump ko, good pa naman daw but it was more than 3 years since last calibrated. Bagong palit lang fuel filter, regular oil changed every 5k kms, 2k km na yung tinakbo since last oil change and air filter replacement. no problem sa starting, ok din ang idle. Any possible trouble po sir? by the way my ride is a 97 Isuzu TFR (4JA1).

Thanks

Check injection pump.

[Dieseldude]

sir dieseldude, i have a 2001 hilander sl and it emits too much white smoke when accelerating at every gear. the engine doesn't consume oil and city driving fuel consumption is 12 to 13 km/l, so i ruled out that it has a loss compression. but the oil dip stick shows some white smoke but our mechanic said that it is normal because it doesn't spits oil. could it be a faulty injector?

i have the injector cleaned at a calibration shop near us but excessive white smoke when accelerating is still there. pressure showed +-170 something on all injection nozzle and the mechanic said that it is normal. but i'm unsure of what he said because on the plate on the engine bay indicates it should be 185kg/cm2.

can i please have an advise?

thanks in advance for the reply

If we assume that your nozzles are good, try these:

1) Check injection pump timing

2) Check valve clearance

3) Check compression

4) Check injection pump

[Dieseldude]

dieseldude, here's another problem of mine. every morning when i start my pick up, it's idling like it's running out of fuel, but after a few seconds, the idling will be normal again. this is consistent every morning for the last 2 weeks. one of our mechanic told me that it could be the injection pump check valve. He said that the lines from the injection pump going to the injector maybe loosing fuel overnight because of a faulty check valve and that would explain why my pick up is "PALYADO" every morning when i start it,
what do you think is the problem? need help.. thanks in advance for the reply.

1) Check condition of glow plugs

2) Check engine compression

3) Check injection pump

[speed unlimited]

Baka kailangan ng i calibrate iyong injection pump halos 3 years na sabi mo kaya mausok at malakas sa Diesel . Alam mo naman na hindi maganda ang quality ng diesel fuel rito sa atin.

[DieselDI]

Thanks po sa reply, pa-check ko na lang po muna yung injection pump nung pick up ko.

[luoykaayo69]

Good day, Sir Dieseldude! I've owned a 1st Gen Sportage, Diesel, Naturally Aspirated, Surplus Unit, for more than 2 years now.

Two weeks ago, I noticed nga mahirap siya i-start in the morning. Once successfully started, the rpm reads below the setting at 750-800, and the unit shakes a bit for a few seconds (like 1-2 secs) then aangat yung rpm to the idling setting at 750-800. At hindi na nag shake yung vehicle. Afterwards, napaka smooth na nang acceleration at takbo.

This concern (low rpm when starting and normalizes after 1-2 secs) repeats everytime I start the engine anytime during the day, kahit mainit pa ang makina from a prior drive.

I inquired with a mechanic-friend, at sabi niya my fuel pump needs replacement dahil daw malambot na nung top part nito if pressed. This was his observation two years ago also...na malambot daw ang fuel pump ko...but I did not change the fuel pump coz wala naman po akong problem with start-up and normal and stable naman po ang takbo.

I read in the previous post about the "palyado" pick up caused probably with a leaking check valve...

Btw, eversince this problem comes up, I tried pumping up manually (press up and down) the fuel pump in the morning to no effect. Same pa rin ang result with or without manual pumping.

Also, the injection pump was re-calibrated early February 2008.

Hope you can enlighten me on this. Thanks a lot.

[Dieseldude]

Good day, Sir Dieseldude! I've owned a 1st Gen Sportage, Diesel, Naturally Aspirated, Surplus Unit, for more than 2 years now.

Two weeks ago, I noticed nga mahirap siya i-start in the morning. Once successfully started, the rpm reads below the setting at 750-800, and the unit shakes a bit for a few seconds (like 1-2 secs) then aangat yung rpm to the idling setting at 750-800. At hindi na nag shake yung vehicle. Afterwards, napaka smooth na nang acceleration at takbo.

This concern (low rpm when starting and normalizes after 1-2 secs) repeats everytime I start the engine anytime during the day, kahit mainit pa ang makina from a prior drive.

I inquired with a mechanic-friend, at sabi niya my fuel pump needs replacement dahil daw malambot na nung top part nito if pressed. This was his observation two years ago also...na malambot daw ang fuel pump ko...but I did not change the fuel pump coz wala naman po akong problem with start-up and normal and stable naman po ang takbo.

I read in the previous post about the "palyado" pick up caused probably with a leaking check valve...

Btw, eversince this problem comes up, I tried pumping up manually (press up and down) the fuel pump in the morning to no effect. Same pa rin ang result with or without manual pumping.

Also, the injection pump was re-calibrated early February 2008.

Hope you can enlighten me on this. Thanks a lot.

This is probably due to the cooler temperatures.

Try these:

1. Try using multigrade oil like 15W30. Your present oil's viscosity may be too thick.
2. Check your glow plug system.

If it doesn't improve:

1. Check engine compression
2. Check injection pump
   

[msvan]

sir, newbie lang po ako sa diesel.... ask ko lang po kung iisa lang po ba yung tinatawag nilang glow plug timer relay and glow plug relay? or magkaiba yun? and ask ko na rin kung ano problem kung yung emission nung makina medyo masakit sa mata and ilong pero di naman siya mausok? kasi yung mazda e2000 power van namin pinapalitan ko ng R2 na engine. thanks!

[luoykaayo69]

Sir Dieseldude...thanks a lot for the advice.

[Dieseldude]

sir, newbie lang po ako sa diesel.... ask ko lang po kung iisa lang po ba yung tinatawag nilang glow plug timer relay and glow plug relay? or magkaiba yun? Depende yan sa car mo. Kung minsan magkahiwalay sila, and sometimes, integrated sila.

and ask ko na rin kung ano problem kung yung emission nung makina medyo masakit sa mata and ilong pero di naman siya mausok? kasi yung mazda e2000 power van namin pinapalitan ko ng R2 na engine. thanks! Depende rin sa car make and model yan. Meron mga diesels na ganyan talaga ang characteristic ng exhaust. Ganyan na ba yan nung bago pa sha?

[msvan]

sir, newbie lang po ako sa diesel.... ask ko lang po kung iisa lang po ba yung tinatawag nilang glow plug timer relay and glow plug relay? or magkaiba yun? Depende yan sa car mo. Kung minsan magkahiwalay sila, and sometimes, integrated sila.

and ask ko na rin kung ano problem kung yung emission nung makina medyo masakit sa mata and ilong pero di naman siya mausok? kasi yung mazda e2000 power van namin pinapalitan ko ng R2 na engine. thanks! Depende rin sa car make and model yan. Meron mga diesels na ganyan talaga ang characteristic ng exhaust. Ganyan na ba yan nung bago pa sha?

thanks sa reply sir.... before kasi gasoline engine siya tapos pinalitan ko ng diesel engine.

[Dieseldude]

thanks sa reply sir.... before kasi gasoline engine siya tapos pinalitan ko ng diesel engine.

Medyo babagal ang top speed mo kung hindi ka nagpalit ng differential.

[msvan]

Medyo babagal ang top speed mo kung hindi ka nagpalit ng differential.

reg sa top speed i think ok lang..... kasi pang hatid sundo lang naman ng anak ko sa school....

the only problem na nakikita ko ngayon sa van is yung alternator niya. pag start mo ng engine ang reading ng volt meter is 13.75v then pag on mo ng aircon nagiging 12 to 12.25v then pag sinabay mo pa yung headlight nagiging 10.5v to 11v na lang yung volt niya. the alternator is 40amp. ano kaya magandang remedyo sir? palit alternator? if palit alternator pang anong makina ang puwede ipalit? thanks ulit....

[Dieseldude]

reg sa top speed i think ok lang..... kasi pang hatid sundo lang naman ng anak ko sa school....

the only problem na nakikita ko ngayon sa van is yung alternator niya. pag start mo ng engine ang reading ng volt meter is 13.75v then pag on mo ng aircon nagiging 12 to 12.25v then pag sinabay mo pa yung headlight nagiging 10.5v to 11v na lang yung volt niya. the alternator is 40amp. ano kaya magandang remedyo sir? palit alternator? if palit alternator pang anong makina ang puwede ipalit? thanks ulit....

Nag didischarge ba ang battery? Alternators are not my line, but 40 amps seems to be sufficient.

1. Check your voltmeter. It just might be giving wrong readings.
2. Check for loose terminals, wiring connections.
   
3. Did you change any pulley sizes during the engine conversion? Alternator may be turning too slow.
4. Alternator my be faulty. Have an electrician check the alternator/voltage regulator before replacing it.

[ajOT]

Sir I got an Innova J D4D
is that a water cooled or oil cooled?
what is the difference between the performance?

as Page 1 of his thread shows oil is to lubricate, water is for cooling... so can the vehicle have both for it to function at its topmost....

[msvan]

Nag didischarge ba ang battery? Alternators are not my line, but 40 amps seems to be sufficient.

1. Check your voltmeter. It just might be giving wrong readings.
2. Check for loose terminals, wiring connections.
   
3. Did you change any pulley sizes during the engine conversion? Alternator may be turning too slow.
4. Alternator my be faulty. Have an electrician check the alternator/voltage regulator before replacing it.

thanks sa reply ulit sir.... maybe alternator ang problem. kasi pag on lahat at nag drop sa 11v kahit anong rev mo ayaw na umangat.....

[ajOT]

Sir, as to when is the vehicle needs to be put unto calibration center?
what does a Calibration Center usually check and what do they really do to your engine - yes, to calibrate your engine thats why they are called calibration center - can you kindly, put it into laymans term/easy to understand why an engine needs to be calibrated...
is it only diesel engine(s) that needs to be calibrated?

* am just curious coz there are numerous calibration center am seeing here in my place - but most of them are fixin jeepneys not private cars, as to what I noticed...

thank you...