Diesel Fuel Injection System Help Desk

[Horsepower]

Sir Dieseldude,

I have suggested to my uncle that he brings his Super Grandia to your shop in Q.Ave. You also fix Denso right? (D-4D)?

The problem, as diagnosed by Toyota (though it's strange), is that one of the injectors is not working. However, the car is working fine, it doesn't shake, it has the same power as before. Toyota alleges that the Check Engine warning indicates that one of the injectors is malfunctioning but i have talked to another diesel mechanic friend of mine and he said if one of the injectors has indeed failed, it will wiggle and shake wildly. He suggested I have it checked (pressure check or something like that) so I thought of having it brought to your shop. Is this correct?

Thanks a lot.

[Dieseldude]

Hi Sir Dieseldude. Itanong ko lang yhe easiest way to tell if the turbo of a 4d56 engine is functioning. kasi parang hindi hindi sya gumagana especially kapg na hit nya 2000 rpm. I have a montero kasi. when i accelerate and the rpm touches the 2000 mark, madidinig mo and feel the response of the engine. Measure boost with a boost gauge if you have one. Another way (but not accurate) is: rev up the engine, and look/feel the hose to the intake manifold for pressure. As you rev up, this hose will expand and become rigid if the turbo is building pressure..

Hope you can help. Thanks in advance.

PS.

May alam po ba kayo tungkol sa rotrex supercharger? Sorry, never heard of this product.

TIA

[Dieseldude]

Sir Dieseldude,

I have suggested to my uncle that he brings his Super Grandia to your shop in Q.Ave. You also fix Denso right? (D-4D)? Yes..

The problem, as diagnosed by Toyota (though it's strange), is that one of the injectors is not working. The supposedly "not-working" injector is still working. But its fuelling contribution may not be the same as the three injectors'. This can be seen with a scan tool.

However, the car is working fine, it doesn't shake, it has the same power as before. Good.

Toyota alleges that the Check Engine warning indicates that one of the injectors is malfunctioning but I have talked to another diesel mechanic friend of mine and he said that if one of the injectors has indeed failed, it will wiggle and shake wildly. This is true if the injector has totally failed (no fuel delivery). However, a malfunctioning or partly failed injector may still be contributing fuel, and not be noticed because the engine seems to be performing normally.

He suggested I have it checked (pressure check or something like that) so I thought of having it brought to your shop. Is this correct? We can check it...

Did Toyota specifically say that the CEL was due to a faulty injector? What cylinder? What was the fault code?

Thanks a lot. You're welcome.

[OldSchoolHack]

Sir Dieseldude may I get the address of your shop in Q. Ave?

My problem is other people who drive my car complain of the lack of power when pushing from 60kmph up, as in when trying to overtake. From 60 to 80 and higher it fails to accelerate quickly. However when done in a slow manner (acceleration over a longer period of time, say more than 1 minute) it does fine. I am a slow driver so I do not experience what they complain about.

It's 2nd hand (3rd hand? maybe more) and it is a converted RHD-LHD automatic vehicle (subic most probably) Toyota Hilux Surf 2.4 EFI turbo diesel. I like it so I am treating it like a project car (meaning it is costing me too much. LOL!). TIA.

[miked]

Sir dieseldude,

what kind of oil (grade & brand also if possible) must be used on a injection pump/governor assembly? is it engine oil, gear, atf, cooking( hehe), etc?

thanks a lot.

[Dieseldude]

Sir dieseldude,

what kind of oil (grade & brand also if possible) must be used on a injection pump/governor assembly? is it engine oil, gear, atf, cooking( hehe), etc?

thanks a lot.

Same oil you use on the engine. Oil grade is not critical.

[tonbest]

sir, may i know the address of your shop,,,contact number? I'll bring my 2003 pajero fm. salamat

[Dieseldude]

sir, may i know the address of your shop,,,contact number? I'll bring my 2003 pajero fm. salamat

I will PM you.

[irmaverick]

sir dieseldude


good day po.. newbie here.. pasensya na po bout sa mga common sense na questions ko, pero curious lang po ako kung kelangan ko na po ba icalibrate yung 4d56 engine sa adventure, since it's already have a 105k mileage. 7 years na din po sa min ung sasakyan, and every 5k kms eh change oil sya. every 10k kms naman po ang palit ng mga filters nya. pero never pa nareplace yung mga belts nya (except for the timing belt). i don't know if it's my driving, pero pansin ko na parang malakas na ata sya magconsume ng krudo.

and is it possible to install an intercooler sa adventure, or delikado po sya kung gagawin yun?? if ever na magpapacalibrate po ako, sa shop po ninyo sana ako pupunta. mukhang forte nyo na po mga diesel engines eh, so sa inyo po ako magpapachekup. san po ang location nyo?? thanks po in advance...

[Dieseldude]

good day po.. newbie here.. pasensya na po bout sa mga common sense na questions ko, pero curious lang po ako kung kelangan ko na po ba icalibrate yung 4d56 engine sa adventure, since it's already have a 105k mileage. 7 years na din po sa min ung sasakyan, and every 5k kms eh change oil sya. every 10k kms naman po ang palit ng mga filters nya. Hindi kelangan icalibrate kung ok ang andar.

pero never pa nareplace yung mga belts nya (except for the timing belt). Good. Check/replace vee belts and coolant hoses as per owners manual recommendation.

i don't know if it's my driving, pero pansin ko na parang malakas na ata sya magconsume ng krudo. Siguraduhin mo muna.

and is it possible to install an intercooler sa adventure, or delikado po sya kung gagawin yun?? Wala yata turbo ang Adventure. Hindi makakatulong ang intercooler kung walang turbo.

if ever na magpapacalibrate po ako, sa shop po ninyo sana ako pupunta. mukhang forte nyo na po mga diesel engines eh, so sa inyo po ako magpapachekup. san po ang location nyo?? thanks po in advance... PM kita.

[brumie59]

Hi Dieseldude and other experts, I have an 04 D4D 2.5 Hilux in the UK, it starts and drives perfectly!, never misses a beat, but is now black smoking quite badly, even at idle, having read many posts about the D4D, the general advice would be to replace the high pressure pump, my previous experience with smoky diesels would be the pump timing, but obviously this is ecu controlled on cdri system, ....can you explain why the High pressure pump would cause black smoke? thanks for any advice

[Dieseldude]

Hi Dieseldude and other experts, I have an 04 D4D 2.5 Hilux in the UK, it starts and drives perfectly!, never misses a beat, but is now black smoking quite badly, even at idle, having read many posts about the D4D, the general advice would be to replace the high pressure pump, my previous experience with smoky diesels would be the pump timing, but obviously this is ecu controlled on cdri system, ....can you explain why the High pressure pump would cause black smoke? thanks for any advice

This is probably not a high pressure pump problem. Something else could be causing the black smoke.

[brumie59]

This is probably not a high pressure pump problem. Something else could be causing the black smoke.

Thanks for that, indeed, today I disconnected each injector in turn whilst engine running and noted rough running between each dissablement, the engine managment light came on each time as expected, then strangely enough on restarting the engine, it would appear to be running ok with no more clouds of black smoke, could i have somehow reset the ecu or something?, have driven 50 miles today and it now seems ok!!!, rgds

[brumie59]

Thanks for that, indeed, today I disconnected each injector in turn whilst engine running and noted rough running between each dissablement, the engine managment light came on each time as expected, then strangely enough on restarting the engine, it would appear to be running ok with no more clouds of black smoke, could i have somehow reset the ecu or something?, have driven 50 miles today and it now seems ok!!!, rgds

Must have been my keen imagination!, still smoking, just the same, back to the drawing board

[Dieseldude]

Must have been my keen imagination!, still smoking, just the same, back to the drawing board

Have it scanned. Check EGR.

[brumie59]

Have it scanned. Check EGR.

Thanks again, I'll do that, rgds

[rjbanzon]

good day sir, i own a gen2 jdm pajero with a 4556 Turbo intercooler engine, and for the past months i noticed that my pajero has been hard starting during cold starts even if all the glowplugs are glowing good. and the bad thing is, after it cranks to start for 15 seconds, a big grey-ish smokescreen is emitted by the exhaust. and while it runs or is in idle, my exhaust still emits this grey ish smoke that smells very unpleasant. and to add to that, my pajero has very bad fuel mileage, let's say around 5.5km/L-6km/L on city and 7-8km/l on highway. what could be the problem and how much would fixing the problem cost?

[Dieseldude]

good day sir, i own a gen2 jdm pajero with a 4556 Turbo intercooler engine, and for the past months i noticed that my pajero has been hard starting during cold starts even if all the glowplugs are glowing good. Plugs may be ok but they may not be glowing if your glow plug relay has failed.

and the bad thing is, after it cranks to start for 15 seconds, a big grey-ish smokescreen is emitted by the exhaust. This is often seen on engines which take a long time to start. This will most probably go away once your hard start problem is cured.

and while it runs or is in idle, my exhaust still emits this grey ish smoke that smells very unpleasant. and to add to that, my pajero has very bad fuel mileage, let's say around 5.5km/L-6km/L on city and 7-8km/l on highway. what could be the problem and how much would fixing the problem cost?

[rjbanzon]

sir, how about the bad mileage? would it mean i'd have to calibrate as well?

[Dieseldude]

sir, how about the bad mileage? would it mean i'd have to calibrate as well?

Replace air filter first before considering calibration. Try original Mits filter.

Pump calibration will only assure you of correct fueling. It is not the sole cure for bad mileage though. Poor fuel consumption can be due to a lot of variables.