Diesel Fuel Injection System Help Desk

[Ry_Tower]

hi diesel dude, I have a problem with my toyota fortuner 3.0 automatic. Hope you can help me. The problem is that, when starting from a stop position and you start to rev the engine, walang hatak, usually takes about 2 second for the fortuner to move forward. However, while on the move na, wala namang problema, malakas humatak at malakas ang hataw. The only problem is yun nga, pag from a stop positiion. You can hear the engine rev pero ayaw umandar, only after mga 2 second bago aandar yung fortuner. .... my fortuner is casa maintained so regular ako nag papa service, every 5k. When I brought my fortuner to the casa, medyo parang trial and error ang gagawin nila, sabi nila, change muna suction control valve, then pag di parin gumana papalitan na raw yung mga fuel injector.

Hope you can help.. thanks in advance.

Dapat pati yung EGR mo ipa-check din kung stuck-up na.

[marz]

Sorry, I can't give you a definite answer. You may be right though about a short circuit to ground on the fuel filter's water sensor. We've done a lot of Pregios but have never seen this problem.

Sir thank you sa reply. Na trace ko na problem its the water sensor, GROUNDED

[Dieseldude]

Sir thank you sa reply. Na trace ko na problem its the water sensor, GROUNDED

Good job. Congratulations!

[crazy_boy]

sir, how do i de-carbonize a diesel intake manifold? sorry if this is OT. just thinking that black smoke may also be coming from carbon gunk-filled intake manifold.

[duskylim]

Hi Sir Dieseldude:

I have noticed that every morning before I start up - I have to bleed the fuel system of a very small amount of air that seems to be constantly present.

I have checked very carefully for leaks and have replaced all the fuel lines and connections but that tiny amount of air still seems to be present.

Now, if there was a serious leak, the engine should run erratically and display all the problems associated with it.

Also, it would not be able to run with power and accelerate smoothly - however, it can do both, again there doesn't seem to be a significant leak.

Lately I noticed that when filling up with diesel, there was a lot of air bubbles in the fuel they pumped.

It seems to me that some of that air gets dissolved into the diesel fuel and then when it experiences lower flow rates and lower pressure in the fuel filter assembly (with the hand pump) it tends to accumulate there - so I have to bleed it out in the morning.

I saw on the internet adds for the so-called FASS (fuel-air-separation system) that is supposed to remove air from diesel fuel systems.

Its rather expensive - from US$550-750, do you think it's worth it?

Thanks a bunch in advance,

Dusky Lim

[Dieseldude]

sir, how do i de-carbonize a diesel intake manifold? sorry if this is OT. just thinking that black smoke may also be coming from carbon gunk-filled intake manifold.

Best way to decarbonize is to run your engine at high speed and load every once in a while. The higher exhaust temperature fries accumulated soot in the exhaust system; and the higher exhaust volume blows it out.

[crazy_boy]

Best way to decarbonize is to run your engine at high speed and load every once in a while. The higher exhaust temperature fries accumulated soot in the exhaust system; and the higher exhaust volume blows it out.

sir how about the intake manifold? will driving it hard clean the intake manifold as well? there's carbon gunk in my intake manifold because of the accumulated oil from my intercooler hoses. i will install an oil catch can to minimize it but i think i have to clean my intercooler and manifold first.

[Dieseldude]

sir how about the intake manifold? will driving it hard clean the intake manifold as well? No it will not.

there's carbon gunk in my intake manifold because of the accumulated oil from my intercooler hoses. This is normal. Oil comes from engine blowby gasses and from turbo.

i will install an oil catch can to minimize it but i think i have to clean my intercooler and manifold first. I don't think this is necessary.

[crazy_boy]

sir how about the intake manifold? will driving it hard clean the intake manifold as well? No it will not.

there's carbon gunk in my intake manifold because of the accumulated oil from my intercooler hoses. This is normal. Oil comes from engine blowby gasses and from turbo.

i will install an oil catch can to minimize it but i think i have to clean my intercooler and manifold first. I don't think this is necessary.

thank you sir!

[Dieseldude]

Hi Sir Dieseldude:

I have noticed that every morning before I start up - I have to bleed the fuel system of a very small amount of air that seems to be constantly present. The injection system has an overflow/air bleed valve to take care of minor ingress of air. Excessive air ingress should however be corrected as it will affect engine performance.

I have checked very carefully for leaks and have replaced all the fuel lines and connections but that tiny amount of air still seems to be present. Install a temporary transparent hose between the fuel tank pipe and fuel filter, and another between the filter and injection pump. Watch for air bubbles on these two hoses while the engine is running.

Now, if there was a serious leak, the engine should run erratically and display all the problems associated with it. You are right.

Also, it would not be able to run with power and accelerate smoothly - however, it can do both, again there doesn't seem to be a significant leak. Your car is fine then.

Lately I noticed that when filling up with diesel, there was a lot of air bubbles in the fuel they pumped. You might be paying for air????

It seems to me that some of that air gets dissolved into the diesel fuel and then when it experiences lower flow rates and lower pressure in the fuel filter assembly (with the hand pump) it tends to accumulate there - so I have to bleed it out in the morning. You don't have to bleed your system if your engine runs fine.

I saw on the internet adds for the so-called FASS (fuel-air-separation system) that is supposed to remove air from diesel fuel systems. Its rather expensive - from US$550-750, do you think it's worth it? I don't think so.

Thanks a bunch in advance, You're welcome.

Dusky Lim

[crazy_boy]

sir, dieseldude, im just wondering, to further protect my injectors, can i install an inline filter like this:

im thinking of placing it in between the fuel filter and the injection pump. the filter above is from a Merc 300D.

[Dieseldude]

sir, dieseldude, im just wondering, to further protect my injectors, can i install an inline filter like this: You can, but it won't protect your injectors. This has a coarse screen which is only supposed to filter large dirt particles and protect the feed pump.

im thinking of placing it in between the fuel filter and the injection pump. Placing it in series with the fuel filter won't do any good as the fuel filter uses a fine filter media. The feed pump pulls fuel from the fuel tank through this coarse inline strainer, and pumps fuel to the injection pump through the fine fuel filter.

the filter above is from a Merc 300D. Yes, we often see these old reliable mercs.

[jowel]

DD,
Help naman po....We bought flooded Innova 2.5L E A/T, so we cleaned everything replaced all electronics item.....

The question is on the testing itself we're trying to start the engine and we can't start it its broommmm then stop. start again same thing brooommmm then stop...


What seems to be the problem sir DD did we miss something????Hope you can help us on this....

Tia

[Dieseldude]

DD,
Help naman po....We bought flooded Innova 2.5L E A/T, so we cleaned everything replaced all electronics item.....

The question is on the testing itself we're trying to start the engine and we can't start it its broommmm then stop. start again same thing brooommmm then stop...


What seems to be the problem sir DD did we miss something????Hope you can help us on this....

Tia

I would like to help you, but there are a lot of possible faults that prevents an engine start. Your first step is to have this vehicle scanned. You have to to this as this is the correct troubleshooting procedure.

[blazeken]

maraming salamat sir dieseldude sa reply!

sinabi ko na din dati sa service adviser na baka sa sensor ng pedal ang problem pero snob nya lang ako... pagpunta ko uli sa ibang service sasabihin ko..

hindi ko alam anong tawag sa unit na yun hehe pinakita lang kasi sakin na normal yung ganun na measure..

update ko kayo pag nadala ko na... thanks again sir!

Hello! just a newbie here. Puede po malaman kung ano naging solution sa problem na to?I just got a new 4x2 GLS-v and it's onyl arournf 1400km. and I'm also experiencing the same problem. Thank you po!

[Dieseldude]

Hello! just a newbie here. Puede po malaman kung ano naging solution sa problem na to?I just got a new 4x2 GLS-v and it's onyl arournf 1400km. and I'm also experiencing the same problem. Thank you po!

Can't recall JJGF's post. But this should be no problem as your car is within warranty.

[blazeken]

maraming salamat sir dieseldude sa reply!

sinabi ko na din dati sa service adviser na baka sa sensor ng pedal ang problem pero snob nya lang ako... pagpunta ko uli sa ibang service sasabihin ko..

hindi ko alam anong tawag sa unit na yun hehe pinakita lang kasi sakin na normal yung ganun na measure..

update ko kayo pag nadala ko na... thanks again sir!

Can't recall JJGF's post. But this should be no problem as your car is within warranty.

Thank you for the reply Sir. Actually this my first Diesel ride and am very much disappointed considering this is new and i'm already having problem with the engine...Do you think it's a big issue? I hope JJGF could read this and can make some advice.

[Dieseldude]

Thank you for the reply Sir. Actually this my first Diesel ride and am very much disappointed considering this is new and i'm already having problem with the engine...Do you think it's a big issue? I hope JJGF could read this and can make some advice.

I don't know if it's an issue as I don't know your car. What seems to be the problem?
What did your dealer have to say about your complaint?

[isketi]

Sir Dieseldude, you've got PM.

[laronde]

need help po with my L300FB i cant
start it eh, nagcracrank naman siya.
already replaced the fuel filter,
cleaned the air filter too, napaltan na
rin battery but still ayaw parin
magstart. is it possible that there is a
problem with fuel injection ayaw kc
magpump ung fuel filter