Diesel Fuel Injection System Help Desk

[Dieseldude]

Hi sir Diesel Dude,
Was able to buy a surplus TPS in Banawe and had it installed at casa, car is now running fine. Casa people erased the DTC pertaining to the malfunctioning TPS. Indeed, the TPS was already at fault, the neck of the vane/propeller like thing inside the TPS was already broken in two. I was not able to get the parts number of the IP, but noted that it was from Bosch. TY for your help anyway and more power to you.....

I'm glad you were able to find a TPS though used.

[genesis2013]

Hi,

I'm new on this thread and I have the same problem with my isuzu fuego 2000 model.

[genesis2013]

Hi,

I'm new to this thread. I'm a 2nd owner of 2000 fuego (4ja1) which experienced similar problems for years now. No matter how new is my fuel filter and cleaned-up tank, still the problem of low power keeps coming back after all this replacing of filter and tank cleaning. But at first it runs well but after days there seems to be low pressure when starting up, but when the engine becomes heated the engine runs well. I noticed the hand feed pump has excessive air accumulation days after being bleeding out the air. I went to 2 auto mechanics and they advised to replace the hand pump since it is still original and there seems to be a vacuum since the pump returns to the original position when the inlet is covered during pumping. We tried to replace with a replacement part only but the problem becomes worse since they engine stalls when revved up upto 3000 rpm or when running. So we restore the old feed pump since it is very risky to travel with the replacement part. The engine runs when bleeding out the air but the air accumulates again after days. I am planning to bu an original hand pump as advised by the mechanic. Maybe you have better opinion on this. Thanks a lot.

[kompressor]

Hi,

I'm new to this thread. I'm a 2nd owner of 2000 fuego (4ja1) which experienced similar problems for years now. No matter how new is my fuel filter and cleaned-up tank, still the problem of low power keeps coming back after all this replacing of filter and tank cleaning. But at first it runs well but after days there seems to be low pressure when starting up, but when the engine becomes heated the engine runs well. I noticed the hand feed pump has excessive air accumulation days after being bleeding out the air. I went to 2 auto mechanics and they advised to replace the hand pump since it is still original and there seems to be a vacuum since the pump returns to the original position when the inlet is covered during pumping. We tried to replace with a replacement part only but the problem becomes worse since they engine stalls when revved up upto 3000 rpm or when running. So we restore the old feed pump since it is very risky to travel with the replacement part. The engine runs when bleeding out the air but the air accumulates again after days. I am planning to bu an original hand pump as advised by the mechanic. Maybe you have better opinion on this. Thanks a lot.

I also had that problem way before. The el-cheapo feeder pump will not do the job (bought one at P350 and worked for a month then started getting air thereafter) so I ended up buying an original part (albeit korean) and it has solved the problem for me. More than double yung presyo ng original part but better than buying an el cheapo replacement that will always be a gamble (just like what happened to me).

[genesis2013]

Sir,

I have the same problem with my fuego but my replacement hand pump did not work well as it keeps stalling the engine. So i reconnected the old hand pump. DO i need to buy the original hand feed pump?

[genesis2013]

Sir,

How much is the cost of the original hand feed pump?

[genesis2013]

Sir,

How much is the cost of the original hand feed pump?

[kompressor]

Not sure for a 4JA1 kasi paired ang gamit niyan with the water separator na kasama ng feeder pump and the fuel filter beside it. Pang 4D56 kasi yung sa akin so yung pang starex ang pinalit ko where the OEM korean cost me P750 for the entire assembly in Blumentritt (includes feeder pump, fuel filter and water separator sa ilalim).

[eajrapogi]

sir ask ko lang po.
if nagpalit po ng engine & transmission, need po ba ireset ang ecu? or marereset na po automatically kasi natangal yung battery?

toyota hilux surf po tsikot q ang engine q po 2l-te. problem ko po kasi is that new engine na po ako pero naka limit po at 60kph ang speed ko po.
sabi po ng mechaniko ko po ay baka computer box na po ang problem. pero a friend of mine told me also that if computer box ang may problema hindi ko po mapapaandar ang sasakyan literally. kaya medyo nacoconfuse po ako.
hope matulungan niyo po ako. maraming salamat po.

[Dieseldude]

sir ask ko lang po.
if nagpalit po ng engine & transmission, need po ba ireset ang ecu? or marereset na po automatically kasi natangal yung battery? Hindi narereset ang ecu nyan. Walang problem basta exactly the same yung engine ipinalit mo sa dati. Mabubura ang historic faults kung i-disconnect mo ang battery.

toyota hilux surf po tsikot q ang engine q po 2l-te. problem ko po kasi is that new engine na po ako pero naka limit po at 60kph ang speed ko po.
sabi po ng mechaniko ko po ay baka computer box na po ang problem. Computer box ang madalas na tinuturo ng mga mekaniko kung di na nila matukoy ang real problem.

pero a friend of mine told me also that if computer box ang may problema hindi ko po mapapaandar ang sasakyan literally. Not true. Hindi aandar kung totally dead ang ecu. Madalas meron sectional damage ang ecu. Pwede pa ito maka paandar, pero meron fault/problem, like low power. Baka meron sensor problem, bad wiring harness, barado filters, atbp.

kaya medyo nacoconfuse po ako. hope matulungan niyo po ako. maraming salamat po. Hindi yan magagawa ng ordinary mechanic. Mechanic with good electronic diagnistic skills ang kelangan......Good luck..

[eajrapogi]

Sir dieseldude, thanks for the response.. yup tama po kayo low power po ang sasakyan. 60kph max lang po takbo ko. tapos i tried to run some diagnosis, ang napansin ko po is that yung rpm ko hindi sensitive like halfway press na ang throttle pero 2000rpm palang ang reading ko and pag fully depressed na ang throttle about 5-10sec dun palang magiincrease from 2000rpm up. tingin ko rin na sensor problem kasi delay ang response niya but im not that sure.

Also ask ko lang, regarding sa sectional damage ng ecu? is it on the ecu itself or sa mga input and output devices ang cause?

Many thanks to you Sir

[Dieseldude]

Sir dieseldude, thanks for the response.. yup tama po kayo low power po ang sasakyan. 60kph max lang po takbo ko. tapos i tried to run some diagnosis, ang napansin ko po is that yung rpm ko hindi sensitive like halfway press na ang throttle pero 2000rpm palang ang reading ko and pag fully depressed na ang throttle about 5-10sec dun palang magiincrease from 2000rpm up. tingin ko rin na sensor problem kasi delay ang response niya but im not that sure.

Also ask ko lang, regarding sa sectional damage ng ecu? is it on the ecu itself or sa mga input and output devices ang cause? It can be on any part of the ecu....depends on what part was electronically damaged. It can also be external to the ecu, like a broken wire connection to a sensor or actuator.

Low power could be caused by a restricted fuel and/or air filter, or a bad/wrong vacuum line routings.......so many things to check.

Question.....why did you replace your engine?

Did low power occur after the change engine?



Many thanks to you Sir

[eajrapogi]

Low power could be caused by a restricted fuel and/or air filter, or a bad/wrong vacuum line routings.......so many things to check. sir can you enumerate all the things that should be checked so that i can perform a diagnostic checks on those areas. I have also speculated the vacuum line routings kasi parang nahihirapan huminga ang sasakyan, though newly changed na air flter. i haven't checked the fuel pressure,so try ko icheck muna yun.

Question.....why did you replace your engine? i replace the whole engine and transmission for convenience kasi yung old engine almost battered na from the past 11yrs na rin kasi naamin itong hilux and pamana lang ni erpats, e ayaw ibenta kaya ganon nalang naging strategy also nakaroon ng mechanic error nangatok po ang engine,

Did low power occur after the change engine? low power was already present from the past engine same scenario 60kph pa rin.Kaya ako nalang po muna nagpeperform nang mga diagnostic check to lessen the expenses, also for self-learning na rin po.


Hope matulungan and maguide niyo po ako.

Thank you and More Power

[Dieseldude]

Low power could be caused by a restricted fuel and/or air filter, or a bad/wrong vacuum line routings.......so many things to check.[/COLOR] sir can you enumerate all the things that should be checked so that i can perform a diagnostic checks on those areas. I have also speculated the vacuum line routings kasi parang nahihirapan huminga ang sasakyan, though newly changed na air flter. i haven't checked the fuel pressure,so try ko icheck muna yun. I cannot list down all things to check........too many...... I suggest you visit a qualified workshop.

Question.....why did you replace your engine? i replace the whole engine and transmission for convenience kasi yung old engine almost battered na from the past 11yrs na rin kasi naamin itong hilux and pamana lang ni erpats, e ayaw ibenta kaya ganon nalang naging strategy also nakaroon ng mechanic error nangatok po ang engine,

Did low power occur after the change engine? low power was already present from the past engine same scenario 60kph pa rin.Kaya ako nalang po muna nagpeperform nang mga diagnostic check to lessen the expenses, also for self-learning na rin po. Check pedal position sensor. It might not be going to 100% at wide open throttle...


Hope matulungan and maguide niyo po ako.

Thank you and More Power :bowako

[eajrapogi]

ok sir i'll check the pedal sensor tomorrow. sir regarding bad/wrong vacuum line routings. how to check if they are not the proper routings? also can you show me their proper location/place? Thank you Sir dieseldude.

oh also the last time I last have it checked. they tried to lift the car and had it free run and ok naman yung takbo 140kph. but when put onto ground there 60kph lang.

[POPPIX]

Sir DD,

Ano po ang purpose nung dalawang oring ng injector sleeve ng 4jx1 (taas at baba)?

Ano din po ba ang dhilan ng pagtaas o pagdami ng langis sa oil sump?


Salamat po,


POPPIX

[Dieseldude]

]Sir DD,

Ano po ang purpose nung dalawang oring ng injector sleeve ng 4jx1 (taas at baba)? Two orings on the injector sleeve prevents fuel from leaking. Fuel will dilute crankcase oil if upper oring is bad.

Ano din po ba ang dhilan ng pagtaas o pagdami ng langis sa oil sump?
1) Injectors with internal leakage
2) Bad injector oring
3) Bad injector sleeve orings

From experience, some used injectors which seem to perform well on an engine may be leaking internally and cause dilution of crankcase oil.



Salamat po, You're welcome...


POPPIX

[POPPIX]

]Sir DD,

Ano po ang purpose nung dalawang oring ng injector sleeve ng 4jx1 (taas at baba)? Two orings on the injector sleeve prevents fuel from leaking. Fuel will dilute crankcase oil if upper oring is bad.

Ano din po ba ang dhilan ng pagtaas o pagdami ng langis sa oil sump?
1) Injectors with internal leakage
2) Bad injector oring
3) Bad injector sleeve orings

From experience, some used injectors which seem to perform well on an engine may be leaking internally and cause dilution of crankcase oil.



Salamat po, You're welcome...


POPPIX

Sir DD,


May paraan po ba na malaman kung walang internal leak ang injector bago ikabit?

Yung mga sinasabi po b nilang modified ung 56k pataas ang serial no. e ng kakaron din ng internal leak?


Pwede po kaya na madaan pa sa linis ang injector baka kasi napuno lng ng carbon yung nozzle ng injector?


Pwede din po kaya na pag palitin ng internal parts ung mga injector para mabuo kung solenoid lang ang sira ng isa at yung isa naman ay yung oring sa loob?


Salamat po ulit,


POPPIX

[Dieseldude]

Sir DD,

May paraan po ba na malaman kung walang internal leak ang injector bago ikabit? Walang paraan.

Yung mga sinasabi po b nilang modified ung 56k pataas ang serial no. e ng kakaron din ng internal leak? Hindi ko alam. Pero sa palagay ko, less prone to internal leakage ang upgraded injectors. Inupgrade ito ng Isuzu para ma correct yung problem.


Pwede po kaya na madaan pa sa linis ang injector baka kasi napuno lng ng carbon yung nozzle ng injector? Pwede linisin kung madumi lang. Hindi maayos sa linis kung meron damage ang internal parts.

Pwede din po kaya na pag palitin ng internal parts ung mga injector para mabuo kung solenoid lang ang sira ng isa at yung isa naman ay yung oring sa loob? Hindi pwede pagpalitin ang internal parts dahil matched ito lahat; magbabago ang injector performance.


Salamat po ulit,


POPPIX

[ollopasagla]

Sir DD,

Normal ba na may lumalabas na kaunting usok galing sa compressor outlet ng turbo papunta sa intercooler?
2.8 jdm pajero 98, AT, 4m40 engine.

Salamat ng marami,

Ollopasagla