Diesel Fuel Injection System Help Desk

[Dieseldude]

Isa sa mga trucks na ginagawa sa shop ni Sir Jake, madalas ang Cummins but this Freightliner with a C12 CAT is seldom.

Ang gwapo naman nung truck, este yung driver pala.

[4JGtootsie]

Ang gwapo naman nung truck, este yung driver pala.

Ewan ko biglang lumabas na lang sa picture. Biglang sumusulpot nalang sa work area at calibration room parang multo. Baka misguided soul.

[rotber]

My tire size is 9.5 x 30 R15 Bridgeton AT. Are these the recommended tires for your ride? Eto kc reg. tire size ng 4x4.

Last April 27, 2008 I went to Bustos Bulacan. I am from Valenzuela, I traveled 90 kms. back to back but I consumed 12.5 liters of diesel. My hi way speed is only 80 kph, 90-100 kph on overtaking then back to 80 kph. I have only 2 passenger and about 50 kilograms load, aircon temp setting at 60%.

I regularly change oil filter every change oil. I changed the fuel filter & the air filter w/ simota. Though I've often seen Simota on this site, I don't really know what it is. Are these good filters? Are you sure that your Simota air filter is matched to your engine, and isn't restricting air to your engine? Eto ung air filter ng mga race engine. Other thread when they used simota nag improve milage kaya lang mainagay.

I feel my engine is hard to full specially on up hill at full stop. my garage 1-1/2 ft. deep from the road. When I back up to go out I felt its getting hard to get up. Check injection pump to engine timing. Brakes not sticking? ok naman brakes. Posible ba magbago timing maski wala gulalaw? Saan ba shop ok na mag check ng timing, pwede ba sa inyo?
My engine was a Japan surplus used from Nissan Urvan & Frontier. Sa palagay k Virgin pa nga injection pump. Posible ba dahilan pag mahina na pressure ng injection pump? Parang ganun kc feel ko. Ung kc Frontier ng hipag ko lakas humatak at mahina sa diesel.

Originaly my ride was Z20 petrol engine manual trans w/ 4.88 differential, tire size 215 x 70 R15.

I read in the other thread that this type of engine consumed about 10-12 km/l on Hi way and 8-9 km/l on City. This is possible. I really hope you can improve your fuel consumption.

Thanks again dieseldude for your comments. You're welcome....

Thanks ulit.

[Dieseldude]

Thanks ulit.

Simota may be good. But if you installed an undersized filter, it will restrict air to your engine. Replacement air filers should be matched to the engine to allow sufficient air flow at full load and speed.

A good 2nd hand engine would often have a good injection pump on it too. Injection pump timing of a used engine doesn't normally deviate from specs; not unless it has been tampered with.

If you replaced your engine, you may have a transmission-to-differential gear ratio mismatch. I hope not!!!!

[xenon]

sir dieseldude, ask ko lng poh why i feel this lack of power s arangkada para bng hindi kapit yung clutch ko. i replaced my clutch n pressureplate pro parang ganun pdin. Sayang naman ang ginastos mo sa clutch and pressure plate kung wala pala dun ang problema.ok lng din nman poh sir kasi mdyo may sunog ndin yung clutch and pressure plate.

di ako kontento sa hatak nya. Malakas ba dati ang hatak nya? Meroon bang ginawa sa starex mo bago humina ang hatak? May gumalaw na ba ng injection pump mo?wala p ho gumagalaw ng injection kop sir still original pa poh!

my ride is 2003 starex.sa sctex nman npapatakbo ko sya ng 160km. Sa arangkada lng parang kulang kapit. sabi nman mekaniko ko ok nman dw injection ko ksi sa andar plng dwe ng makina e very smooth nman daw. Not necessarily. yun nga poh sir di po kaya s injection pump ito?minsan kasi pag nka segunda ko parang kinakapos minsan pag naalangan di makaya ng segunda khit level road need kp ifloordown accelerator if not bka mamatay makina or kya shift knlng s 1st gear wc i know n dapat kaya din s 2nd gear.hirap explain sir.basta po feeling ko parang di ganung kapit ang clutch ko s arangkada.malalaman ho ba sa diagnosis ng injection ito?pano yun sir?tenks poh!

what do you think poh kaya problem? Hindi ko pa alam. Sagutin mo kaya muna ang mga tanong ko.

tenks po in advance!it will be a lot of help kasi gusto ko tlaga lumakas arangkada ride ko. Baka barado air and/or fuel filter/s mo?

bago po nga pala airfilter ko wc is parati ko sinasabay every 5k changeoil and 10k sa fuel filter nman sir.ty

[Dieseldude]

bago po nga pala airfilter ko wc is parati ko sinasabay every 5k changeoil and 10k sa fuel filter nman sir.ty

Causes of low engine power are insufficient air and/or insufficient fuel.

You may have to bring your van to a good diesel workshop which can conduct a thorough check on your air intake system, and/or fuel injection system if necessary.

Siguradong maaayos yan.

Bye,

[ricmacho]

Sorry. Hindi ko alam kung ano ang RF turbo. Is this an engine?

Bakit kailangan ipa wiring ang turbo mo? Electronically controlled ba ito?

sir yong pong RF ay mazda 2.0 diesel engine. may roon po kasing mga 2 vacuum valve(electrically controlled )na nakakabit sa turbo.actually hindi turbo tawag . pressure wave charger ang pangalan . nakakabit ito sa mazda capella. sir ty sa reply.
ric c.

[Dieseldude]

sir yong pong RF ay mazda 2.0 diesel engine. may roon po kasing mga 2 vacuum valve(electrically controlled )na nakakabit sa turbo.actually hindi turbo tawag . pressure wave charger ang pangalan . nakakabit ito sa mazda capella. sir ty sa reply.
ric c.

Hindi pa ako nakakita ng Mazda RF engine. Malalaman natin ang function ng vacuum valves pag nakita ko ang engine.

Advise ko lang sayo; wag mo kabitan ng 12V ang electric vacuum valves. Baka masira ito.

Bye

[rotber]

Simota may be good. But if you installed an undersized filter, it will restrict air to your engine. Replacement air filers should be matched to the engine to allow sufficient air flow at full load and speed.

A good 2nd hand engine would often have a good injection pump on it too. Injection pump timing of a used engine doesn't normally deviate from specs; not unless it has been tampered with.

If you replaced your engine, you may have a transmission-to-differential gear ratio mismatch. I hope not!!!!

It maybe a mismatch trans to diff gear ration bcoz when I travel around 120 kph my engine seems in high rev (my tachometer not functioning). As par as I know other nissan pick up of this type had a 4.375:1 diff. gear ration while mine is 4.888:1. Is it a big difference on fuel consumption? But I think if I had a low speed gear ratio I will not feel difficulty in pulling specially on 1st gear on up hill. What do you think sir?

Thanks again.

[Dieseldude]

It maybe a mismatch trans to diff gear ration bcoz when I travel around 120 kph my engine seems in high rev (my tachometer not functioning). This looks like a mismatch.

As far as I know other nissan pick up of this type had a 4.375:1 diff. gear ration while mine is 4.888:1. Is it a big difference on fuel consumption? Yes, this will affect fuel consumption.

But I think if I had a low speed gear ratio I will not feel difficulty in pulling specially on 1st gear on up hill. You are correct.

What do you think sir? You may have a low power problem on your engine as well; insufficient air or insufficient fuel. This has to be checked.

Thanks again. You're welcome....

[rotber]

Sir Dieseldude,

Is there any instrument to test the pressure delivery of injection pump without removing from the engine? Can we put the test instrument and run the engine so that we can determine if the pressure is still in the manufacturers spec?

Thanks again sir.

[Dieseldude]

Sir Dieseldude,

Is there any instrument to test the pressure delivery of injection pump without removing from the engine? Can we put the test instrument and run the engine so that we can determine if the pressure is still in the manufacturers spec?

Thanks again sir.

Delivery pressure is controlled by the injectors, not the pump. What's most important is the pump's fuel output quantity and governed speed, which can only be measured through our Bosch test bench.

Btw, if you changed your engine from petrol to diesel, I would recommend that you check your fuel suction line from tank-to-pump as it may be too small. The in-tank pipe of an original petrol engine would normally be smaller than that of an original diesel fuel tank. Diesel engines have bigger diameter suction pipes than petrol engines due to the larger flow of fuel which is mostly returned back to the tank.

Your injection pump may just be starved of fuel.

Bye

[carlogt]

Sir Dieseldude my ride is a '99 hilander slx.odometer is at 82000km. got it calibrated 2 years ago. Ngayon mejo mausok na (white smoke) kahit idling lang kita mo white smoke comin out of the tailpipe. Sabi mechanic na kakilala ko ok naman daw takbo at hatak naman. mejo lang mausok tlga. And ung usok di lang pag umaga nag start so di sya cold start lang. Do you think injector tips need cleaning? san ba ok magpalinis nito? sabi din mechanic ko try ko bumili orig na airfilter kse replacement lang nlagay ko.


appreciate your help sir..

[carlogt]

good shop in alabang/taguig/makati area?

Sir Dieseldude my ride is a '99 hilander slx.odometer is at 82000km. got it calibrated 2 years ago. Ngayon mejo mausok na (white smoke) kahit idling lang kita mo white smoke comin out of the tailpipe. Sabi mechanic na kakilala ko ok naman daw takbo at hatak naman. mejo lang mausok tlga. And ung usok di lang pag umaga nag start so di sya cold start lang. Do you think injector tips need cleaning? san ba ok magpalinis nito? sabi din mechanic ko try ko bumili orig na airfilter kse replacement lang nlagay ko.


appreciate your help sir..

[Dieseldude]

Sir Dieseldude my ride is a '99 hilander slx.odometer is at 82000km. got it calibrated 2 years ago. Ngayon mejo mausok na (white smoke) kahit idling lang kita mo white smoke comin out of the tailpipe. Sabi mechanic na kakilala ko ok naman daw takbo at hatak naman. mejo lang mausok tlga. And ung usok di lang pag umaga nag start so di sya cold start lang. Do you think injector tips need cleaning? san ba ok magpalinis nito? sabi din mechanic ko try ko bumili orig na airfilter kse replacement lang nlagay ko.

appreciate your help sir

If you are sure on the condition of your engine, this problem is most probably injection pump related. Cleaning your nozzles is fine, but I don't think this will correct your white smoke concern.


Air filter replacement will not also help as your engine smokes white even at low idle. A restricted air filter will cause and engine to smoke black at high speeds when the engine demand for air is large.

[carlogt]

napansin ko lang di naman tumakaw sa diesel,mejo mausok lang na puti. if injection pump, calibration usually solves this sir?

[carlogt]

napansin ko lang di naman tumakaw sa diesel,mejo mausok lang na puti. if injection pump, calibration usually solves this sir?

[Dieseldude]

napansin ko lang di naman tumakaw sa diesel,mejo mausok lang na puti. if injection pump, calibration usually solves this sir?

White smoke could be caused by the following:

1. incorrect injection pump to engine timing
2. faulty fuel injection system
3. faulty engine

If your engine is worn, calibrating the injection pump will not cure your problem.

[dcarin14]

Sir Dieseldude, ask ko lang if you will recommend any additive like Liqui Moly for example as injector cleaner? performance additive?

If yes, any other brand that you will also recommend? My ride is Pajero FM 4m40. This may be overkill but if doesnt't hurt the engine but additional help for performnace at dahil na rin sa condition ng road at diesel fuel sa Phils, I will go for it.

Appreciate your input.

[dcarin14]

Sir Dieseldude, ask ko lang if you will recommend any additive like Liqui Moly for example as injector cleaner? performance additive?

If yes, any other brand that you will also recommend? My ride is Pajero FM 4m40. This may be overkill but if doesnt't hurt the engine but additional help for performnace at dahil na rin sa condition ng road at diesel fuel sa Phils, I will go for it.

Appreciate your input.