Diesel Fuel Injection System Help Desk

**Dieseldude** · October 6th, 2007 03:45 PM

Originally Posted by Hibiki

Stock Isuzu 96 LS 4JA1 Pump. I would like to have it checked kasi mine is using the stock alternator (40amps). I noticed that when the engine is on operating temp, the idle seems unstable. Parang kinakapos. I was thinking that kasi the pump is really old, maybe the wirings or output voltage is no longer in specs.

Thanks Dieseldude

The throttle potentiometer does not have any effect on the injection pump's performance. It is mounted on top of the pump's throttle shaft to monitor throttle position for EGR (Exhaust gas recirculation) control and/or automatic transmission shift control.

Blocked fuel filter maybe? Or you may have an injection problem as you car is 11 years old, probably with high mileage as well.

Bye,

Dieseldude

**Dieseldude** · October 6th, 2007 04:07 PM

Originally Posted by cordi

Hi Dieseldude.

We have a crdi Starex that happens to consume fuel excessively (about 4km city, 8km highway).

I have already changed oil and oil, fuel and air filters but there seems to be minimal difference.

Do you have equipment that can calibrate the fuel system to a better condition? Do you also have obd for the van?

Thanks!

As I previously stated on our help desk, fuel consumption depends on so many factors. See my previous postings. Your authorized Hyundai agent can give you some figures on your question.

What is your present mileage? Does your CRDI emit a lot of black smoke?

Oil change will have no significant effect on fuel consumption. A non-original air filter could restrict air to your engine at higher rpms and result in high fuel use.

Yes, we can calibrate your CR pump. We have the equipment to do common rail pumps for Hyundais, Toyotas, etc. But before you consider calibration, I suggest that you consult your local Hyundai dealer about your problem. It is possible that you don't have any problem at all.

Bye,

Dieseldude

**zed2d** · October 6th, 2007 06:05 PM

Sir dieseldude i would just like to ask. whats the use of the 2 green wires coming out of my injector pump is it for the tachometer, and if it is how do i connect one? My engine pala is toyota 3c-t surplus. TIA

**Dieseldude** · October 6th, 2007 10:31 PM

Originally Posted by zed2d

Sir dieseldude i would just like to ask. whats the use of the 2 green wires coming out of my injector pump is it for the tachometer, and if it is how do i connect one? My engine pala is toyota 3c-t surplus. TIA

I don't have your injection pump's part number, so I can't be sure about these green wires.

But if this is an ordinary Denso VE pump, these wires would most probably be from the speed sensor on your pump. You are also probably correct in assuming that these wires are connected to your tach. You will probably see a 2-wire harness near this sensor.

Bye,

Dieseldude

**zed2d** · October 14th, 2007 02:02 PM

Sir dieseldude

Yes this wire has a harness composed of three wire in a triangular connector one of this wire controls the idle solenoid shut-off valve.
I have a follow up question what tachometer could i possibly use on these engine and also I need a guide for the wiring of this tach.
Thanks again for your reply.

**Dieseldude** · October 14th, 2007 04:41 PM

Originally Posted by zed2d

Sir dieseldude

Yes this wire has a harness composed of three wire in a triangular connector one of this wire controls the idle solenoid shut-off valve.
I have a follow up question what tachometer could i possibly use on these engine and also I need a guide for the wiring of this tach.
Thanks again for your reply.

Send me the make and part number of your injection pump. Part number will be on the pump dataplate. You may also send me a digital picture of your pump. I can research the 3-wire harness for you tomorrow from our electronic database.

I may not be able to help you on your question on the tachometer as this information is limited to the vehicle manufacturer.

What is the make and model of your engine, and it's vehicle application?
Are you doing an engine change / modification?

Bye,

Dieseldude

**cocoy** · October 28th, 2007 01:09 AM

sir just want to asked.. i recently changed the nozzle tip of my starex TCI 01 model...but the nozzle tip that we used to replace the original ones have different numbers written on the nozzle tip... the original one is numbered 130,,, and the ones we used to replce it is 112.. which is what they say is used on the L300 engines,would there be a difference... because i have notice that it doesnt seem to have the power that it used to have.. actually it can only go 120km/h now and belching black smoke.. while before i replaced the original ones running 140 was not a problem at all...the model of my engine is the D4BH turbo intercooler...thank you sir for your inputs..

**kaong** · November 4th, 2007 10:11 AM

hi.to everybody,
pasensya na po coz firts time na mag post..i have a 2000 starex and at 70/80kph speed mausok ang tambotso .automatic po .please help me naman

**Dieseldude** · November 5th, 2007 02:04 AM

Originally Posted by kaong

hi.to everybody,
pasensya na po coz firts time na mag post..i have a 2000 starex and at 70/80kph speed mausok ang tambotso .automatic po .please help me naman

Check / replace your air filter. This is the most common cause for black smoke. If you are not able to correct your problem, it is possible that your injection pump and or injectors are faulty.

Bye,

Dieseldude

**Dieseldude** · November 5th, 2007 02:30 AM

Originally Posted by cocoy

sir just want to asked.. i recently changed the nozzle tip of my starex TCI 01 model...but the nozzle tip that we used to replace the original ones have different numbers written on the nozzle tip... the original one is numbered 130,,, and the ones we used to replce it is 112.. which is what they say is used on the L300 engines,would there be a difference... because i have notice that it doesnt seem to have the power that it used to have.. actually it can only go 120km/h now and belching black smoke.. while before i replaced the original ones running 140 was not a problem at all...the model of my engine is the D4BH turbo intercooler...thank you sir for your inputs..

Hi Cocoy,

You should normally put in original ...130 nozzles as these are factory-recommended. I don't know if using ...112 nozzles has caused your problem as we haven't tried doing it this way.

I suggest that you ask the workshop which calibrated your injectors to assist you on your complaint. Workshops normally give warranty on their jobs. Did you have your injection pump calibrated too?

If they cannot help you, I would approach the problem this way:

I would check the condition of my air filter.
Recheck injection pump to engine timing
Check turbocharger boost
Check/calibrate injection pump
Replace nozzles with original ones

We can do all these but it will cost you. So I suggest that you first seek help from the workshop which originally repaired your fuel ijection system.

Bye,

Dieseldude