Diesel Fuel Injection System Help Desk

[mojics]

Sir dieseldude,

Follow up lang po for my post above. Just had the injection pump of my 4d56 (L300) overhauled and calibrated. All gaskets and o-rings of the pump were replaced and the pump was calibrated.

However, naging hard starting na siya, it would take 2 to 3 tries before siya magstart whereas dati naman ay one click lang ay start na agad. Bakit kaya? Check timing, glow system, air ingress, etc. There are so many causes for a hard start problem. The workshop that serviced your IP should correct this problem.

Didn't notice this when i was still in the calibration shop, just though I would inquire first with you before I bring it back to the shop.

My 1993 L300 VV diesel has around 113,000km on its odo and according to the mechanic is due already for a complete overhaul because its temp rises during long climbs and when stuck in traffic
Temp rise alone does not justify an overhaul. Check accuracy of temp gage, check thermostat, water pump, radiator, etc.

and there is this weird "tak-tak-tak" like sound coming from the engine. This could be fuel knock due to a faulty injector nozzle. Ask around for a 2nd/3rd opinion before considering an overhaul.

Any input would be greatly appreciated.

Thanks!

thank you sir!. Btw, forgot to mention that this was top overhauled last year and may nakita ng ridge on all four cylinder liners. Could this be the culprit on why it is overheating and that strange sound?

[Dieseldude]

thank you sir!. Btw, forgot to mention that this was top overhauled last year and may nakita ng ridge on all four cylinder liners. Could this be the culprit on why it is overheating and that strange sound?

Cylinder wear will result in high blowby, not overheating.

Loosen one high pressure line at a time to validate if a specific injector is causing the knocking sound.

[mojics]

Cylinder wear will result in high blowby, not overheating.

Loosen one high pressure line at a time to validate if a specific injector is causing the knocking sound.

Thank you Sir for your valuable inputs! God bless and more power to you

[erick_214]

Hi Dieseldude,

Tanong ko lang sana kung paano ba i-adjust yung idle ng 1KZ-TE na engine bukod doon sa parang set screw na may stopper na nakakabit sa throttle body?

TIA...

[Dieseldude]

Hi Dieseldude,

Tanong ko lang sana kung paano ba i-adjust yung idle ng 1KZ-TE na engine bukod doon sa parang set screw na may stopper na nakakabit sa throttle body?

TIA...

Hindi pwede i-adjust ang idle rpm ng 1KZ-TE. Naka preset na yan sa ecu.

[erick_214]

Hindi pwede i-adjust ang idle rpm ng 1KZ-TE. Naka preset na yan sa ecu.

Hi Dieseldude,

Thanks for your reply. Wala bang parang BISS screww yung 1KZ-TE na engine na gaya sa 4G92 ng Mitsu? What about yung idle up para sa aircon, may adjustment kaya yun?

Tsaka nga pala, I now rarely use my van, napansin ko na twing gagamitin ko eh may black smoke pagka-start nya,. Mayroon kaya nagdedeteriorate sa engine pag matagal nang hindi ginagamit. Ang ginagawa ko kasi pag hindi nagagamit ay pinapaandar ko naman ng every week ng mga 15mins. Doon lang naman siya sa unang start may usok after nun habang umiinit may parang konting black smoke na lumalabas, yung tipong hindi mapapansin ko hindi pagmamasdan yung tailpipe. Does it mean na marami ang pasok ng diesel? Normal lang ba ito or do I have something to worry about?

Thanks again...

[Dieseldude]

Hi Dieseldude,

Thanks for your reply. Wala bang parang BISS screww yung 1KZ-TE na engine na gaya sa 4G92 ng Mitsu? Di ko alam kung ano yung BISS screw.

What about yung idle up para sa aircon, may adjustment kaya yun? Gagana ang idle-up kung tama ang setup ng idle.

Tsaka nga pala, I now rarely use my van, napansin ko na twing gagamitin ko eh may black smoke pagka-start nya,. Mayroon kaya nagdedeteriorate sa engine pag matagal nang hindi ginagamit.
Ang ginagawa ko kasi pag hindi nagagamit ay pinapaandar ko naman ng every week ng mga 15mins. Doon lang naman siya sa unang start may usok after nun habang umiinit may parang konting black smoke na lumalabas, yung tipong hindi mapapansin ko hindi pagmamasdan yung tailpipe. Does it mean na marami ang pasok ng diesel? Normal lang ba ito or do I have something to worry about? Normal yan.

Thanks again...

[kompressor]

Hi Dieseldude,

Thanks for your reply. Wala bang parang BISS screww yung 1KZ-TE na engine na gaya sa 4G92 ng Mitsu? What about yung idle up para sa aircon, may adjustment kaya yun?

Tsaka nga pala, I now rarely use my van, napansin ko na twing gagamitin ko eh may black smoke pagka-start nya,. Mayroon kaya nagdedeteriorate sa engine pag matagal nang hindi ginagamit. Ang ginagawa ko kasi pag hindi nagagamit ay pinapaandar ko naman ng every week ng mga 15mins. Doon lang naman siya sa unang start may usok after nun habang umiinit may parang konting black smoke na lumalabas, yung tipong hindi mapapansin ko hindi pagmamasdan yung tailpipe. Does it mean na marami ang pasok ng diesel? Normal lang ba ito or do I have something to worry about?

Thanks again...

He's referring to the base idle set screw. BISS is not applicable to diesel engines because diesel engines do not have throttle flaps (kind'a like a gas engine on WOT) and bypass circuits that control idle air. Diesel engines run by fuel metering.

As for the 1KZ-TE, kung ayaw umangat ng idle when the aircon engages, one or more faulty sensors may be the culprit or worse, something in the ECU itself.