Diesel Fuel Injection System Help Desk

**drillerXPLR** · October 9th, 2012 08:27 PM

Sir Dieseldude,

What's your opinion about using diesel additives that claims that they not only prevents fungal contamination but also maintains the entire fuel injection system at the same time.

Thanks and more power.

**mojics** · October 11th, 2012 04:56 PM

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? 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 and there is this weird "tak-tak-tak" like sound coming from the engine.

Any input would be greatly appreciated.

Thanks!

**Dieseldude** · October 11th, 2012 05:27 PM

Originally Posted by drillerXPLR

Sir Dieseldude,

What's your opinion about using diesel additives that claims that they not only prevents fungal contamination but also maintains the entire fuel injection system at the same time.

Thanks and more power.

I cannot comment on this as no brands were mentioned.

From experience, Stanadyne of US makes the best diesel additives.

**Dieseldude** · October 11th, 2012 05:53 PM

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!

**macmac pogi** · October 11th, 2012 09:45 PM

Sir dieseldude,

yung mercedes benz 240d AT ko po mausok na po anu po kaya kelangan gwin dun para mawala ung usok nia???

**Dieseldude** · October 11th, 2012 11:44 PM

[QUOTE=macmac pogi;2022319]Sir dieseldude,

yung mercedes benz 240d AT ko po mausok na po anu po kaya kelangan gwin dun para mawala ung usok nia???

Mahirap sagutin dahil kulang sa detalye ang tanong mo.

**mojics** · October 12th, 2012 11:41 PM

Originally Posted by Dieseldude

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** · October 13th, 2012 03:01 PM

Originally Posted by mojics

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** · October 13th, 2012 03:21 PM

Originally Posted by Dieseldude

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** · October 13th, 2012 04:50 PM

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...