Diesel Fuel Injection System Help Desk

[Dieseldude]

hi dieseldude,

In the company that I work for we have an Isuzu IPV 4ja1 engine. mileage is 80k. emission is normal. just past emission test lately.

Driver said the only problem is whenever he's going on an upward slope engine shuts down and also whenever he steers fully ( todo kabig when maneuvering). if he starts again he has to turn the idle knob up so engine will run continuosly.

what do you think is the problem?

thank you dd.

Blocked fuel filter or faulty injection pump. Check fuel filter first.

[anthon05]

Blocked fuel filter or faulty injection pump. Check fuel filter first.

Thanks dieseldude. . i told the driver to replace fuel filter.

by the way for 4ja1 engines whats the brand of the injection pump used?

Does your shop specialized on 4ja1 injection pump also? aside from bosch

[daniel_garcia78]

Blocked fuel filter or faulty injection pump. Check fuel filter first.

sir mas ok po b tlaga yng crdi kaysa sa conventional diesel engine? nagbasa kasi ako ng review ng toyota's d4d sa hilux n innova..ang daming horror stories like engine knock, biglang humihinto yng makina tpos yng isang [papunatang baguio, nabitin yata..

plan kasi ng mom ko bumili ng innova..pro after reading the reviews..parang napa isip kmi..last sunday nagpunta kmi sa car show sa fort..nakita namin yng montero n san ta fe..ano kaya ang mas ok bilhin? sabi kasi ng danta fe agent, mas fuel eficient daw sila and combortable ang ride?
thanks

[Dieseldude]

sir mas ok po b tlaga yng crdi kaysa sa conventional diesel engine? Shempre naman, ok talaga ang CRDI engines.

nagbasa kasi ako ng review ng toyota's d4d sa hilux n innova..ang daming horror stories like engine knock, biglang humihinto yng makina tpos yng isang [papunatang baguio, nabitin yata.. Totoo yan.

plan kasi ng mom ko bumili ng innova..pro after reading the reviews..parang napa isip kmi..last sunday nagpunta kmi sa car show sa fort..nakita namin yng montero n santa fe..ano kaya ang mas ok bilhin? Basahin nyo ang mga posts sa Tsikot, tapos mag decide kayo. Mas mahal ang Montero at Santa Fe kaysa sa Innova.

sabi kasi ng santa fe agent, mas fuel eficient daw sila and combortable ang ride? Shempre sasabihin yan ng Santa Fe agent. Pero maaring totoo din ang sinasabi nya. Mabuti nga na nandito ang Tsikot para makapag survey kayo.

thanks

[egsunio]

Hi Dieseldude. Need your help. I was one of those who unfortunately got my Pajero submerged (near the roof for ~ 6 hrs) last September. Got it running after ~2 weeks but has had some problems once in a while. Last wednesday, after a few minutes of drive, the AT light started blinking so after driving for awhile to drop off my brother, i went back home. But i noticed that it was not shifting correctly already and it had a hard time getting up our driveway which has a small incline. I checked the ATF and it was full. I started it again, the blinking stopped and the power is back. Yesterday, we changed the ATF but didn't help much. The problem is intermittent. What should i check/do? Thanks.

[Dieseldude]

Hi Dieseldude. Need your help. I was one of those who unfortunately got my Pajero submerged (near the roof for ~ 6 hrs) last September. Got it running after ~2 weeks but has had some problems once in a while. Last wednesday, after a few minutes of drive, the AT light started blinking so after driving for awhile to drop off my brother, i went back home. But i noticed that it was not shifting correctly already and it had a hard time getting up our driveway which has a small incline. I checked the ATF and it was full. I started it again, the blinking stopped and the power is back. Yesterday, we changed the ATF but didn't help much. The problem is intermittent. What should i check/do? Thanks.

I would check the throttle potentiometer for loose/broken wires. This is a black round thing with three wires, mounted on top of the injection pump's control lever. Don't loosen the 2 mounting screws or adjust it's position; this is critical. This device detects throttle position and sends a signal to the transmission control unit for proper shifting.

Update us if your fix is successful.

[batosai]

[SIZE=3]4JG2 uses a rotary pump, either mechanical or electronic, depending on the model. Matutumbok natin ang pump pag napost mo ang part number.[/SIZE]

Sir hindi ko po makita ung part number, pero mine is mechenical type hindi po EFI.

Hi Dieseldude. Need your help. I was one of those who unfortunately got my Pajero submerged (near the roof for ~ 6 hrs) last September. Got it running after ~2 weeks but has had some problems once in a while. Last wednesday, after a few minutes of drive, the AT light started blinking so after driving for awhile to drop off my brother, i went back home. But i noticed that it was not shifting correctly already and it had a hard time getting up our driveway which has a small incline. I checked the ATF and it was full. I started it again, the blinking stopped and the power is back. Yesterday, we changed the ATF but didn't help much. The problem is intermittent. What should i check/do? Thanks.

I would check the throttle potentiometer for loose/broken wires. This is a black round thing with three wires, mounted on top of the injection pump's control lever. Don't loosen the 2 mounting screws or adjust it's position; this is critical. This device detects throttle position and sends a signal to the transmission control unit for proper shifting.

Update us if your fix is successful.

Sir may Idea po ba kayo kung panu malalaman kung tama ang position ng potentiometer sa isang sasakyan?


Thanks..

[Dieseldude]

Sir hindi ko po makita ung part number, pero mine is mechenical type hindi po EFI.

Sir may Idea po ba kayo kung panu malalaman kung tama ang position ng potentiometer sa isang sasakyan?

Thanks..

Hindi ko ma-explain ito sa iyo. Meron specific electronic calibration data para sa throttle potentiometer. Nasa test specifications ito ng injection pump. Ginagawa ang adjustment habang naka salang ang injection pump sa test bench.