Question about Isuzu Pickup

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Engine surges I have a 2003 KB300 TD double cab. This vehicle surges (almost like you have been rear ended but no accident) while driving. Usually when RPM's are close to 2,000. This vehicle is also stalling when idling. I am desperate as I use this vehicle everyday to get myself to work and my very young son to school. I have replaced the Diesel Pump, the Diesel Primer, The PSG5 unit, the rotation sensor, the fuel tank, all the fuel pipes, I have had each individual wire in the wireharness checked for complete circuit. The mechanics no longer know what to do and are guessing at problems. I do not have another 30,000 to put into this if they cannot ensure it will fix the problem. (they said the 20,000 for the diesel pump work would fix the problem. Please advise as I cannot trade it in driving like it does, and I can't afford to completely rebuild this truck part by part. Thank you Kheira Kortenbout keaganmitra@gmail.com

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  • Kheira Kortenbout
    Kheira Kortenbout May 13, 2014

    Hi gentleman, I am not the mechanic so JD Browning I appreciate your answer but I am lost --- The pump was not refurbished I purchased a new one from the people isuzu sent me to. Secondly Phillip Long, I don't know if true but my mechanic (when i asked about that specific sensor) said it would throw a fault code if that was the issue for that particular sensor as an electric person suggested that. (also was told it was a guess and the part here is 2,100 so not cheap. (that is in Rand but I make Rand so that is a huge portion of my rent. I have no problem replacing but if it turns out like everything else not to work then it is money I cannot afford. My engine # is 4JH1911980 if that will help you at all and the VIN is ADMTER77D2C147819

  • Kheira Kortenbout
    Kheira Kortenbout May 13, 2014

    Jonah I can't tell if it is idling rough

  • Stan Ford May 20, 2014

    Hi would say you have a fuel problem .does the exhaust give out excessive black or white smoke . have you changed the fuel and air filters?

  • Kheira Kortenbout
    Kheira Kortenbout Jun 13, 2014

    Hi Stan, No black or white smoke although fuel quality here in South Africa is always an issue. We do regularly change the fuel and oil filters

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Surging of a diesel engine is normally related to a fuel supply problem. There may be air getting in from a seal problem , fuel supply from the tank---tank venting problem--or the fuel return from the injectors is under pressure and not returning freely---blocked /squashed return line. Check the vent valve at the top of the tank as they block up from dust or wasp nests . check that the return line to the tank from the injectors has not been squashed on the chassis by a rock or bolt.

Posted on Jun 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Rough idle and generally running terrible!

if idling rough sound like air in system.and your injection pump timing is off.

Posted on May 23, 2009

DIESELMUDDER
  • 2760 Answers

SOURCE: replace fuel pump on 03 Ford F350 diesel

simple : obtain replacement pump from parts provider (no used stuff)

Now help me out here: thats the year they were bolted to the pass side front of engine
and not inside the tank right? (better go look to see for sure)

using a tube wrench unscrew the fuel lines (i use large wire nuts to temp block off fuel leakage)

with a 12 mm wrench undo the two side bolts holding the pump to block

wiggle pump it should come straight off

clean mounting place on block with solvent let dry

silicone back (or use gasket that comes with pump ) of pump

apply pump to block (depending on where crank stopped you may have some tension on arm you will have to overcome to get flange to meet block )

use locktite (blue)or simmiliar thread lock on bolts retighten firmly but not hang up the dog tight

use light grease or vasolene on tube connections don't try to tighten dry

Now the fun part your diesel now has air in the fuel system

there are two ways to remove this ( hard and harder)
your choice here are both methods

loosten the fuel supply line for #8 injector ( I did not say remove) 1 full turn ought to be enough

crank engine 30 seconds only
wait 5 minutes for starter to cool down
crank engine 30 sec again
did it start but runs rough while it's still running tighten #8 injector (caution fuel under high pressure)
engine smooth out good your lucky
engine did not start yet
wait 5 minutes
crank engine 30 sec again
start yet
if so tighten #8 injector up

Now here's something I've done to my diesel to make this much less a hasstle

trace fuel line as it comes up from pump
obtain a small low pressure electric fuel pump and a two short pieces of fuel line
and a few clamps

use tube cutter and cut fuel line just before it bends to go in filter
deburr edges
slide tube and clamps over pipe (both sides)
insert pump observe flow arrrow towards filter

the wires of pump can be stretched over to #1 battery terminals

now any time you change a filter or open your fuel system for any reason
all you need do is connect pump to battery
open sharader valve on top of filter for a few min
and start truck as normal
then disconnect wires and stow away for another day

Posted on Jul 08, 2009

pippall
  • 1486 Answers

SOURCE: 1995 Chevy Diesel, Randomly dies

Sounds like you have a problem with the crank sensor.They can have an intermitant fault.like an open curcuit Try changing the sensor.good luck hope that was helpfull.

Posted on Jul 24, 2009

  • 1986 Answers

SOURCE: 1997 2.2L base Cavalier idles rough and randomly stalls

Have they checked your TPS sensor as this is the most common cause for rough idles and stalls...

Posted on Aug 21, 2009

  • 1 Answer

SOURCE: (TOYOTA SURF 1990 TURBO DIESEL) No diesel coming out of fuel pump

my 3c diesel turbo engine start but for a few minute it kick off when i pump it continue running again

Posted on Sep 09, 2009

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2000 Suzuki Esteem 1.8L.. I went to start my motor & turned it off right before started. I heard some kind of backfire. Then I started it and it's been idling high, the surging. Please help!!


scan it yet, a FULL OBD2 scan? why not?if not.
now is the time...


the 1.8L J18 engine, same as the older Sidekick sports used.
same engine , know it I do.
its the precursor to the J20, (j18 is under-stroked, j20 with many of the same parts. inside)
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if there are exhaust cracks and then engine goes rich this can happen( a double failure)
if how ever BACK means, back to the Air cleaner, then that be different reasons, (timing)


engine now starts.?>
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JUST?
SURGE,. you never said.

does engine get hot? 180F or more and holds (y/n)
ever get a full tuneup this decade,
most dont so i tell you, bad spark causes, misfire and raw fuel is wasted to the exhaust and sure can go boom.

surging usually means the ISC can not control idle
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PCM errors, inside it. (dangerous too)
a modern car, if idle goes too high the ecu commands the ISC closed
and holds it there solid, (safe way , no hunting allowed now)]
so if this car surges, it's , lean engine.

some think flooding is surging.
and this is usually below 800 rpm,
almost stalls, then corrects, seems like a surge.

next time post rpm range of surge.?????

do not drive a surging engine, do not be like Toyota drivers. (over 800 rpm hot)

surge from 400 -800 rpm is class 1 surge.
surge from 800 to say 2000 RPM is class2, and very dangerous to some folks, (key off, get car fixed, tow it)

The ECU controls idle speeds. (hard coded servo controls)

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