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How do i fix my isuzu kb250 2006 model which is refusing to idle smoothly when i start in the morning.if you rave continuously it cuts off.it also cuts off when you slow down or stop at intersections.plz help

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  • Isuzu Master
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What engine is there. some 2.5L but what, gas or diesel?
exactly real engine name... is best.
this usa forum we dont have KB here. ZERO !
and isuzu died here from 2004 to 2008, 1 by 1, ended.
but zero KB here, zero books, and your engines.
you should post to your unstated countries forum on Isuzu.

Posted on May 12, 2015

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MY ISUZU KB250 2006 STARTS WITH ROUGH IDLE IN THE MORNING AND CUTS OUT AFTER A CONSTANT RAVE OR WHEN YOU SLOW DOWN AT INTERSECTIONS.


where are you , this is a USA forum and we dont have KB here.
my guess, is car is in Africa or Australia?
2.5L engine> 4 cylinders. what engine, use real name of engine.
its diesel got that.
Fuel injections systems vary by country....so no country no joy , sorry but bet the 3 person ever to tell country there... "!!!!
so I answer non specifically...... do to that....
Diesel 101:"
does it run for short time on test fuel?, if yes engine is ok if it sounds ok. if not, then the engine is bad (compression checks)
(fuel in a spray bottle means test fuel) sprayed in to the air induction."basics"

filters are next,
fuel pressure tests. (on common rail very tricky this)
glow plugs, i check current on each plug wire. (a meter with amp clamp device, mag sensed current)
it must flow huge current here, if not the plug is dead. one or all.

is the system primed?

Mar 31, 2015 | Isuzu Cars & Trucks

1 Answer

My isuzu kb 250 is having a hard start in the morning and will idle rough and picks up later. but when you try to accelerate it looses power and cuts off or cuts off at intersections when I slow down. It...


wow NO YEAR CAR STATED are you kidding?
what country you just posted a non usa car on a usa forum.
so what engine>? cant fix engine (any) not knowing that.
seems like Diesel, (Glow plugs)
seem you are guessing?

if diesel is it direct injection? we cant guess that either.
but if it is ,ever use a scan tool;?

what car, kb250 something, is it a pickup truck
what engine,
what country.
what miles.
is fuel good? did car sit long, a year?
do not disconnect sensors. ever.
nor bypass pumps, ever. (cept a few minute test) but bypassing pumps invites blowing the H3LL the injector ECU. big bucks that.
the pumps are run this way to prevent CRASH on burn , like seen on TV, ever see one for real.? not pretty, (cant unsee that.... ever)

Mar 31, 2015 | Isuzu Cars & Trucks

1 Answer

My Isuzu KB 280 2004 Model vibrates when i start it in the morning during cold weather. I'm forced to hold the accelerator for a while for it to idle. After 8-10 mins then it idles. What are the normal...


Your car should be idling somewhere at 1000 rpm. If it is vibrating in cold weather, it is probably because you need a valve job. I wouldn't recommend doing this yourself unless you are confident in your abilities. What is happening is that the small problem of your valves being too loose is being compounded by the cold weather contracting the metal in your engine, so everything has greater clearances. Once your engine warms up, the metal expands and the problem appears to go away. However, your car will continue to not be as powerful or efficient as long as this is happening. Just call around and get some quotes from shops on a valve job. Shouldn't be uber expensive as it requires no parts and only takes a professional an hour or so.
This is a normal problem to have-- some Hondas need a valve job every 36k or so.

Mar 05, 2014 | Isuzu Cars & Trucks

1 Answer

Trooper refuse to start unless primed by petrol and idles unevenly thereafter


Check glow plugs and valve clearances, both of these will cause bad cold starting, but once hot will start fine

Sep 07, 2017 | Cars & Trucks

1 Answer

Won't idle


check fuel pressure regulator also idle air control solenoid.

Apr 11, 2009 | 1986 Isuzu Trooper

1 Answer

88 Isuzu truck (4 cyl) has terrible idle/black exhaust


did you check for vacuum leaks probably a vacuum hose thats been knocked off or eroded and needs to be replaced.

Mar 06, 2009 | 1988 Isuzu Pickup 2WD

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