Can anyone offer any advice to this strange problem I am having ?
Any suggestions greatly appreciated.
vehicle starts normally and runs normally on my 25km run to work in
the cool of the morning.temp 20deg C and Speed 80kph In the afternoon,
temp 30deg C. It starts normally and runs normally for the first 20
minutes after which the "check engine" warning light often comes on
and the engine will not slow run when the vehicle is stopped in
If I then switch the ignition off completely and restart the engine,
the warning light goes out and all becomes normal again. While this is
all going on,the speedometer often stops working and will start
registering again when it feels like it.
I tried driving it home deliberately slowly at 70kph and at this speed
all worked normally.
Another thing I noticed was that if I accelerate away from a standing
start with the revs getting up to three thousand or above in first
gear, it often will not slow run afterwards.
On the occasions when the engine does not stop entirely the rpm will
hunt between 200 and 1100 RPM.
The engine has been top overhauled runs very well at normal cruising
speed and runs cool.
The cooling system has been flushed,has new thermostat and new water
Oil pump and pressure sensors all recently replaced with new parts.
New petrol pump and new petrol filters recently fitted.New timing belt
plus all other belts renewed.
Temperatures , pressures and alternator charging are all spot on. The
fuel injection system has been checked cleaned and adjusted by the
isuzu agents here in Doha.(or at least they charged me an enornmous
bill for this work.) New spark plugs fitted. What is the solution?