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Next: 1998 Ford F-150
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External
Since: Apr 09, 2006
Posts: 5
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(Msg. 1) Posted: Sun Apr 09, 2006 9:55 am
Post subject: hard to start
Archived from groups: alt>autos>isuzu (more info?)
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while having no problem starting first time for the day, my trooper has developed
problem starting once the engine is hot (driven at least for 20-30 minutes)
what's odd is that even if the first engine start occurs late afternoon, it starts
fine, although with low initial revs (at 300 to 400 rpm) but at least it starts, after
that, it may take 12 tries to get started
there's no problem cranking, starter is almost new and alternator is also new
so far, have changed plugs and the fuel filter but have not emptied tank (in case of a
bad batch of fuel)
any other simple things I can look for? if suggesting an adjustment, kindly provide a
little more information (ie. if you suggest to turn humdinger counterclockwise while
aligned toes to the north pole, I will likely get the toes part right while not
locating humdinger) |
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External
Since: Jan 13, 2006
Posts: 7
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(Msg. 2) Posted: Sun Apr 09, 2006 12:57 pm
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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i have come across electric fuel pumps weakining after warm up ....and
also fuel line vapor lock......also check your crank sensore and cam
sensore ....sometimes also old or worn throtle sensores sometimes will
not get a good conection inside and you can press the foot peddle down
JUST ENOUGH to move the position ..i am talking 1/16 of a inch or even
less....and also the start up circut could be breaking down after warm
up ...hope this helps |
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External
Since: Feb 15, 2006
Posts: 5
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(Msg. 3) Posted: Sun Apr 09, 2006 2:55 pm
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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rick wrote:
> while having no problem starting first time for the day, my trooper has
> developed problem starting once the engine is hot (driven at least for
> 20-30 minutes)
>
> what's odd is that even if the first engine start occurs late afternoon,
> it starts fine, although with low initial revs (at 300 to 400 rpm) but
> at least it starts, after that, it may take 12 tries to get started
>
> there's no problem cranking, starter is almost new and alternator is
> also new
>
> so far, have changed plugs and the fuel filter but have not emptied tank
> (in case of a bad batch of fuel)
>
> any other simple things I can look for? if suggesting an adjustment,
> kindly provide a little more information (ie. if you suggest to turn
> humdinger counterclockwise while aligned toes to the north pole, I will
> likely get the toes part right while not locating humdinger)
>
Can you describe the colour and general look of the spark plugs when you
took them out?
--
Howard Neil >> Stay informed about: hard to start |
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External
Since: Apr 09, 2006
Posts: 5
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(Msg. 4) Posted: Mon Apr 10, 2006 3:55 pm
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Howard Neil wrote:
> Can you describe the colour and general look of the spark plugs when
> you took them out?
they are always a little dark, electrodes are clean but the trooper DOHC 3.2
engines always flood a little engine oil since the plugs sit fairly deep and
I've changed the wire harness a couple times into the new style which seals
the plugs a little better
will probably replace charcoal canister, o2 sensor, egr valve
what parts of the fuel system would you check first if you had to replace a
few sensors, adapters etc?
(fuel filter was already replaced) >> Stay informed about: hard to start |
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External
Since: Feb 15, 2006
Posts: 5
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(Msg. 5) Posted: Mon Apr 10, 2006 6:55 pm
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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rick wrote:
> Howard Neil wrote:
>> Can you describe the colour and general look of the spark plugs when
>> you took them out?
>
> they are always a little dark, electrodes are clean but the trooper DOHC
> 3.2 engines always flood a little engine oil since the plugs sit fairly
> deep and I've changed the wire harness a couple times into the new style
> which seals the plugs a little better
>
> will probably replace charcoal canister, o2 sensor, egr valve
>
> what parts of the fuel system would you check first if you had to
> replace a few sensors, adapters etc?
> (fuel filter was already replaced)
I'm afraid I don't know enough about the Isuzu petrol engine to comment
on the sensors, etc, as I have a diesel engine in my Trooper. I was just
hoping it was something simple like too rich a mixture (plugs would be
black and sooty). That would certainly give hard starting when hot. The
only other time I have known a hot engine to be hard to start turned out
to be a cracked plug but you've already changed yours. Sorry, I have to
give up.
--
Howard Neil >> Stay informed about: hard to start |
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External
Since: Apr 09, 2006
Posts: 5
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(Msg. 6) Posted: Tue Apr 11, 2006 11:55 am
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Howard Neil wrote:
> hoping it was something simple like too rich a mixture (plugs would be
> black and sooty). That would certainly give hard starting when hot
well, that does fit the description - is there some easy/quick adjustment for fuel
mixture?
it's the 3.2 liter DOHC engine
wait a minute! is it as simple as perhaps just replacing the oxygen sensor? >> Stay informed about: hard to start |
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External
Since: Feb 15, 2006
Posts: 5
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(Msg. 7) Posted: Tue Apr 11, 2006 11:55 am
Post subject: Re: hard to start [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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rick wrote:
> Howard Neil wrote:
>> hoping it was something simple like too rich a mixture (plugs would be
>> black and sooty). That would certainly give hard starting when hot
>
> well, that does fit the description - is there some easy/quick
> adjustment for fuel mixture?
>
> it's the 3.2 liter DOHC engine
>
> wait a minute! is it as simple as perhaps just replacing the oxygen sensor?
I don't really know. As I said, I have a diesel Trooper. If it is
running too rich, you really need someone who knows your engine to
suggest your options to weaken it.
--
Howard Neil >> Stay informed about: hard to start |
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