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Glow plugs means not gasoline being burned, you will truly ever find spark to be the problem; I will only credit one of the answer guys for even being awake and on point enough to have a clue, the answer involving the coolant temp is the right one, I however will suggest another angle on living with this symptom: spill about two tablespoons of gasoline onto a clean rag and hold that over the air intake, crank it it will start. This will not harm anything and will confirm you have a faulty glow plug timing issue, and for the love of sanity buy the shop manual and follow the troubleshooting flow chart, the best answer will be there.
From eddie b blunt, master mechanic 30 yrs and ticking
glow light bulb could be burned out.but glow plugs is control by ECM AND RELAY.do your vechicle start but you dont see glow plug light on to let you know glow plugs are energized heating up.also check glow plug fuse, look in owner manual in glovecompartment it will show all fuses and relays locations.
This is caused by burnt out glow plugs, when the glow plugs fail it changes the resistance so the glow plug controller/timer doesn't cycle properly, it is the same as when a turn signal bulb burns out.
DID YOU CHECK YOUR GLOW PLUGS AFTER REMOVING-CHECK EACH ONE MAKE SURE THATS YOUR PROBLEM AND NOT A BAD MODULE IVE GOTTEN A BAD ONE BEFORE THEY SEEM TO WORK FINE BUT DONT LET ENOUGH VOLTAGE OR TO MUCH VOLTAGE TO PLUGS.
you certainly have a problem, checking th glow plugs is easy, 12 volts at the harness to each plug and resistance for the for the plugs, if they are bad it will read open circuit, as for toggling the circuit, bad idea, the original circuit cuts out when the plugs are glowing, without it you willl be constantly burning glow plugs,
have you fixed this problem? if not ,here we go ,hj6ocruiser had 4lt a,2h engine if you have a 4.2 ltr engine in yours it will be ,a 1hz motor and a bugger of a job to fit(i have only done one and even though i have been asked i wont do another) the point being ,with out modification the 2 glow systems are not compat able the early 2h had 11 volt glow plugs then they went to 6 volt with a largeglowplug in the manifold (manifold heater) the 2h did chnge to the superglow system but not untill 1995 (in australia anyway) if you did not change the timer you will find you burn out glow plug s pretti regularly. if you brought it to me ,iwould remove,check and re place (where necessary)all the glow plugs and the manifold heater .then run an independant 12 volt wire, after disconecting the existing feed to the manifold probe, the new wire runs through an
independant switch fitted on the dash board to the manifoldheater.there
is no doubt in my mind that this is the soplution to your problem----- the quick fix is asquirt of aerostart into the air cleaner as you co to turn her over or else loosen the wingnut on top of the air cleaner a teaspoon or so of petrol at wingnut and fire her up, aerostartis best ,if you can let me know how you get on i`d appreciate it youdoit
the best way i have found to test glow plugs is to disconnect the wire to the plug and get you 12volt test light and put your negitive lead of the test light on the positive battery cable so when you touch the test light to any ground the light will light. so now go check your glow plugs and if you have one that doesnt light the light its burned out.