1983 jeep cj5 When idling or stop and go runs normally,but If i drive steadly at 40-55 mph the temp gage wil go very close to hot and stays there. but if i stop and let the engine idle for 2 or 3 minutes the gage will go down to normal temp.
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I think you mean the engine stalls or cuts out at Idle/30/60 mph.
More info wanted,as first is it a Man/or Auto ,what engine have you got 6 or v8??? When last servised by who,How many miles on the clock,dose it smoke when driving or starting ,are the revs ok on idle ,,about what temp dose it run at the 30/60 mph etc etc???
PLEASE send all info, ..
At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.
Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.
If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?
It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.
Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.
Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..
The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.
I had the exact same same issue with my 03 sahara at the exact same speed and it was a huge build up of dirt in the rims (live on gravel road)that may be the issue or you may have a badly balanced tire or a bad front end part(s) ball joint tie rod etc...... hope this helps!
Fuel pumps just supply fuel to the carb. Either they work or don't
work. I would make sure that the mixture screws on the carb are set
properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start
to idle rough and then back out a 1/2 turn. Check your timing also. If
the jeep has alot of miles on it, the timing chain will stretch and
it's possible that you cannot get the correct timing.