Question about 2005 Ford F 350 Super Duty

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My F350 6L starts great when cold, will not start after engine is warm, where do I begin?

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  • Ford Master
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Air filter first. Check engine ground. Fuel filter. Idle control system/sensor.

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

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1 Answer

Heaters running cold at 90 degrees


If the engine is running at a normal temperature I would suspect the thermostat.
Normally from a cold start the coolant should only circulate through the bypass hose, the heater matrix, and back through the engine, As the engine warms up and the thermostat begins to open the coolant is directed through the main radiator - at this point you will be able to feel the upper and lower radiator hoses warming up.
If the thermostat is faulty and permanently open you will be able to feel the upper and lower radiator hoses warming up very soon after starting the engine and at the same time as you feel the heater hoses begin to warm. This causes most of the heat to be radiated away and so the heater will never warm up.
Unfortunately the thermostat is hidden underneath the water pump on a passat and requires the cooling system to be drained before it can be changed. It may also require the power steering pump to be removed to get access to the thermostat cover.

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Won't start when engine is cold,


Have someone check your fuel pressure regulator, hard cold start can sometimes be caused by that.

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Souinds like beginning of blown head gasket. could be due to corrosion on either head or block. "Diesel knock" could be due to excess compression from water in cylinder (will explain steam, antifreeze smell).

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1 Answer

P2285 code 6.0 litre ford deisel long cranking before starting after starts runs great but oil pressure gauge drops at idle


bad bearings on crank or worn oil pump. Pressure will be up when cold, but will drop when engine warms up. Check for knock in lower end. If so, bad crank bearings.

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1 Answer

I have a 1985 mercedes 500 sl. It starts fine but when the engine is cold it has no power until 300 rpm. as the engine heats up this condition gradually goes awy. I have tested the EGR valve and it op


Friend, you have a faulty temperature sending unit. Change THAT and you'll have this problem no longer. The temp sending unit, when cold, will put the engine, by the computer, into cold start mode, the engine starts getting a bit more fuel until is warmed up, then the sending unit tells the computer it's warmed up and shuts down the cold start mode. Only makes sense, Right?

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Starts cold when warm shuts off


May be the fuel pump, experienced similar problems in 1995 Intrepid. When the pump warmed up, it would start to loose pressure and car would sputter and die, but would start back up. If it started it would usually begin sputtering again and eventually die.

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1 Answer

Trouble starting when engine is warm.Starts great from cold.


try pressing accelerator slightly down when starting with warm engine

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02 Old Intrigue stalls only once after cold start


Check engine codes.
If it comes up as a Crankshaft sensor... Replace it.
These are the exact symptoms

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2 Answers

93'Saturn engine problem:


engine coolant temp sensor is most likely cracked.. I know it sounds strange but pull it if your looking at the engine it is on the right side of the head Will make the car hard to start, smoke, and the idle will often race up and down.. easy to fix 15 dollars or so..

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1 Answer

Stalls when engne warms up


Your ECT (Engine Coolant Temp) sensor is bad. What's happening is at cold start it richens up the fuel mixture and as it warms up the ECM thinks it's still cold and essentially the "choke" is still on. Also check your coolant level. If you don't have enough coolant in you engine/radiator, the ECT doesn't know what to do so it thinks it's cold.

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