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Hello. It seems there is an fuel problem with your van. A malfunctioning fuel pressure regulator and/or a cracked vacuum hose connected to that fuel pressure regulator will cause the engine to 'flood' AND run rough. Good luck and keep me informed; if you want to.
You need to have the diagnostic codes read. Anything else is pure guessing. Those codes can point you in the right direction and often will tell you exactly what is wrong.
There are several possibilities for this problem. A "cold start" sequence is suppose to activate based on water temperature and the signal from the water temperature sensor. This makes the fuel rich and adjusts timing to make the engine run better when cold. It works like a choke only it is electronic.
There may be 2 sensors with one making the dash gauges work and the other doing the engine controls. If not 2, then 1 sensor would do the whole job.
Another possibility is an air leak in the fuel system which makes the system bleed dry overnight. It is far less common on gas engines but happens a lot on diesels.
Some earlier Ford engines from 1984 to I don't know when they stopped on trucks, would use a step-up solenoid on the accelerator bracket that worked off water temperature. Sometimes a bad water thermostat would make the temperature controls malfunction the other way (High idle, clicking, low idle) that would stall and engine as the temperature vary.
First thing I look for in a case like this is the common old vacuum leak. While the engine is fairly cold and running, take a can of spray carb cleaner and spray near known vacuum intersects or hose connections.The engine idle should change audibly if a leak is present. When a vacuum hose gets a bad split or tear,the engine performance goes wacky. Also look for a loose connection of the air intake hose(large one) or right where the connection is made to the intake.These engines are REALLY touchy where connections are concerned. don-ohio
VAG suffer greatly with a signal failure to ECU that brings the choke on when cold. Your fault is text book of this.
Follow the top radiator hose to where it meet the engine, at that point you will see a sensor, it has 4 wires and is held in by a horseshoe clip. This is the water coolant sensor, replace it and you'll be happy again :o)
what do u think about crankshaft positioning sensor????
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