New battery in 03 VW Passat, engine turns but will not start.
Car has been outside in -20 degree weather for 2 days. New battery purchased from VW dealer was changed on second day. After a couple of start trys there is noticable gas smell. Gas tank is 3/4 full. All fuses are good including one for fuel pump. All appropriate dashboard lights work during engine turnover.
Re: New battery in 03 VW Passat, engine turns but will...
Possible flooding, cold weather can freez open injectors causing them to leak into the cylinders. Press the gass pedal all the way to the floor and crank the engine for no more than 60 seconds. The cylinders will clear themselves allowing proper mix of air/fuel and should start easy. If that does not solve please specify if the engine is 1.8l or 2.8l.
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I suggest that you go to an auto parts store and have them run a diagnostic it's usually free. If not you can purchase a small diagnostics tester for around $50.
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cold weather kills batteries this time of year...heres why..most batteries are a chemical factory..the acid and water separate as the battery discharges..also the chemical process is lessened when the air temps go below freezing by around 50% or more depending on the age of the battery..in extreme cold areas, external heat sources are required to keep engines warm enough to run..in alaska for example,the batteries are taken out entirely and put inside to keep warm..sometimes a fire pit is used to warm the engine from below (red hot coals no flame)..also in very cold weather, the engine oil will get very thick..in some cases the oil will actually glue the engine semi solid..locking it up..if its a cheaper oil that whathappens..I like 20 miles north of st louis in illinois and when it gets below 30 degrees outside i place a under cabinet 350 watt heater(used for keeping food warm to serve) upside down under my engine overnite..this keeps the block warm and the oil thinned out..and works very well for me..my car will start whe no one elses will in my neighborhood..hope tyhis helps you..
check battery cables make sure they are clean and tight and make sure the alternator charging battery. first check battery volts. should be 12.6 volts. with engine running alternator out put at battery should be 13.5 - 14.5 volts. if not either alternator failed.check alternator power feed wires and voltage regulator wires for damage or make sure electrical wires has tight connection.check alternator battery.first turn off radio before before disconnecting negative battery cable.
possibly ajusting itsself. any severe weather/pressure changes in your area? and if so does your cars cpu compensate for this (thinks its at a different elevation etc then resets its idle proper after a certian time? I have heard of this but not sure if VW uses it) perhaps ask the service tech.
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)