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When engine is cold ,i get a hard start - 2005 Mazda 3

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This can be caused by many things like a bad fuel pump not holding preasure or a bad coolant temp sensor giving a false reading or bad module. the best thing would be to have a scan tool hooked up and look at all the input and output readings to see if something is off, and also a fuel preasure gauge to watch the preasure. this is going to need a shop otherwise youll be geussing and thats expensive, sorry i couldnt help too much.

Posted on Aug 06, 2010

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Posted on Jan 02, 2017

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2002 Ford Mustang GT, CAR STARTS UP FINE WHEN COLD. Hard to start when warm No Check Engine lights come on.


Think about how the vehicle is acting. Starts fine when cold, hard to start when warm. In these computer operated systems, the computer runs everything. Starts fine when cold: the computer has the engine in cold start mode putting more fuel in till it warms up. Temperature sending unit in the manifold sends a message to the computer telling it to stop the cold start mode and it stops dumping excess fuel into the cylinders and it runs fine. IF, mind you, IF the temperature sending unit is faulty, it's not telling the computer to stop the cold start mode and is flooding the engine with fuel cause it's sill in cold start mode. This is my take away on your situation and the temp sending unit is something to check to be sure it's functional. Check it out. I hope this WAS the answer to your problem my friend. It's typical. Luck to'ya Bro.

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