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Old 05-31-2016, 03:02 PM
Hatterasman Hatterasman is offline
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Default 94 B2300 4-Cyl Won't Start When Hot

Hello! I am trying to help my sister figure out what is wrong with her 1994 Mazda B2300 4-Cyl pickup. It starts right up when cold, but if she drives it around town and then shuts it off, it will not start until it has completely cooled off. After some research, it appears that others with similar issues have replaced the Engine Coolant Temperature Sensor (not the sending unit for the dashboard temp gauge). Supposedly, this sensor communicates with the ECM. I am confused as to how this sensor going bad could make the truck not start when hot. Does it act like a kill switch or something? I have no tester for codes. The ECM has been replaced as has the crankshaft position sensor. Any advice would be appreciated. Thank you.
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Old 06-02-2016, 05:55 AM
tomw0 tomw0 is offline
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Default Re: 94 B2300 4-Cyl Won't Start When Hot

Things to try...
Check fuel pressure
Check for spark
Try holding the gas pedal down, WIDE OPEN will clear the intake manifold of excessive fuel if present as the computer knows this trick.
Does she hear the fuel pump run when the key is turned to ON? It should run for 3-5 sec and then shut off.
A coil can go 'open' when it gets hot, and then when cooled down, close up and make contact again. Coil being any wound coil, ignition coil, relay winding, etc.
tom
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