Because the temp sensor (BTW this is NOT the temperature guage sending
unit) tells the ECU the temperature of the motor so that the ECU can
send the correct length pulse to the injectors.  If it has failed, it's
most likely telling the ECU that the engine is cold when it's not.  That
will do the same thing as pulling the choke all the way out on a warm
carburated engine. Instant wet spark plugs.

Jim

Joseph Fortino wrote:

>why does the temp sensor not allow the van to start?
>
>