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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21632
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Masda mx5 will not start when warm

Resolved Question:

masda mx5 will not start when warm
Submitted: 10 months ago.
Category: Car
Customer: replied 10 months ago.
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Expert:  Matt replied 10 months ago.

Hello

If it starts and runs fine when cold then this could be incorrect fuelling due to a faulty water temp sensor. If this is the problem then the ECU will be leaving the car constantly ' on choke' and not reducing the fuelling as the engine warms - so unplug the sensor and clean the contacts on both sides with some switch / electrical cleaner (not WD40) and inspect the wiring for any signs of damage to the insulation especially where it runs over other components and through the bulkhead- if this doesn't help consider replacing the sensor as they're not expensive

also you don't mention what year and engine size your Mx5 is?

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