How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 119
Experience:  BEng hons Mech engineering, in auto industry 22 years
Type Your BMW Question Here...
Matt is online now

My bmw x3 57 wont start,cold start engine thermometer needle

Customer Question

my bmw x3 57 wont start,cold start engine thermometer needle upover red,by playing around with key,switching on off needle might drop car starts runs for a few seconds thermo needle jumps to red,engine stops. please help.
Submitted: 4 months ago.
Category: BMW
Expert:  Greg replied 4 months ago.
Can you get hooked up to a diagnostic scan tool.
You may find you have a bad engine coolant temp sensor .
Or a bad wiring engine harness ,
If the ECU see a high temp reading the fuel air mix will be out of specs and will not start.