Question about 1999 Audi A4

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Starting problem when hot

My car do not start when hot. Have to wait until cooled down, then it will start. I have changed the mass airflo meter with a 2nd hand one but the problem is still there.

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  • John H
    John H May 11, 2010

    I dont know if this problem is fixed yet, but have you checked your radiator fluid levels? might be low, and therefore, doesnt cool down like it should..

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Agreed with above - the coolant temp sensor is a pain on these cars and when it goes bad it screws up a LOT of different things, among them hot starts.

Posted on Nov 04, 2009

Try your radiator temp sensor located near the firewall, its green with a simple clip holding it in. Its a $25 part at the dealership. This happened on my S4 and replacing it solved the problem.

Posted on Nov 10, 2008

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Hi and welcome to FixYa!

As a first course of action, I strongly suggest that you replace the ignition coil. If the ignition coil gets hot the car may stall or may not start right away till it cools down. The ignition coil is surely faulty and replacement is surely necessary.

Hope this helps and thank you for using FixYa! Have a good one!

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