Question about Hyundai Sonata

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Occassionally poor accelaeration when cold lasting 2 - 10 minutes, goes away , works well warm and in all other conditions - sent to dealer for re-flash , scan - they say coils & plug wires baad , yet we experianced perfect performance

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  • glenngallant Dec 11, 2009

    WE swapped it with known good one , no change - looked further replaced mass air flow to improve condition , know all service engine lites remain off, but when car warms - the idel speeds up , it seems to suddenly get richer fuel mixture, then stalls , will start up & stall ......

  • glenngallant Dec 11, 2009

    We where told by dealer - problem existed in TPS, once disconnected it idled fine - we replaced TPS with new O E part , same , and diss-connected it too stops serging Idle from 100-1800 rpm, but on road test with tps unhooked - no SES light showed up , and Transmission would not upshift to 3 rd ... meerly 1- 2 shifts .....

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  • Hyundai Master
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Replace the coolant sensor and see if that will help,the computer senses the coolant sensor to warm up and perform.

Posted on Nov 17, 2009

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