Rough Idle and stall on cold start - Page 2 - Hyundai Forum - Hyundai Enthusiast Forums

Hyundai XG 350 The mid-sized luxury model

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Old 10-20-2017, 10:41 AM
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Originally Posted by JockeHyundai View Post
Crank shaft position sensor?
I dont expect that to be the issue. If that was the problem I would expect a code relating to it.
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Old 10-20-2017, 10:44 AM
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Default Update

I noticed a pattern. It starts perfectly fine on cold mornings. The fuel trims are way negative, indicating a rich condition which the computer is compensating for. -15% and -19% on each bank.

Will be changing fuel pressure regulator this weekend.
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Old 11-01-2017, 03:37 PM
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Thumbs up Solved!!!!

Fuel pressure regulator was the problem. Starts smooth and idles fine now.

Better fuel economy and smoother engine.
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