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Rough Idle and stall on cold start

Hyundai XG 350 The mid-sized luxury model

Rough Idle and stall on cold start

  #11  
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.
 
  #12  
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.
 
  #13  
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.
 
  #14  
Old 08-10-2018, 12:34 PM
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Default Was trouble repaired?

I have the same trouble with my 2004 XG350....65k miles.....any luck with your troubles yet?
 
  #15  
Old 08-10-2018, 12:36 PM
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Ooops, sorry, missed your final threads....cool will try the fuel regulator. Thanks !
 
  #16  
Old 08-11-2018, 08:00 AM
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Posts: 248
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If the fuel press regulator doesn't correct the problem, consider the crank sensor.
Here is why;
A malfunctioning crank sensor "Does not throw a code" !
If everything else checks out , smart move to change it.
 
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