Rough Idle and stall on cold start
#12
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.
Will be changing fuel pressure regulator this weekend.
#17
[QUOTE=brucelee;53407]Hello,
I have an XG350 2004 with 60k miles on it. The first start of the day is rough. The car idles very very rough and and sometimes stalls. The engine will sometimes rev up by its self just before stall.
Im in the process of changing all plugs and EGR valve. Any one else had this or can point me in the right direction? Once its warm it idles well.
~~~~~~~~~~~~~~~~~
As an ASE Certified Master Automotive Technician, I honestly try to advise everyone to not waste their time and money replacing plugs, primary/secondary ignition etc until the actual problem has been properly diagnosed. I honestly wish I could start charging my customers extra money if they worked on the vehicle first. 99 times out of 100 they end up ruining a cylinder head from improper plug installment or they dont know that a plug is supposed to be torqued to the proper specs. Years ago I also had problems with people not knowing that a plug needs to be gapped or what that even meant LOL Even though these days most plugs are pre-gapped, most people end up causing more problems on top of what was wrong already and Im forced to fix whatever it is that they did wrong before Im able to begin making a diagnosis on the original problem. So under most circumstances I advise people to leave the vehicle problems to a good, trustworthy technician (avoid chains and franchises at all costs!!!!!). Unless you have some form of automotive repair training and own a professional set of tools, I really cant stress enough how important it is to give the car to a service professional as is! Not only will it save them a headache, but it will save you time and money 💰💰💰 Hope this helps!
I have an XG350 2004 with 60k miles on it. The first start of the day is rough. The car idles very very rough and and sometimes stalls. The engine will sometimes rev up by its self just before stall.
Im in the process of changing all plugs and EGR valve. Any one else had this or can point me in the right direction? Once its warm it idles well.
~~~~~~~~~~~~~~~~~
As an ASE Certified Master Automotive Technician, I honestly try to advise everyone to not waste their time and money replacing plugs, primary/secondary ignition etc until the actual problem has been properly diagnosed. I honestly wish I could start charging my customers extra money if they worked on the vehicle first. 99 times out of 100 they end up ruining a cylinder head from improper plug installment or they dont know that a plug is supposed to be torqued to the proper specs. Years ago I also had problems with people not knowing that a plug needs to be gapped or what that even meant LOL Even though these days most plugs are pre-gapped, most people end up causing more problems on top of what was wrong already and Im forced to fix whatever it is that they did wrong before Im able to begin making a diagnosis on the original problem. So under most circumstances I advise people to leave the vehicle problems to a good, trustworthy technician (avoid chains and franchises at all costs!!!!!). Unless you have some form of automotive repair training and own a professional set of tools, I really cant stress enough how important it is to give the car to a service professional as is! Not only will it save them a headache, but it will save you time and money 💰💰💰 Hope this helps!
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HangingAround
Hyundai Sonata
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09-10-2009 02:47 PM