Why does my Regal LS run at various RPMs while sitting still.

Tiny
KEVY03KEV
  • MEMBER
  • 2003 BUICK REGAL
  • 235,000 MILES
My regal has an idling problem. When I start it it starts real loud and settles in the area of 1500-2500 RPMs. It will run idle this high for miles. It will goes as fast as 55 MPH. When it does this my car also shifts late and stalls. Can anyone give me a suggestion on where to begin with this problem.
Tuesday, July 2nd, 2013 AT 10:37 PM

3 Replies

Tiny
SEANGRANT00
  • MECHANIC
  • 334 POSTS
First thing I would do is get the computer (OB2) scanned. This will make it easier to help in the diagnosis. Most auto part stores will do this for free. When you get the codes, write them down and let me know what they are. There are many problems that could create this symptom and without speculating for hours let's try this out first and I'll be happy to help you out in finding the problem.

Thanks look forward to your reply

Sean
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Tuesday, July 2nd, 2013 AT 11:04 PM
Tiny
KEVY03KEV
  • MEMBER
  • 2 POSTS
Ok, Sean, I just ran the check and the codes that came up were po 440 and po442
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Wednesday, July 3rd, 2013 AT 6:23 AM
Tiny
SEANGRANT00
  • MECHANIC
  • 334 POSTS
These codes are related to the EVAP system. It basically prevents fuel vapors from leaking and going into the atmosphere. The codes say you have a leak and or a vacuum problem. Typically to diagnosis what the problem is you hook up a Evaporative Emissions System Tester and it introduces smoke into the EVAP system to determine where the leak is.

Sean
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Wednesday, July 3rd, 2013 AT 1:48 PM

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