rough idle and cold heat

2003 PONTIAC GRAND AM
200,000 MILES • 2WD • AUTOMATIC
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DAVID CHANDLER FARR
  • MEMBER
  • 41 POSTS
cold start it idles rough and the RPMs are not where they need be, eventually will be normal. also seems to lack throttle at times which affects shifting, when at idle unless accelerating the heat will only blow cold.
Feb 10, 2021 at 10:27 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

The first thing to check for the heat issue is the engine coolant level. If it is low, this can happen. Also, is the check engine light staying on when the engine is running? If it is, you need to have the computer scanned for diagnostic trouble codes. Here is a quick video showing how that is done:

https://youtu.be/b2IJGfImVvw

I realize most people don't own a scan tool. However, most parts stores will do it free of charge.

Let me know what you find or if you have other questions.

Take care and God Bless,

Joe
Feb 11, 2021 at 8:47 AM
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