WOULD A STUCK OPEN THERMOSTAT MAKE THE ENGINE ...

  • Tiny
  • riebed
  • 2000 Kia Sephia

Hi would a stuck open thermostat make the engine run rough, also could a clogged gas cap do the same?

Thursday, December 22nd, 2011 AT 4:42 AM

4 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

The stuck open thermostat would not cause the problem but a faulty gas cap would as it involves the EVAP system.

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Thursday, December 22nd, 2011 AT 12:01 PM
  • Tiny
  • riebed
  • Member

The reason I suspect this to be atleast part of the issue is that it happens even more intensely after I get gas-I will have the cap checked by a mechanic(pressure gauge I suspect) or what?

Thanks for the response

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Thursday, December 22nd, 2011 AT 3:32 PM
  • Tiny
  • mhpautos
  • Expert
  • 29,839 posts

Replace the thermostat as well if it is suspect, if stuck open the engine may run to cool and this will affect tune as the coolant temp sensor, fit a new cap and report back what the effect is.

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Friday, December 23rd, 2011 AT 8:56 PM
  • Tiny
  • riebed
  • Member

Thanks for the reply-I followed what you recommended to do and it did smooth out substancially-
Thanks Again

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Saturday, December 24th, 2011 AT 9:10 PM

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