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I put new spark plugs and wires in my 2000 Impala and it still runs rough. What could it be

Tiny
ROGER GOOD
  • MEMBER
  • 2000 CHEVROLET IMPALA
  • 185,000 MILES
Has less power than a few days ago and it doesn't heat up like it should. Is using a lot more gas too
Sunday, December 11th, 2011 AT 4:15 AM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Do you have any codes?
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Sunday, December 11th, 2011 AT 4:25 AM
Tiny
ROGER GOOD
  • MEMBER
  • 4 POSTS
It said misfire in #1 cylinder before I changed plugs and wires
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Sunday, December 11th, 2011 AT 4:31 AM
Tiny
SATURNTECH9
  • MECHANIC
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Have you checked for codes since you replaced the wires etc?You say its not heating up like it should but maybe the gauge says its not heating up it actually is?Maybe you have a bad coolant temp sensor?
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Sunday, December 11th, 2011 AT 4:43 AM
Tiny
ROGER GOOD
  • MEMBER
  • 4 POSTS
No I have'nt. I just picked it up at 930 tonite. Only drove it maybe a mile to get home. Itheats up just takes twice as long. To get good heat out of it. Oh its a 3.8 engine
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Sunday, December 11th, 2011 AT 4:50 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Usually a bad thermostat can cause extra time for the engine to warm up. Check out the thermostat or better yet just replace it.
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Sunday, December 11th, 2011 AT 4:56 AM
Tiny
ROGER GOOD
  • MEMBER
  • 4 POSTS
Il d do that. Just not sure what to do about the running rough. Not jst idleing but also while driving
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Sunday, December 11th, 2011 AT 5:00 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
We need to start with the exact code numbers not code descriptions. We might still have a miss firing cylinder or two.
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Sunday, December 11th, 2011 AT 9:16 PM

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