Stalling and hard to start

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So at idle the miss fire is constant like one cylinder is firing at all?Also any codes to tell us which cylinder is missing?
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Saturday, May 21st, 2016 AT 12:04 PM
Tiny
1042549
  • MEMBER
  • 15 POSTS
It had a po304. I put coil cyl 4 on cylinder3, and vice versa. I found I had a po300 after. I figured 4 coil was bad, after changing the coil I had a smooth running auto. Thanks for your time.
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Saturday, May 21st, 2016 AT 4:31 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That's great glad to hear you got it fixed those coils go bad all the time.
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Saturday, May 21st, 2016 AT 4:55 PM
Tiny
TRAILBLAZER KEVIN
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
2003 Trailblazer, 6cyl, My won't start when the temperature outside gets below 30-35 degrees. When the temperature is warmer is starts right away. Check engine light comes on when it does start and after the second or third start goes off. Have taken to local shop and they say the codes are not common and seem to think it is in the wiring. The temperature has been under 30 degrees for a week now and will not start now. What is wrong?
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Tuesday, December 17th, 2019 AT 6:58 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Check to see if you are getting spark and fuel to the engine. If it won't start, one will be missing. Refer to our homepage under the DIY section for direction for checking both. Once you determine which is missing, then you know what circuit or system to attack.
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Tuesday, December 17th, 2019 AT 6:58 PM (Merged)
Tiny
FALEULU11
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET TRAILBLAZER
  • 2.0L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 140,000 MILES
Hey I have a 2002 chevytrailblazer ltz with 140,000 miles on it mine car engine started shaking an its little hard to go up hills I dont know if its the engine? Or something eles?"
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Tuesday, December 17th, 2019 AT 6:58 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Yes, it's the engine. What you described is typical of a misfire. How long has it been since the spark plugs were replaced? Have you checked for diagnostic fault codes? Many auto parts stores will do that for you for free. Has the Check Engine light turned on? If it has, most likely there will be a fault code indicating which cylinder is misfiring. If new spark plugs don't solve the problem, you might also suspect one of the ignition coils. You can verify that by swapping the one from the misfiring cylinder with one of the other ones, then erase the fault codes and see if a misfire code sets for the same or different cylinder.
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Tuesday, December 17th, 2019 AT 6:58 PM (Merged)

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