No start

Tiny
ARTURO MEDINA
  • MEMBER
  • 2005 HYUNDAI SONATA
  • 2.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 128,600 MILES
I changed the sensors of the Cam and Cram shaft- the O2 sensors (4). I cleaned the catalytic converter and I checked the timing marks. But when give start it gives explosions and it sounds like when the spark plug wires are cut. Thanks for the help.
Tuesday, February 25th, 2020 AT 3:14 AM

2 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like you might have a problem with your vehicle ignition timing. In the diagrams down below I have included a diagram of where your vehicle's ignition timing should be at. If you need instructions on how to get to your vehicle's timing belt, please let us know and we can get those right over to you.

Thanks,
Alex
2CarPros
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Tuesday, February 25th, 2020 AT 4:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good morning,

Clean the catalytic converter? You cannot clean the catalytic converter.

Did you check the compression? I would start there to be sure the timing is correct. Backfiring is a result of a timing issue.

https://www.2carpros.com/articles/engine-backfires-while-running

https://www.2carpros.com/articles/how-to-test-engine-compression

Can you post a video of it cranking?

Roy
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Tuesday, February 25th, 2020 AT 4:18 AM

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