No start

2005 HYUNDAI SONATA
128,600 MILES • 2.7L • 6 CYL • 2WD • AUTOMATIC
Avatar
ARTURO MEDINA
  • MEMBER
  • 1 POST
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.
Feb 24, 2020 at 7:14 PM
Advertisement
Avatar
SCGRANTURISMO
  • ✓Experienced 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
Feb 24, 2020 at 8:00 PM
Avatar
ASEMASTER6371
  • ✓Experienced 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
Image (Click to enlarge)
Attached Media
Feb 24, 2020 at 8:18 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle