No spark from coils

2000 LEXUS RX 300
118,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
JOEFROMTX
  • MEMBER
  • 3 POSTS
Lexus 300RX, changed the spark plugs and now the three front coils will not put out a spark.? Need some help... What sends power to the coils? Do I need to check anything? Codes: po302, 304 and 306. Thanks...
Dec 12, 2010 at 5:16 PM
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
The codes indicates a misfiring, not necessarily the ignition coils are not sparking. If problem occurred only after replacement of spark plugs, I would suggest rechecking the plugs because it sounds like one of the plug spark gap is completely closed.

Also check the wire harness and other connector for looseness.

All 6 coils receives power supply from the same source so there should not be any problem with that.

Please let us know if you need anything else to get the problem fixed.

Cheers
Dec 14, 2010 at 8:55 AM
Avatar
BILLWANAMAKER
  • MEMBER
  • 2 POSTS
Checked for spark at four different coils and have none. Checked ignition fuse it was good, immobilizer seems to be okay. No security light flashing which would mean fire it is armed, crank sensor bad ?
May 23, 2018 at 3:30 AM (Merged)
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
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