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Engine backfires when trying to accelerate

Tiny
MRDRAKE
  • MEMBER
  • 2001 LEXUS IS 300
  • 2.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
I changed the spark plugs, coils, and wires and the car still backfires when I go to accelerate. The car does have an aftermarket exhaust. It idles well when it is parked. Any help would be greatly appreciated.
Tuesday, September 4th, 2018 AT 4:31 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
It sounds like you have a flat camshaft lobe on one cylinder. But to be sure can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response. Here is a guide to help you get started:

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

Please run down this guide and report back.

Cheers, Ken
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Thursday, September 6th, 2018 AT 10:33 AM

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