Engine backfiring

Tiny
HUNTER STUCKER
  • MEMBER
  • 1997 DODGE RAM
  • 5.9L
  • V8
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
My truck has started backfiring. It drops to a low idle when I start it, and it makes a weird noise when the rpm's drop.
Wednesday, September 25th, 2019 AT 10:00 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This could be a problem with the Idle Air Control (IAC) valve on your engine. This is a PCM controlled valve that allows the proper amount of air to bypass the closed throttle plate when the vehicle is at idle. In the diagrams down below I have included diagnostic testing guide for your vehicle's IAC valve. Please go through it and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Wednesday, September 25th, 2019 AT 11:15 PM

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