Discussion:
runs rough with random backfire

Hello
We have a hyundia 30L-7 that has a very erratic miss and backfire. We cant make it happen, and it can be at anytime. Does anyone have any experience with this? We have in the past had a cat that the crank sensor was failing on that kind of acted like this but not sure if it's similar to the hyundias or not.

Any ideas would be appreciated
  • Posted 27 May 2015 00:53
  • By pat_r
  • joined 3 Jul'13 - 25 messages
  • British Columbia, Canada
Showing items 1 - 3 of 3 results.
Check the wires, connector of CAMshaft sensor, if not, check CRANKshaft sensor.
Change the Spark Plugs.
  • Posted 2 Sep 2020 03:52
  • By Rt210
  • joined 22 Oct'13 - 69 messages
  • BP, Hungary
I'm a beginner.
if this truck has a distributor and rotor, order the OEM rotor. I have had a few with a "**** near fits perfect" rotor, and the same symptoms, and it turned out to be the rotor was just a tad loose on the shaft when running.
  • Posted 4 Dec 2015 03:27
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
Did you get a resolution to this problem? I have a 25L-7M with about the same issues. Runs great then backfires and dies at random. Thanks
  • Posted 3 Dec 2015 14:36
  • By Hardline
  • joined 20 Feb'14 - 5 messages
  • Texas, United States

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