Discussion:
Erratic timing

Have an H70Ft with vortex 2.4. Idles very poorly, sometimes backfires and misses and timing is all over the place until it reaches about 1700 rpm and then runs beautifully. Has new coil pack, plugs and wires. Also new cam sensor, vaporizer rebuilt, throttle body replaced 3 months ago and injectors have been cleaned/replaced.
  • Posted 1 Aug 2025 12:41
  • By Roy_Baumeister
  • joined 9 Aug'23 - 9 messages
  • British Columbia, Canada
Showing items 1 - 1 of 1 results.
I read your post look at the crank pulley they had a problem the key way would snap off the crankshaft and the timing would be allover the place. I believe it was a GM factory problem with that engine. I myself had to replace three crankshafts because of that problem the engine would run but timing is off and runs bad.
  • Posted 2 Aug 2025 11:05
  • By Scott_
  • joined 16 May'21 - 313 messages
  • Pennsylvania, United States
Scott

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