Running rough at idle

2010 VOLKSWAGEN ROUTAN
139,000 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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HURRAKAHNY
  • MEMBER
  • 1 POST
I used my timing light to check coil pack output and i noticed that plugs 2,4,6 were firing nice and steady but 1,3,5 the light was flashing twice as fast and skipping blinks and i could feel the engine stumble . it is a new coil pack, new crank sensor, do you think i have some bad wiring going to the computer or its the computer itself.
this is the same vehicle as Chrysler town and country? Also, no check engine. fuel trims are good, O2 sensors working well.
I am really puzzled.
Sep 26, 2019 at 5:37 PM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
Hi,

Couple things, can you tell me what the fuel trims are especially short term when this is idling rough? Also, can you send a video of both banks with the timing light that you are referring too?

It is odd that it is not setting a misfire code and not misfiring if you can actually feel the rough idle.

Seeing this stuff that you are talking about will go a long way. Do you have the ability to monitor live data? If so, send me MAP data, IAT, ECT, and then look at injector pulse widths on both sides and let me know how far off they are from each other side to side. Thanks
Sep 27, 2019 at 1:27 PM
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