Rough Idle At Start - Kia Cadenza Forum
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post #1 of 6 (permalink) Old 04-27-2017, 08:55 PM Thread Starter
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Thumbs down Rough Idle At Start

Anyone else have rough idle at start. Just got car back from dealer for the second time, they have replaced injector 5 and 6. It still has a rough idle they say computer showed injector not firing right on over 200 occasions on the first time last last week. It feels like a cylinder is missing for about 20 seconds, rev the engine and it smooths out. Taking it back Monday with only 34000 miles and telling them to change plugs and start checking coil packs. They are not diagnosing very good or the whole injector rail system is bad!!
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post #2 of 6 (permalink) Old 04-28-2017, 07:25 AM
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That sucks... Some dealerships just arent equipped with the best techs...

Good luck!
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post #3 of 6 (permalink) Old 05-19-2017, 09:08 AM Thread Starter
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Well three trips to dealer, 5 out of 6 injectors changed, 1 spark plug and a top engine flush to break up carbon done. Finally runs fairly smooth at startup. But I don't know if it won't do it again. Kia need to fix programming so the engine does not run so rich. They uploaded the newest software. But now I don't know if I can trust car to not have the problem again when out of warranty and cost an arm and leg to get repaired. It maybe hello toyota or Lexus again.
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post #4 of 6 (permalink) Old 05-19-2017, 04:03 PM
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I've not experienced anything like this. Sucks, I take it this isn't the same thing as TSB 148?

2014 Kia Cadenza, Metallic Bronze and Beige, Lux Package

Leased 3/1/14
Purchased 1/28/17

Additions:
-Full Korean K re-badge
-Ultra Racing Performance front strut tower bar
-Racing sport pedals

Cadenza products available at: https://www.k5optimastore.com/collec...denza-products
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post #5 of 6 (permalink) Old 05-19-2017, 04:12 PM
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Garage
Make sure to use only Top Tier Gas fuel suppliers, this will help avoid the carbon mud build up over the valves. GDI engines must run only on TopTier gasoline.

-Today, we're making history!
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post #6 of 6 (permalink) Old Yesterday, 07:51 AM
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Good point GrimReaper, there should be at least 1 entire thread around here somewhere (few years ago) that discusses this.

Also, our manual recommends that we use Chevron Techron fuel additive every 7k miles as part of standard maintenance.

2014 Kia Cadenza, Metallic Bronze and Beige, Lux Package

Leased 3/1/14
Purchased 1/28/17

Additions:
-Full Korean K re-badge
-Ultra Racing Performance front strut tower bar
-Racing sport pedals

Cadenza products available at: https://www.k5optimastore.com/collec...denza-products
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