Kia cerato runs poorly at low speed/rpm - Kia Forum

 
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post #1 of 3 (permalink) Old 03-26-2019, 04:34 PM Thread Starter
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Unhappy Kia cerato runs poorly at low speed/rpm

hello community

whenever i start my cerato koup 1.6L DOHC 2011 65km (45miles) on the clock, from a cold start, it runs smoothly. after 5 to 10mins of drive time (or maybe 1 to 2km), it starts to run rough. it's like random intermittent and instantaneous lags or cuts in power(its seems like a millisecond of engine power cut effect). i noticed that this happens at low rpm i.e: 2000 at any gears (manual gearbox but difficult to notice on 1st gear) with electrical loads or not. however at higher rpm on the highway at a 100km/h (60m/h), it runs smooth. not sure if whether at that speed or rpm the engine stills run bad but is unnoticeable. i also found out that when idling, it stills run rough (when listening to the engine sound).

Tried to read codes: P0507- idle speed higher than expected. I cleaned the IAC and the idle rpm went down from 1200 to 800 with engine running smother on idle with electrical loads. but in any case it solved my issue of intermittent cuts.
Tried to look for the camshaft sensors in order to get them replaced but I was a bit surprised to notice that the car isn't equipped.

The engine always starts right away and never stalls on idling.

The spark plugs were replaced 6 months ago. What other options i'm left with?

Maybe a faulty ignition coil?
a bad fuel pump regulator?

someone has ever been through?

thanks for any help or advice

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post #2 of 3 (permalink) Old 03-30-2019, 10:29 PM
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Possible issue can be an induction air leak. This can cause the engine to run Lean and more so at lower engine rpms than at higher ones. The reason the engine runs smooth at first start up is because the fuel is usually increased by the computer for a cold engine. If you have access to an engine data reader that can display Short Term Fuel Trim values you can check the Short Term Fuel Trim at idle versus higher RPMs. If there was an intake leak you would see a high positive Short Term Fuel Trim at idle and a lesser one at high RPM.
Check out You tube video "Secret of Engine Problem Diagnosis- Fuel Trims Pt.1" by Schrodingers Box

youtube.com/watch?v=5WnM_NsOtd8&t=53s"]Secret of Engine Problem Diagnosis- Fuel Trims Pt.1 - YouTube
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post #3 of 3 (permalink) Old 04-01-2019, 10:49 AM Thread Starter
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thanks for the tips. i do have access to these data using Torque mobile app and the cheap OBDII device. these values do fluctuate at any given rpm.
checked also the video. but a lean engine does not necessarily have the symptoms I have right now. my first choice of investigation for now is the camshaft sensor. I managed to identify it and quoted the part number. bought a cheap one online and waiting its delivery. will test it first and discard any risk that its that sensor who is causing so much inconveniences. as i watched in a video on youtube, heat do affect worn out camshaft sensors and the symptoms are much pretty common to what i got. will update the post in a month or so because I will not be around for a while. trip ahead.
I promise i will also check the fuel trim whether the issue gets solved by the sensor replacement or not.
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