[ForteGT2]

Could it be because it’s an aftermarket part? I had to replace the original with an after market one a year ago.

Highly suspect - hard to prove without codes. I've worked on 2010 Kias where the engine was running bad, no start conditions, and poor fuel economy - with no codes present or pending. In most cases it turned out to be the MAP sensor. Kia engines that use MAPs run off the MAP - it provides the data for fuel control. I always recommend buying a new factory MAP sensor.

 

[YeOldGeezer]

Highly suspect - hard to prove without codes. I've worked on 2010 Kias where the engine was running bad, no start conditions, and poor fuel economy - with no codes present or pending. In most cases it turned out to be the MAP sensor. Kia engines that use MAPs run off the MAP - it provides the data for fuel control. I always recommend buying a new factory MAP sensor.

Ok I’ll buy a factory one but I thought the 02 sensors also did fuel control

 

[ForteGT2]

The O2 sensors also provide info for fuel control - it's just that the MAP sensor is the primary input on Kias.

Remember too that upon first start the O2 sensors don't work until they get hot - so the MAP is primary.

This is one way to help determine if a problem is MAP related or O2 related. If engine runs bad before it warms up the ECM is in closed loop and the data for the O2 sensors is stored memory. If engine runs fine at first and once warmed up it runs terrible then the O2 could be at fault - typically a bad O2 will set a code right away. For some reason a bad MAP doesn't always set a code...my guess is it is intermittent enough to keep from meeting all the parameters needed to set a code.

 

[YeOldGeezer]

The O2 sensors also provide info for fuel control - it's just that the MAP sensor is the primary input on Kias.

Remember too that upon first start the O2 sensors don't work until they get hot - so the MAP is primary.

This is one way to help determine if a problem is MAP related or O2 related. If engine runs bad before it warms up the ECM is in closed loop and the data for the O2 sensors is stored memory. If engine runs fine at first and once warmed up it runs terrible then the O2 could be at fault - typically a bad O2 will set a code right away. For some reason a bad MAP doesn't always set a code...my guess is it is intermittent enough to keep from meeting all the parameters needed to set a code.

Tried to post a screen recording of the readings from my scan tool. Voltage from the map sensor stayed at a steady 1.0 1.1 volts and intake air temperature voltage stayed at a steady 1.8 volts even while increasing throttle to 2,000 rpm’s at idle.

 

[YeOldGeezer]

The O2 sensors also provide info for fuel control - it's just that the MAP sensor is the primary input on Kias.

Remember too that upon first start the O2 sensors don't work until they get hot - so the MAP is primary.

This is one way to help determine if a problem is MAP related or O2 related. If engine runs bad before it warms up the ECM is in closed loop and the data for the O2 sensors is stored memory. If engine runs fine at first and once warmed up it runs terrible then the O2 could be at fault - typically a bad O2 will set a code right away. For some reason a bad MAP doesn't always set a code...my guess is it is intermittent enough to keep from meeting all the parameters needed to set a code.

I put the original sensor back on and the readings go up and down with change in throttle. However the upstream O2 sensor is still staying at -0.2 volts even with engine hot.

 

[ForteGT2]

Tried to post a screen recording of the readings from my scan tool. Voltage from the map sensor stayed at a steady 1.0 1.1 volts and intake air temperature voltage stayed at a steady 1.8 volts even while increasing throttle to 2,000 rpm’s at idle.

I put the original sensor back on and the readings go up and down with change in throttle. However the upstream O2 sensor is still staying at -0.2 volts even with engine hot.

With the replacement MAP the voltage stayed the same? Doesn't sound right.

Have you tried cleaning the O2 Sensor? It's been so long since I ran a scan on a 2010 2.0 I can't remember what the O2 sensor is supposed to read - but it should change when it gets hot.

Andy’s DIY: Clean O2 sensor’s instead of replacing - YouTube

 

[YeOldGeezer]

With the replacement MAP the voltage stayed the same? Doesn't sound right.

Have you tried cleaning the O2 Sensor? It's been so long since I ran a scan on a 2010 2.0 I can't remember what the O2 sensor is supposed to read - but it should change when it gets hot.

Andy’s DIY: Clean O2 sensor’s instead of replacing - YouTube

I haven’t tried cleaning the O2 sensor. I’m afraid of breaking off the sensor

 

[ForteGT2]

I haven’t tried cleaning the O2 sensor. I’m afraid of breaking off the sensor

They're pretty tough. besides, if it does break it will be the perfect excuse to get a new one...

 

[YeOldGeezer]

They're pretty tough. besides, if it does break it will be the perfect excuse to get a new one...

Ok I’ll try. The only thing I have to do now is find a sensor socket and to climb over the engine to get to the 02 sensor.

 

[YeOldGeezer]

So just an update the 02 sensor is working fine. It’s my brain that’s messed up 🤣🤣 I was looking on my scan tool and they give an option for a binary type and linear o2 sensor. My brain thought it was binary. That’s why I thought it wasn’t working. Went back to the other (linear) option and the 02 sensor graph came alive. 😔🤬🤣 now just need to fix my brain because I’m sure that’s all messed up too but I can’t pull any trouble codes or even PIDs

 

[ForteGT2]

The hazards of modern technology...