Code P1520, engine flooding?

MALLYBOY

MEMBER
2003 KIA SORENTO
3.5L
V6
2WD
AUTOMATIC
216,547 MILES

This vehicle seriously overheated and burned cylinder seal (gasket) and also blown radiator. So, it was admitted in my workshop, and I disassembled the cylinder head and replaced the cylinder gasket. I reknit the valves and replace the valve oil seal. I began to crank; it took a long time before it finally cranked. 20 minutes after it cranked and idled, I began to see black smoke and I diagnosed and detected P1520: intake manifold runner malfunction. When I went to check the location and the vehicle stall, when I tried to crank, it failed to crank, and I removed the engine oil dipstick and only to see that fuel had flooded the engine and mixed with engine oil. I checked to see if will get fuel pressure regulator, I didn't see, and I also checked to see if there is Oxygen sensor code. There was none. Then what could be the cause of this engine flooding?

7 Replies

JACOBANDNICKOLAS

MECHANIC
108,179 POSTS

Hi,

The code, P1520, isn't relevant for this year, make, and model. At least, I can't find anything in the manuals. I do realize it is a runner control code for other models.

The first thing I would suggest is to check fuel pressure. If it is excessive, then check to see if the fuel pressure regulator was left disconnected. It is under the intake manifold.

I attached a pic below and circled the regulator. If possible, see if you can see it using a mirror to determine if it is disconnected.

Let me know what you find.

Joe

See pic below.

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Tuesday, August 30th, 2022 AT 8:30 PM

MALLYBOY

MEMBER
300 POSTS

I want to ask?
1. Can it be possible for a sensor that was not equipped on vehicle to display a fault?
2. That vehicle is 2004 and that intake manifold runner is it a vacuum type of a sensor type?
3. Can I get ECM to engine sensor diagram to confirm if it was equipped?
I need your response.
Thanks

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Wednesday, August 31st, 2022 AT 2:50 AM

JACOBANDNICKOLAS

MECHANIC
108,179 POSTS

Hi,

You shouldn't get a code if the vehicle wasn't equipped with a specific sensor. The runner is vacuum controlled. Low to medium speed torque is boosted with the variable intake manifold controlled by the ECM via a Variable Intake Control System. (VICS). The VICS consists of an actuator (operated by engine vacuum) and a solenoid that is turned ON (open) or OFF (closed) by the ECM (ground controlled) to allow the vacuum to operate the VICS actuator. A vacuum chamber with a check valve is fitted to ensure a stable supply of vacuum to the VICS actuator. The system is designed to direct intake airflow through long runners below 3500 100 RPM. Above 3500 RPM, the ECM activates the vacuum control solenoid, which in turn allows the manifold vacuum to operate the VICS actuator; intake airflow is then redirected through shorter intake runners.

As far as the ECM schematic, I attached the entire powertrain management system circuit below. It was 3 pages long. I had to cut each pic in half to make it readable. I did overlap them for you.

Let me know if this helps.

Take care,

Joe

See pics below.

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