Gasoline in engine oil?

SKAJLET

MEMBER
2003 NISSAN PRIMERA
2.0L
4 CYL
2WD
MANUAL
115,000 MILES

1. I can smell gasoline in engine oil and around throttle body as well.

2. When I rev the car on idle to 3,000 RPMs and let go, it goes down to 200-300 RPMs and almost goes out. It feels like something is taking the air out of the engine.

3. It hesitates to increase RPM when I accelerate, but it has power. It loses the power on the hill.

4. I changed spark plugs not so long ago, but they're probably too cold.

5. I checked the resistance on all injectors, and all have around 15 ohms. None of the injectors is leaking on outside.

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It is normal to smell gas in the oil a little bit, but if the engine oil level continues to go up that is another problem. It sounds like you have a vacuum leak, or the throttle body needs to be serviced. Here are two guides to help us fix the problem. Use this guide when the engine is cold only.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Please go over these guides and report back. It would be good to run the codes as well.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let me know.

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Monday, May 8th, 2023 AT 11:16 AM

SKAJLET

MEMBER
2 POSTS

Hi,

The throttle body and MAF sensor were both cleaned. Idle RPMs stay between 600-650.

I scanned the car with OBD and didn't find any errors.

Here are parameters values I found:

- MAF sensor seems to be working perfect it returns around 2 g/s per 500rpm which is ideal according to Nissans service manual.

- the first O2 sensor oscillates between 0.1V and 0.9V, which is perfect as well.

- The second O2 sensor only oscillates with rpms higher than 2000, otherwise it stays on around 0.8V.

STFT and LTFT is where the issue occurs.
- When rpms are higher than 2000, then both values are between -3% and 3%.
- On rpms lower than 2000 and on idle both values are between -10%/15% - 10%/15%.

I wonder if this could be caused by spark plugs 2 heat values higher (cold) than standard?

I wasn't able to find any vacuum leaks. The only thing I noticed was the brake booster hissing slightly when I push the pedal.

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Saturday, May 13th, 2023 AT 7:56 AM