P0300 code on 06 Altima 2.5

Asked by Apr 09, 2017 at 07:27 PM about the 2006 Nissan Altima 2.5 S

Question type: Maintenance & Repair

Quick backstory:

About 6 months ago, my 2006 Altima 2.5 started having trouble starting up
- it would turn over fine but it would hesitate and wouldn't fire right away. I
changed the spark plugs and had both the crankshaft and camshaft
sensors replaced but the problem persisted. I ran a companion wire directly
from the terminal to the crankshaft sensor and it's been cranking fine since
(about two weeks ago).

The only problem now is that it sputters and sounds like it wants to die
once it starts. This started around the same time the issue above started
and it only happens after it starts - It never stalls or dies at idle in traffic or
anything.  

I got the P0300 code (random / multiple cylinder misfire) about a week ago
and I cleared it. The check engine light just came back on today after a
week. I've also been hearing this odd sound of water sloshing around in the
dashboard area when it first starts up. I've also noticed that I've been losing
water out of my resevoir tank for the past couple of months, too.

I'm really not sure where to start. Has anybody else seen anything similar
to this?

4 Answers

Hi - any luck diagnosing the issue? I have the exact same problem on my 2006 2.5 Altima- even the sloshing water sound. I have both a P0300 and 303 code. I'm gonna change spark plugs and the coil on cylinder 3. I'm still not sure about the water sloshing sound.

I had that exact same issue! It's the head gasket from the sounds of it. I suggest to sell it or repair it before you continue driving it. Because the car will only get worse. The water sound when you accelerate or press the gas is the water from your radiator going to your engine. Try this: Fill the radiator full, leave the cap off and have someone else turn on the car, if water shoots out of the radiator you can be sure it's a head gasket issue

Don't waste money on new spark plugs, those things last years

An update for those interested: I took it out to the shop and the mechanic cleaned out the fuel injectors, changed the coil pack and replaced spark plugs. Problem still persisted. I took it back to the shop, they ran a pressure test and found water in two of the cylinders. So the problem is either a blown head gasket or a crack in the head. Since the car has over 150k miles on it, they suggested replacing the entire engine to be safe. I decided not to replace the engine and instead to essentially drive the car into the ground and just sell it for salvage when it happens. I've been driving it for about a month now with no real issues. The check engine light comes off and on periodically and I just have to put coolant in it every couple days. Hasn't died on me yet.

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