2001 Sentra SE - p0300
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kevburgess
- Posts: 2
- Joined: Thu Nov 13, 2008 11:16 am
- Car: 01 sentra se
2001 Sentra SE - p0300
Our '01 Sentra just started to run very rough and the SES light has started to flash. I checked it with my sensor and it gave the P0300 - Multiple Misfire code. I checked the plugs and they were OK. I know this is a general code, but does anyone have suggestions where to check next ?Thanks...
Re: 2001 Sentra SE - p0300 (kevburgess)
Check your maf sensor and your o2 sensors could be one of them.
Re: 2001 Sentra SE - p0300 (kevburgess)
check your spark plugs
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SpecDRacing
- Posts: 351
- Joined: Mon Apr 25, 2005 3:36 pm
Re: 2001 Sentra SE - p0300 (kevburgess)
P0300 = Multi Cyl Misfire
What will help us help you is to know more about the condition of the vehicle. By now, I would suspect the valve cover gasket is leaking. If you have not had that replaced, then it might be time. If your spark plugs were soaked in oil, that will definately do it. The distributors aren't exactly the most reliable on those older sentras either. Typically, either the bearing fails in the distributor, or oil leaks in past the o-ring and causes problems. The mass air flow meter would cause more than just a P0300. If you can put your pedal to the floor (in park or nuetral) and it revs smoothly to redline, I doubt its the MAF. If you really want to check, get a service manual, back probe the MAF connector at the signal wire and check the voltage (use the chassis as a ground). It should be approximately 1.0 volts at idle, fully warmed up. Anything like 1.2v and above or .8 volts and below is bad. Keep an eye on your coolant level. Its not common, but occasionaly a head gasket can go bad. When it does, on Nissans anyway, it tend to leak into the cylander after the vehicle has been shut off. Its a very slow leak and hard to find with a coolant system pressure tester. This would have been evident by a bit of green on the spark plugs. It looks like a green rust and it wont have much, but it will be definately green. To get a P0300 though, it would have to be leaking into two or more cylanders, which makes this even more rare. Again, it all depends on the vehicles condition. Those years have a pretty good trouble detection logic, meaning if its a P0300, then more than likely its not just an O2 sensor, as there would be a code for that as well. It is still likely, but if so, it will eventually set a code for that as well. The MAF on the other hand is a little more tricky. It won't set a MAF code untill it really sees a problem. Also, check to make sure there are no air leaks from the intake manifold or exhaust manifolds. I would steer clear of any spark plugs other than NGK, as I have seen time after time that other brands just dont perform as well in a Nissan (honda, mazda, toyota, etc.). If the plug wires are over 100,000 miles old, it won't hurt to replace them either.
I could keep going. Hope you get it fixed.
What will help us help you is to know more about the condition of the vehicle. By now, I would suspect the valve cover gasket is leaking. If you have not had that replaced, then it might be time. If your spark plugs were soaked in oil, that will definately do it. The distributors aren't exactly the most reliable on those older sentras either. Typically, either the bearing fails in the distributor, or oil leaks in past the o-ring and causes problems. The mass air flow meter would cause more than just a P0300. If you can put your pedal to the floor (in park or nuetral) and it revs smoothly to redline, I doubt its the MAF. If you really want to check, get a service manual, back probe the MAF connector at the signal wire and check the voltage (use the chassis as a ground). It should be approximately 1.0 volts at idle, fully warmed up. Anything like 1.2v and above or .8 volts and below is bad. Keep an eye on your coolant level. Its not common, but occasionaly a head gasket can go bad. When it does, on Nissans anyway, it tend to leak into the cylander after the vehicle has been shut off. Its a very slow leak and hard to find with a coolant system pressure tester. This would have been evident by a bit of green on the spark plugs. It looks like a green rust and it wont have much, but it will be definately green. To get a P0300 though, it would have to be leaking into two or more cylanders, which makes this even more rare. Again, it all depends on the vehicles condition. Those years have a pretty good trouble detection logic, meaning if its a P0300, then more than likely its not just an O2 sensor, as there would be a code for that as well. It is still likely, but if so, it will eventually set a code for that as well. The MAF on the other hand is a little more tricky. It won't set a MAF code untill it really sees a problem. Also, check to make sure there are no air leaks from the intake manifold or exhaust manifolds. I would steer clear of any spark plugs other than NGK, as I have seen time after time that other brands just dont perform as well in a Nissan (honda, mazda, toyota, etc.). If the plug wires are over 100,000 miles old, it won't hurt to replace them either.
I could keep going. Hope you get it fixed.
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