My car maybe extra sesitive tio Premium gas. I can't run 93 octane gas in my car consistently because it kicks my Check engine light on. I run 2 tanks of 93 for every three tanks of 87 regular. My light eventually cuts off using 87. I did a seafoam treatment 5 months ago and that helped performance but not the check engine issue. Any help will be appreciated.

 

Put in some 89 or preferably 91 if your gas stations offer it. We get 87, 89, 91 and 94 here in Canada at the Shell. I put 91 in mine; I think 94 is a bit over the top, but you can cycle between one tank of 91 for each two tanks of 89.

I think Nissan recommends the 91. 94 is maybe a bit too much for the engine. I mean, it's not a Ferrari Enzo; it's a Maxima.

 

thats odd because Ive had the Max almost a year and all I put in it is 93. Nothing wrong with it.

 

make sure the code is gas related. just because the engine light is on doesn't mean that's the problem...

 

 

Get the code that actually sets off the light and then post it up.

 

Does the 93 octane fuel have ethanol whereas the 87 octane fuel does not?

 

only E-10 has 10% of ethanol, usually the midgrade 89.

 

In the midsouth (specifically Memphis metro area), nearly all stations and fuel grades have 10% ethanol unfortunately....

 

cuz adding ethanol is cheaper, it brings up the octane.

 

I went to advance auto parts and it was giving a bank 1 and 2 code and a O2 sensor code. The Advance guy said the O2 code looks as if the car does not recognize or see the O2 sensor and that is why it is kicking out the three codes. He suggest I have a mechanic look at my O2 sensors and make sure my wiring and connections are ok. He deleted the codes and I have a appointment Tuesday with Meineke. The check engine light has not come back since Friday so I will see how it does until my appt.

 

MAF.........MAF

 

Try cleaning the MAF before you replace it. I had a p430 with crapy gas milage and new MAF indeed sloved the problem, although I haven't done the reprogramming of the ECM

 

dont waste your money at an appointment....listen to nmexmax

 

thats funny cuz ive been having the check engine light come on lately and i just switch to 93 octane gas a couple months back and i get the code p0440 and i heard its the gas cap but i always tighten after the clicks. could it just be bad gas cap?

 

o and i always erase the code when i get it wit my obd reader, does it do any harm resetting codes alot?

 

if the codes repeat, there is a problem.

 

E10 is not generally linked to a single fuel grade; a notable exception is Iowa with E0 87 octane and E10 89 octane fuels. If the mid-grade is E10, then the other grades should also be E10; mid-grade is customarily blended at the gas station from the regular and premium fuels.

 

in Omaha, all the BP stations have E10 89 and no ethanol 87 and 91.
the E10 89 usually is 87 mixed with ethanol, it brings up the octane.