are these the same thing? also which system does a 03 max have.

reason i'm asking is because I've been getting engine pinging at 2k rpm lately and was told i need fuel injector and egr system serviced? was quoted 250. so is egr and evap 1 in the same. also would running a tank of fuel injector cleaner help?

what other thing can causes this. I alwayed used 93 and usually from Hess, could it be the gas station. any help would be nice.

 

You have an EVAP system, but no EGR. Whoever told you that you have EGR should be avoided. I wouldn't let him touch my mower. You have a somewhat common Gen. 5.5 issue with the pinging. Injector cleaner may get rid of some combustion deposits and can't hurt. Try another brand of gas first, just to see if it makes any difference.

 

can a bad evap cansitor causes engine ping? I usually use Hess cuz there the cheapest 93 grade here but i startign using sunoco or mobile and see what happens, what long term damage can the pinging causes? it only been happening for around a month or so.

 

How do you live without EGR? Seriously, does somebody know how they managed to get rid of it? I suspect, it has something to do with 'throttle by wire' thing - ECU now has full control over fuel and the air and can treat TPS signal more like a hint, not obligation. Is there some kind of FAQ on this?

 

i don't think 03 max's have a egr from stock, that y i was asking. can some1 with more experence please butt in.

 

Discount gas is cheap for a reason less detergents to help keep the engine clean pay the extra few cents and go with shell v-power I allways use it and have no knock or pinging and last time I had the engine apart the mechanic told me it looked like I have half the miles I have good gas will do wonders for the engine. Also make sure you use good syn oil.

 

You're correct, I was just curious how Nissan engineers did that - I can't see it in 2002 FSM either. Looks like 'throttle by wire' provided them necessary control. I was asking for FAQ for myself, actually.

 

my bad, i just read your post wrong. so for the pinging, you think a bottle of fuel injector cleaner and better gas will help? what is the purpose of the evap system besides for emission, can a bad evap system cuz engine pinging, i was always told that it did nothing.

also is Hess gas consider cheap?

 

I think, I can answer only one of your questions: EVAP system is to prevent gas vapors from escaping to atmosphere, this is pure emission related thing. I don't think it can cause any pinging.

 

yea this ****tard mechanic told me today i need my egr and fuel injectors serviced for the engine pinigng and i didn;t want to tell him we didnt have an egr because i wasnt sure. hopefully injector cleaner and new gas will help.

what brand of fuel injector cleaner is top notch?

 

On the VQ35 the variable intake valve timing is used to help control Nox emissions. EGR was/is used on some vehicles to cool combustion temps to help control the Nox emissions (high combustion temps can cause higher Nox). On some cars that use EGR, issues with the EGR whereby the engine doesn't get enough EGR under certain conditions, can cause pinging due to higher than designed combustion temps. If I remember correctly EGR was deleted from the '01 Maxi and obviously Nox emissions were still below the Gov't mandated limits. My '00 has EGR......go figure!

 

Evap and EGR are not the same. EGR is (engine gas recirculation) reburning exhaust gases reintroduce back into the intake(diluting) side of the engine. EVAP is dealing with your fuel fumes generated in the gas tank and also introduced into the intake side of the engine to reduce fumes and emissions. Also found out the topping off your tank can destroy your charcoal canister so I'll probably need a new one as well...I'm always topping off!

 

This is interesting - how that can be destroyed? IMHO, it's just a bucket with absorbent. If it gets wet with the gas - let it 'dry' (not overfill) for a while and it should be as good as new. Intake creates vacuum over charcoal which should make evaporate anything there much easier.

 

so should i run a bottle on injector cleaner or have the injectors changed for the pinging issue?

 

I found that info in the FSM!

 

As one rabbi said: "It won't hurt" after one women asked him whenever putting a coin in her hasband's pants would prevent him to go to his mistress . Or something like that. I'm talking about injector cleaner here.

In my opinion I don't see how replacing injectors can change anything besides moving certain dollar amount from your pocket to someone else's.

 

Here is what I found in 2002 FSM:
Makes sense, but not much to do with damaging of the thing. Yours is 2003, may be it's different.

 

is chevron tecahron any good? also gonna use shell vpower and see if it helps.

 

Both are Top Tier gasolines. That is what you want to use.

http://toptiergas.com/

 

i meant the chevron fuel system cleaner. i'm on the east coast no chevron anywhere in sight

 

It would be fine to use, but after that, switch to using Top Tier gasoline to keep your fuel system clean.

 

yea i just dropped 12 oz bottle in today and swited to shell vpower hopefully this pingign crap goes away.

i just remember i swited to 5w30 oil from 10w30 would this have any effect? im in nyc and it has been hot all summer.