Idle holds @ 1500 RPM and RPM's surge between 1100-1500

[SN95GTMustang]

the thing is if your o2 sensor failed it should set a code. So I dont think thats going to be it. Same thing with the TPS.

 

[Namboyz]

honestly your gas mileage is about right for a v6. im doing city and freeway and im only getting about 24 mpg.

you're mpg should be about 21-23 if that right?? i could be wrong. also how much city and freeway are you doing?

 

[BadgerType]

if an o2 sensor failed, than yes a code would come up

but i have had a few sensors start dying on me (reading wrong or slow) and they cause no codes

 

[SN95GTMustang]

Yeah you can get an o2 sensor to get "lazy" and start switching between .1 and .9 slowly that wouldnt set a code right away but eventually it would have to set a code like p0133 or p0139. And if it got stuck at center you should set a code for that too. Maybe even a correlation code eventually for a TPS. I mean I dont really have much experience with Honda controllers so unless they are that lazy you should get those things eventually. But yeah your right the sensor could have gone "lazy" and not repond as quick as it should or so forth and cause an issue without setting a code for now. Which sux because those are the hardest to diagnosis without the data display of a scan tool. But eventually it should set a code, how long that would take I have no idea, lol.

 

[KO iNfAmOuS]

its now three days and it still does it :/ im bringing it to my mechanic Monday, but this morning there was even more smoke the my exhaust..I hate this lol...idle almost around 1550-1600

 

[BkzTafetta]

I've been having the same prob. except mine randomly goes up and down from 1500 to 2000 a couple times then goes down to 1200 for like the rest of the day...then the nex time i turn it on it might b fine...just does this randomly and its annoying....could this b the idle control valve as well?

 

[SN95GTMustang]

I would suspect the IAC for an idle issue, but not for the smoke issue. Sounds like something else is going on.

 

[CG6Lemon]

if white smoke comes out, isnt that a problem with a blown head gasket?

 

[KO iNfAmOuS]

Well im thinking the smoke is due to whatever the problem is because surging is due to improper air/fuel mixture and since it is running rich it is burning off rhe excess gas

 

[SN95GTMustang]

if white smoke comes out, isnt that a problem with a blown head gasket?

Usually thick white smoke means coolant burning. But that is usually followed with overheating.