I was bootin around today pretty hard and when I got home I left the car ideling while I went inside for a minute or two. When I got back outside I noticed my car ideling diffrently didn't really see it but it sounded like it was bouncing between 1000 and 3000 every 5 seconds or so? Why would it be doing that and should I be woried? Any advice would be great! Cheers

 

1. Not normal.

2. any recent mods to the engine?

 

It's probably the fan kicking on and off... considering you couldn't see any RPM change.

 

yea, my gf said my fans sounded really loud when we were idleing sitting in a drive through that is very acoustically sound. and she asked me about what that loud rev noise was, and I said "it sounds like the condenser fan"

 

it shouldn't go up to 3k rpm though. mine goes to 1000 with the fan on. in some carsits air or low coolant and others a faulty maf sensor

 

in my car i can hear my fans click on after ive been driving hard. especially if its been in traffic a bit then driven home faster than the normal car. i can really hear the difference in idle when the fans turn on though

 

Thanks for the responces I will driver pretty good tonight and see if its the fan I am thinking and hoping it will be!

 

my car did just that one day and i find out that if i stick with one brand of gas
it wont do it any more.

 

Sticking with one brand of gas is common sense, you can do serious damage using gas that isn't meant for the car or even switching gas up without siphoning all the other gas out first.

 

wait is this true? I'm pretty sure most gas companies (all the big ones) actually refine their gas or buy it from the same source.

Plus, wouldn't mitsu tell you that you need to stick with the same kind of company if it can cause massive damage to the car? I've almost never been consistent with what company i get gas from in all 3 of my cars with no trouble ever

 

The company does not matter, it's the kind of gas like normal, premium, or super premium, it's not good for the car to be cycled through those.

 

ive heard its good for a car to have a tank of premium every 2 months or so...

 

Oh ok sorry about that when you said "brand" in a previous post I thought you meant the different companies. For sure it is a bad idea to switch octanes

 

I always use premium gas (93) .Get better mpg than with regular(87) ,+ car runs better IMO. Price? .74 cts /ltr (93oct) versus .70cts/ltr(87oct) not a big diference.I prefere Texaco but if not available then anyone will solve the prob. Switch a couple of times to regular because of a price reduction an d the car works fine, but feels best with premium.