Idle problems.

[Arben72]

I know this issue has been discussed before so i'm not going to go much in it. My car during warm up sometimes goes from less than 500 rpm to all the way over 1100 rpm. My car is a 2012 and I only run ethanol free 93 octane. I called my dealer to try and get this fixed and they told me it sounds normal (not to me). He told me without a check engine light he couldn't do much, but he told me to fill up with midgrade (89 with 10% ethonal) for 2 tank fulls and if that doesnt help to call them. I was wondering if this will do more harm then good and maybe if I should try another dealer?

[e1000]

Didn't know you could get ethanol free gasoline these days.

Do NOT fill 2 tanks with 89.

[Prince_of_Persia]

Do not use 89. It usually starts from 1200RPM and it settles between 500-700RPM. I think it is normal as long as it stays in this range.

[Arben72]

Originally Posted by Prince_of_Persia

Do not use 89. It usually starts from 1200RPM and it settles between 500-700RPM. I think it is normal as long as it stays in this range.

yes but it goes from 1200 down to roughly 400 back up to 1200 and repeats itself till I get on the accelerator

[Grail05]

sounds like its the gas... dont mix just use normal gas for a week or so... start on that first...

its funny how your complaining on this issue and looks like the answer is right under your nose.

[audioMeth]

Originally Posted by Sean05

sounds like its the gas... dont mix just use normal gas for a week or so... start on that first...

its funny how your complaining on this issue and looks like the answer is right under your nose.

he is using 93 so why are you saying its the gas? should he be using 104? i think you might have misread that first post

[Grail05]

Originally Posted by nuespeedgti

he is using 93 so why are you saying its the gas? should he be using 104? i think you might have misread that first post

Mixture of 89... Just a merely suggestion to not mix.... At this point... Stay and use one gas and should notice after a week...also I would also use another gas station.... A lot of things that can cause this at this point start with obvious...

If that doesn't work it might be the idle valve

But op mine did the same thing and it was my low pressure sensor

Just wait for the engine light to come on cause if your idle keeps going up and down at any time of day cel will show up soon

[Arben72]

Originally Posted by Sean05

Mixture of 89... Just a merely suggestion to not mix.... At this point... Stay and use one gas and should notice after a week...

If that doesn't work it might be the idle valve

But op mine did the same thing and it was my low pressure sensor

I don't mix fuels. My choices are 93 (ethonal free) 89 10% ethonal, and 87. None of those include mixing from different pumps.

[Grail05]

Originally Posted by Arben72

I don't mix fuels. My choices are 93 (ethonal free) 89 10% ethonal, and 87. None of those include mixing from different pumps.

89 and 87? Wtf that might be the answer

[Arben72]

Originally Posted by Sean05

89 and 87? Wtf that might be the answer

I think you misunderstood me. We have 3 pump choices. 93, 89, 87. I only use 93 *shell v power. At my gas station 93 is the only one that is ethonal free. My dealer is recommending me to use 89. 89 at my gas station has 10% ethonal.

[audioMeth]

dude, he isn't using 89 or 87, those are just the other choices at the pump. the dealer suggested using 89. the op was only using 93 non ethanol blend which i wish i had the choice for. is this bizzarro land or am i reading this thread wrong?

[Arben72]

Originally Posted by nuespeedgti

dude, he isn't using 89 or 87, those are just the other choices at the pump. the dealer suggested using 89. the op was only using 93 non ethanol blend which i wish i had the choice for. is this bizzarro land or am i reading this thread wrong?

No your 100% correct. Thanks for summing it up for me.

[Race_Doc11]

Same here. I was told it is normal however I started a new 2012 and it didn't do it....

Originally Posted by Arben72

yes but it goes from 1200 down to roughly 400 back up to 1200 and repeats itself till I get on the accelerator

[Grail05]

Wtf dude I know about the choices stop putting it in.. Lol okok I mis understood ...

Ok now since that's cleared if u haven't gotten a cel yet like I said it might be your ICV

Wait until u get the engine light if u get the p0172 and p0175 it will be your low pressure fuel sensor...

One question though is this every start up or just in the morning?

By the way normal is when your rpm is at 500 700 but when it goes up to 1200 not normal might not show right away but seems like your low fuel sensor is about to go bad or the worst ICV....

[audioMeth]

Op, if you do some digging i could swear they had a software update for this issue, maybe someone will chime in with a service bulletin. your idle behavior is not normal, if its been like this over more then one tank of gas then i wouldn't be thinking bad gas. fyi, as i am sure you already know this but dont use anything less then 91 the dealer gave you terrible advice.

[Arben72]

Originally Posted by Sean05

Wtf dude I know about the choices stop putting it in.. Lol okok I mis understood ...

Ok now since that's cleared if u haven't gotten a cel yet like I said it might be your ICV

Wait until u get the engine light if u get the p0172 and p0175 it will be your low pressure fuel sensor...

One question though is this every start up or just in the morning?

Ive only noticed it around start ups after it sitting outside for 8 hours during school. It's been getting progressivly worse. Today was especially bad and noticeable and i'm not sure if it's because it rained today. No cel yet but i'll scan for codes when I get one.

[audioMeth]

when my idle control valve went it generated a cel, it was more of a start to almost stall then cel type of event.

[Grail05]

Originally Posted by Arben72

Ive only noticed it around start ups after it sitting outside for 8 hours during school. It's been getting progressivly worse. Today was especially bad and noticeable and i'm not sure if it's because it rained today. No cel yet but i'll scan for codes when I get one.

This happened to me and found out later that it was a bad gas... But since u said its getting worst and specially on cold start I'm guessing its low pressure sensor don't worry just wait for the cel to come out... And if it doesn't come out its the gas... Your idle should go back stable once u get new gas....hope it works out ...

[Grail05]

Originally Posted by nuespeedgti

when my idle control valve went it generated a cel, it was more of a start to almost stall then cel type of event.

Yes usually it will but when one is about to go out this is usually the symptoms.. Hope it's not though let's see....

[Arben72]

It can't be the gas because this has happened during other tanks . We filled up our s550 at the same gas station within 10 mins of me filling up and it never had a problem. I'm guessing it's the idle valve control. It almost stalled out on me today and still no cel. It's probably going to be a wait and see thing. Hopefully no permanent damage.

[audioMeth]

i had my idle control valve and idle control actuator replaced on separate occasions, i wouldn't worry its a somewhat quick fix and common for these cars.

[EuropeanM3]

if it helps my 2008 ml350 does something similar and I think I remember hearing how it has to do with the engine needing to build up oil pressure or something :S