Rough idle
Thread Starter
Newbie
Joined: Jan 2007
Posts: 10
Likes: 0
From: San Jose
04 c230K
Rough idle
Here's the story. About hours or so ago my "add oil msg came on". So I went to pepboys and got a qwart of 0w40 mobile 1 synthetic oil and added it to my car. Drove around for a while. Came home for a while. Went out for an hour at the driving range. As I was driving home the engine started to idle rough, still had power but when stopped it hunts from 500 to 1000 rpm. What has happened? If I change my oil am I ok or am I going to need to reset something. I have no malfunction msgs. Help
MBWorld Fanatic!
Joined: Jan 2006
Posts: 3,212
Likes: 8
From: Pasadena, CA
2002 C230K, 2013 BMW 328, 2015 BMW X5
Why oh why do I get myself drug into this?
Your post is essentially worthless in helping to understand your issues.
What does your hour out of the car have to do with helping you diagnose your problem?
Come back with material information as it pertains to
a. do you see any leaks on the ground after you park the car?
b. have you investiaged leaks in any of the intake tract?
c. have you checked on any of the vacum hoses?
d. have you checked with a code reader to investiage DTC codes?
e. is your flux capacitor attached in active?
Some of us enjoy helping. So lets dial in. How long was it to your last oil change. Hase our car been serviced, or tampered with recently. The poor idle suggest a vacum leak, or a closed idle problem. I, from an arm chair don't see how the two issues are related. But, please do check the color of your oil, just to be sure, and get your codes checked at an autozone. PM me to *****, or provide real info.
E
E
Your post is essentially worthless in helping to understand your issues.
What does your hour out of the car have to do with helping you diagnose your problem?
Come back with material information as it pertains to
a. do you see any leaks on the ground after you park the car?
b. have you investiaged leaks in any of the intake tract?
c. have you checked on any of the vacum hoses?
d. have you checked with a code reader to investiage DTC codes?
e. is your flux capacitor attached in active?
Some of us enjoy helping. So lets dial in. How long was it to your last oil change. Hase our car been serviced, or tampered with recently. The poor idle suggest a vacum leak, or a closed idle problem. I, from an arm chair don't see how the two issues are related. But, please do check the color of your oil, just to be sure, and get your codes checked at an autozone. PM me to *****, or provide real info.
E
E
MBWorld Fanatic!
Joined: Dec 2005
Posts: 1,055
Likes: 50
From: SoCal. Desert
'16 E350, gone: '03 c230k
Adding the oil probably has nothing ot do with the rough idle. Worst case is that you overfilled - check the oi llevel via the display (see owners manual if you're not sure how to do this).
See the other threads about a rough idle, and throwing engine codes P0301, P0302, etc. Seems like it's a common thing for a $12 hose to go bad. One other clue if this is the case is that when you shut the engine off (try shutting it off with the door open to hear better) you can hear a loud 'breathing' noise coming from the engine - which is not there when the hose is fine. when mine was bad, the car would seemingly run just fine when driving down the road, but idled rough and the idle would also oscillate (hunt) bewteen 500 and 1000 rpm.
It could also be as simple as a dirty MAF sensor.
If you're under warranty, take it in. If not, there's been lots of posts/write-ups pertaining to this over the past 2-3 months.
See the other threads about a rough idle, and throwing engine codes P0301, P0302, etc. Seems like it's a common thing for a $12 hose to go bad. One other clue if this is the case is that when you shut the engine off (try shutting it off with the door open to hear better) you can hear a loud 'breathing' noise coming from the engine - which is not there when the hose is fine. when mine was bad, the car would seemingly run just fine when driving down the road, but idled rough and the idle would also oscillate (hunt) bewteen 500 and 1000 rpm.
It could also be as simple as a dirty MAF sensor.
If you're under warranty, take it in. If not, there's been lots of posts/write-ups pertaining to this over the past 2-3 months.
