View Single Post
  #5  
Old 06-19-2019, 05:39 PM
97 SL320 97 SL320 is offline
Registered User
 
Join Date: Jan 2012
Posts: 7,534
As I stated in another post quoted below, 87 octane did not cause the car to have a run problem nor will it have caused any damage. Modern cars will reduce ignition timing to compensate for the lower octane.

The short story is take it to a competent shop and let them fix it, you will just be guessing and randomly changing parts.

https://www.peachparts.com/shopforum/tech-help/396561-2003-c320-running-rough.html

Old 12-19-2018, 07:34 PM
97 SL320
Registered User

Join Date: Jan 2012
Posts: 7,028
Quote:
Quote:
Originally Posted by TheBishop View Post
The last few drives in my wife's 2003 C320 I noticed it was running rough.

She told me not to put super because it cost more.
I found out she has been putting regular gas in the car for a year.

I fussed at her and blamed the cars condition on low octane fuel.

97 SL320 is online now

Better buy her something good for Christmas, regular fuel won't cause a rough idle. About all that will happen is a slight reduction of max power due to ignition timing reduction. At part throttle you won't likely notice a difference.
Reply With Quote