- View Profile: FrankR1

FrankR1 FrankR1 is offline

1st Gear

About Me

  • About FrankR1
    current car 2010S5 auto; prior, vette, lexus SC400, Caddy STS, Porsches. good mechanic for a lawyer
    Rappahannock County, Virginia
    golf, billiards and pool
    criminal defense lawyer
    Country of Residence


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Visitor Messages
General Information
  • Last Activity: 07-21-2019 10:35 AM
  • Join Date: 05-12-2016
  • Referrals: 0

Visitor Messages

Showing Visitor Messages 1 to 2 of 2
  1. 05-18-2016 11:49 PM - permalink
    Thanks, I will check for the vacuum leak, and check the plugs, and unplug the MAF; Idle is solid 600, no variation.
    I have noticed that, after I have run two tankfuls of 93 octane fuel through it with a can of BG44k in each tankful, it seems to be getting better. I did run a couple of tanks of 89 octane in it, after the manual said I could do that. But this does seem to be like a high maintenance lady....beautiful and really responsive, but demands a lot of high quality attention and stuff.
  2. ImTheDevil
    05-18-2016 07:28 AM - permalink
    There is a possibility you have a vacuum leak causing this issue, or also a dirty MAF that's creating problems. You can unplug the MAF and see if it still breaks up to get a feel for that. For a vacuum leak, usually your idle will be somewhat elevated over normal and if you can borrow a scan tool with live data reading, look at your fuel trims. Ideal is around 1, and if they're elevated (+10 or +15 etc) it would indicate the car is compensating for unmetered air by adding fuel. Unless you're at a combination of miles and usage that has you at the point of needing to replace all of your coils, I would look along these lines as you're getting issues on both cylinder banks. How are the plugs? They can be the reason for this, and if there is oil on them, you have a leaking valve cover gasket, which can also cause ignition problems.

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