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Offline liamF

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new member old issue
« on: 02 September, 2018, 07:25:49 PM »
Hi forum peoples, first time poster and new owner of a 20,000 mile 08 A7  :123:. As a born again biker its perfect for me, comfortable with plenty of power,..... but...but it's got THE running issue of surging at 2-3500 revs, which I've been trying to solve for last few months with lots of help from here :084: :084:

Offline liamF

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Re: new member old issue
« Reply #1 on: 03 September, 2018, 03:32:50 AM »
Has anyone tried to balance throttle bodies?

Online Andy911

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Re: new member old issue
« Reply #2 on: 07 October, 2018, 09:45:43 PM »
Hi Liam,
Have the same issue, dead spot between 2,000 and 3,000. It will go through it if you wind it open but if you gently wind the throttle, no go! So annoying on such a good bike. Searched this forum but can find no definitive answer to hire to fix this problem. Anyone know the answer?

Offline liamF

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Re: new member old issue
« Reply #3 on: 08 October, 2018, 12:54:12 AM »
Hi Andy, I feel your pain, I've been trying to fix mine for awhile now just wondering if you read the posts by Happychappie? I found it had useful checks.

Offline richardcbf

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Re: new member old issue
« Reply #4 on: 09 October, 2018, 04:33:51 AM »
(No one ever said on their deathbed, "Gee, I wish I had spent more time alone with my computer." Danielle Berry.) http://hmpg.net/

Offline liamF

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Re: new member old issue
« Reply #5 on: 10 October, 2018, 11:56:08 PM »
Well Andy, hope you're having success with running issue, here' my few pennies worth:::
previously owned vfr so 1st job flapper + pair valve block but not much difference
2nd tightened chain + throttlecables----- took some lumpiness out
2nd tried Boosterplug [thanks Happie] flatspot mostly gone as ECU thinks its approx 20deg cooler than is, but still lumpy in
                                                                                                                                                                 slow trafffic 
what to do??? TPS sensor, MAP sensor, injectors, o2 sensor IAT sensor,,, fed up decided to invest in a diagnostic tool,
                        TPS works IAT works,o2 sensor reading rich, MAP sensor reading 55,65,75 4th TB goes to flapper
then tried o2 elim but made it worse
Next move power commander???
Decided with diagnostic to go back to begining, reconnected pair--- o2 sensor reading correct, opening pair allowed air to o2, lumpiness still in traffic but mpg improved 40-45
Getting tired and having throttlebody balancer from VFR what to lose???
connected carbtune and found all 4 reading different, with no2 lowest and a second behind others when revd
then with some difficulty made adj to make equal, fingers crossed went for spin----- MAGIC ----flatspot fully gone and lumpiness in traffic gone.
Everyone says don't touch throttlebody :431: but this has worked for me
                         
   

 


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