I am getting jolting in low rev's and idle but when the revs get higher the problem goes i have replaced the spark plugs and coil pack anyone have any ideas

 

Need a VAG scan and report any code(s).

Does the jolting feel like misfires? One check is to idle engine and VAG-COM log Engine Block 15 to see misfires on Cyl 1 2 3 and Block 16 to see misfires on cyl 4 5 6.

Could be a number of things like incorrect gap plugs, intake boost leak, vacuum leak, dirty / failing MAF, ignition Power Output Stages on top of airbox, combo of failing EGT and front O2 sensors, etc.

 

think that is a misfire only happens in low revs or when the air con is on while idleing. i was thinking of getting a vag reader but not sure which is the best one to buy as none of the ones i have seen seem to advertise the a6 2.7t. our which is best a built in vag reader or the software that you put on your laptop? many thanks for your help.

 

Is your CEL coming on?

I work on several cars so I'm completely sold on the software licensed VAG-COM cable from Ross Tech, should be in the $230 to $350 range depending on your needs, or more $$ for the Pro kits.

VCDS (VAG-COM): Ross-Tech Store

You can purchase a cheap ebay OBD-II cable and use Ross Tech VAG-COM v4.09 (older version). Basic functionality for inexpensive cost for supporting your car but obviously does not have some of the new VAG-COM software updates.

 

not sure what the cel is i have no fault displays on the dash have taken the maf sensor off and checked for splits on the air intake the problem was there before i changed the coil packs and sparkplugs so dont thik that it will be that have ordered the vag com so hope that this will tell me somthing many thanks