Audi Repair Questions? Ask a Mechanic for Answers ASAP
Hello there! I'm Eurocar ! I will try to assist you as much as I can. Quality research = Quality answer!!
ok 3 of the codes pertain to timing issue, evap incorrect flow, and catalyst issues
these are as i pulled them
16825 - EVAP Emission Control Sys P0441 - 008 - Incorrect Flow - Intermittent 18354 - Control Module 1 for Coolant Fan P1946 - 004 - Defective - Intermittent 16804 - Catalyst System; Bank 1 P0420 - 002 - Efficiency Below Threshold - MIL ON 16814 - Catalyst System; Bank 2 P0430 - 002 - Efficiency Below Threshold 16395 - Bank 1: Camshaft A (Intake) P0011 - 008 - Retard Setpoint not Reached (Over-Advanced) - Intermittent
Readiness: 0000 0000
sorry that came out a bit funny
ok the timing issue needs to be addressed first
was there any other repair work done to the vehicle?
the belt was recently replaced and the timing marks are correct but im assuming your suggesting the chain?
possibly that you may have a high pressure fuel pump and camshaft issue where the lobe of the camshaft for the high pressure fuel pump and the follower has worn away
with that issue i can see where the power will be reduced and misfires also
did you remove the high pressure pump and inspect the follower and camshaft
Next on my list, would the wear to the lobe be clearly visable?
I intend on changing the chain and tensioner while im in there but is it possible the the cam phase adjuster or housing could be faulty?
if you are on stage 3-4 then the camshaft is no good and the follower and the high pressure pump is bad
possible especially if the follower is at #4 then metal is throughout the system
I see, would this throw up a timing fault? would i not excpect to see a fuel pressure fault?
then you will be dropping the pan to inspect and maybe replacing the oil pump and then you will be replacing the phaser adjuster and the timing control too which is the chain adjuster cover assy. there is a repair kit for that
it comes with the phaser the cover assy with the electric control
you will not see the pressure fault until the folower is at #4 and the stem of the pump is worn away and then the pressure will not go up to snuff then all kinds of issues occurs
sometimes i do see that the whole cylinder head needs to be replaced
I see, lots of work for me so! is the cylinder head replacement due to a lack of oil pressure?
yes correct due to clogging of the oil pickup screen and pump
you have a big task at hand here
so basically first step check the cam lobe and replace if necessary, check chain and allignment also?
yes correct note oil pressure controls timing!!
anything else you need to know?
I removed the oil pan recently and checked the pickup which was clean
coolant fan issue?
would i be correct in saying they have an issue with the control module?
replace both fans! the module is incorporated in the big fan and controls the small fan too. the fans has been updated to new and revised part #'s
Also my EVAP issue, when checking the charcoal canister I can suck and blow on both pipes, should there not be a check valve also could this give me the catalytic converter codes
replace the canister assy with the purge valve and the plastic hose that goes on top of the intake and the little bent hose that goes from the plastic hose to the canister purge valve. that will take care of the p0441 fault. revised and updated parts
need to resolve other issues and then retest for cats
the camshaft and the canister issues are technical bulletins and updates
I see thanks
where to start!