How is it determined if a timing belt/chain is at fault or maybe spark plug/wiring & or plug or coil when there is (almost) continueous missfiring & the check engine symbol staying on, oftimes flashing? I bought the high milage '01 Audi A6 recently -148000 miles- but no idea how many miles on the engine-
a quick way to see if the cam timing is out due a slipped belt / chain is to do a cylinder compression test on all cylinders as they should all be within 10-15 psi of each other
if you have 2 that are down then this indicates incorrect cam timing
however Audi's and VW of this era do have an appetite for ignition coils and this is more likely given the amount of miles on the car
if you were to have the car plugged into a diagnostic tool this would show what cylinders are misfiring and so you'll know what coils to replace
when you do change coils I'd also replace the spark plugs at the same time as misfires never do them any good
Matt; I wasn't aware that my payment did not include your fee. My original question stated that I had a diagnostic check that indicated the #2 cylinder was at fault. I'd better double check my fee structure before asking any more questions!
Hello the site takes a deposit from you at the beginning and this is held by the site until you press accept at which point the cash is split between the site and the expert. so if my answers have been helpful please press accept.If you don't press accept then you can use the cash at a later date to ask another question.However you can keep asking questions on the same post as the process is supposed to a be a dialogue with information going back and forth to solve the problemSo to get back to your issue I'd suggest replacing the spark plug and coil on cylinder number 2 and also check over the wiring loom to the coils as there should be a earth tag thats bolted to the cylinder head so check that this is secure and tight as this is the earth for the coils
I am informed -by an auto parts store- that the referenced model dosen't use individual cylinder coils (only a single coil) and that cost is approximately $200.00 - I think that I will replace the #2 wire and plug, if I can access them and check the other wiring to the plugs - if that doesn't work I will have to take to a shop for compression checks & other. You certainly deserve a fee for your service & I'll double check how to get it to you. Let me know. Thanks, Floyd
Hellothat sounds like a good next step - also check the injector plug for that cylinder I'd check the condition of the injector plugs / connections as this could be a lean misfire if an injector isn't firing properly - the best way to check this is with a 'noid' light http://www.noidlight.com/ As for paying the fee, the site takes a deposit from you at the beginning and this is held by the site until you press accept at which point the cash is split between the site and the expert. so if my answers have been helpful please press accept.If you don't press accept then you can use the cash at a later date to ask another question.