[s-cars] S4 hesitates , stumbles at elevation

[Jerry Scott]

I had the same thing happen in my 93 with stock coils, going up hill with 
full throttle and at 12,000 ft. elevation.  This stress brings out the 
weakest of the coils, with intermittent firing on the weak cylinders.  You 
might be better off going back to new stock coils or maybe the Corvette LS2 
conversion.  I assume you are talking about a UrS4.
Jerry
----- Original Message ----- 
From: "George Verbryck" <georgeverbryck at yahoo.com>
To: <s-car-list at audifans.com>
Sent: Wednesday, September 30, 2009 3:03 PM
Subject: Re: [s-cars] S4 hesitates , stumbles at elevation


Well I have gotten several replies for coil failure as the suspect. This 
unfortunate as the coils are the newer 2.0t coils for 06+ cars.The new style 
coils are beefier and bigger but I guess have not fully addressed the 
problem yet. I was trying them out in hopes I would not have to replace the 
whole coil system again . The plugs were changed at the same time with the 
NGK Iridium. I bet they do not have 5000 miles on them . I have the Apikol 
coil harness. Again on flat land I have no symptoms, I guess the extra umphh 
of passing uphill exposes coil failure quicker. In the meantime I can just 
wait for it to get worse, great. On the bright side it was still a great 
drive and I do not live in the mountains so I will not have to be 
dissapointed everyday. Regards, George




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