Car is a 1997 C5 with a A4 trannie
Owner got sucked into the performance mods scheme and the end results is car failing smog, low performance and engine runs like junk
After so called hot mods like yanking the screen out of the MAF,
playing a game with intake air temps by moving the IAT sensor into the aircleaner, head works, CAM, headers, injectors, etc the owner went to Advanced Dyno in the Sac Ca area for one of those hot dyno tunes.
Car did not run well so owner then pays Newtech also in the same area for another custom tune. Car still runs like crap go he goes back to Advanced Dyno and gets tuned again !
Owner takes car in for EPA I/M 240 smog testing that includes testing at 15 and 25 MPH on a threadmill. Car fails both tests.
Owner contacts us and we have him meet up with one of our teammates who does a testrun with a Ease scanner recording all engine functions.
We analyze that data and find the engine is running very poor including way too rich for all NON WOT conditions, idles too high and engine timing jacked way up.
Owner sends us the PCM and we download it to analyze the tunes that had been done. Here is just a few of examples of lousy tuning.
The C5 owner has gone through hell as 2 so called pro tuners charging high prices jerk him around and in the end had to start all over again to get a custom tune from us.
In reviewing the Ease scanner data found was all sparkplugs hand tightened, wrong push rod lengths, bad front 02s and totally incorrect tuning. Note :
the values in red in timing tables is the amount in degrees that was added over and above the stock values