Weird doin's today.... I've been driving the 225 miles each way between Columbia and Atlanta with the MS set on AutoTune and trying to maintain a steady rpm rate over the course of each trip to tune the VE table. Each trip I have saved the .msq so the resulting data is averaged over a long trip.

Today, near the 200 mile mark, I tried to accelerate from 75mph and got an immediate strong lean surge/bucking pattern, followed by a backfire that sounded like it came from the exhaust manifold. Several times of this and no change. I looked at the VE table graph and saw some mountainous peaks in the graph above 100 kpa where the ECU tried to call for more fuel by adjusting the VE value.

Needless to say, I did not save the .msq and thought perhaps there was an exhaust leak - maybe at the manifold flange.

When I restarted 6 hours later under the prior .msq, the engine ran fine - even after it warmed up to operating temperature.

Strange...... really strange. <img src="/forums/images/graemlins/confused.gif" alt="" />

Charlie - ever see this?

Frank