Is the contribution test the same as the "hit/tap" test? A local shop did that on a laptop to mine and I could hear number 8 not responding as the other 7 did. I'm finding that my Edge wasn't very helpful as a diagnostic tool. When my FICM was going it would show random cylinders not contributing, then ALL 8. It never hinted that the FICM was about to take a dump. It didn't show transmission codes when that went south either, go figure on that one...

 

I'm using my AE software... For the contribution test it show rpm difference...

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And for the record that not a newer escort! I'm talking 91-92. Lol

 

Sorry for the resurrection of a 5 year old tires but this really applies to me. OP, did you figure it out? Thanks

 

Could be a plugged cat. If its that down on power youve got some issues.

My truck with a bone stock tune, AFE filter and mbrp 4" straight pipe will easily brake torque 37" Toyos and run it out to about 65-70 feet.