cyl air mass
07-09-2017, 11:52 PM
#1
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Location: LIVONIA MI.
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cyl air mass 2002 Z28 403 N/A forged int.4.005x 4.00 6.00 lift 224 dur. 447 rwhp 417rwtrq so i had to limp car home last night changed crnk sen. car now runs rich at low rpm lean at hi rpm 8.00 to 12.00 % up and down i dont think cnk.sen is it but cyl. air mass is down to 0.68-0.72 WOT AT 5000 RPM it was at 0.96-1.00 wot AT 5000 RPM POSABLE VAC LEAK AT INT.MAN OR ????
07-25-2017, 11:34 PM
#4
if no changes were made, then its obvious less airmass is present, which could mean a vacuum leak (registering vacuum at WOT, usually less than 97kpa at sea level), or a restriction in your intake tract. This is assuming the vitals are all good, I.E. o2s are registering correctly, Fuel pump is providing adequate pressure, all cylinders are firing.