I have a '95 Honda Civic VX, D15Z1 VTEC-E engine, 174,000 miles. It runs roughly, acceleration and mileage are poor. A timing light shows that when I snap open the throttle, the timing briefly *retards* about 10-15 degrees, then returns to initial (16 deg BTC) as RPM stabilizes.
Testing on another Honda (same year, diff. model) showed the expected advance. Mine retards.
The timing also does not advance as RPM increases gradually. I see slight variation, 1-2 deg, as I slowly increase RPM, but it always stays around the initial setting. Behavior is same in neutral or top gear (front wheels off ground).
MAP and throttle position sensors test 100% normal. TDC, crank angle, and CYP sensors (in distributor) pass resistance tests. Distributor is original but ignitor and coil have been replaced recently. A different ECU did not solve the problem. This engine does not have a knock sensor.
What could cause "backwards timing" that I haven't checked?
Thanks for the help!
2007-05-28
10:02:01
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10 answers
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asked by
Mr Efficiency
2