Quote:
Originally Posted by Old Mechanic
It's rated at 34 combined on the new (more realistic) EPA ratings. I would hesitate to recommend replacing parts when you have no CEL.
If it was mine and I knew I was not getting the potenital mileage of that vehicle I would probably do what you are doing, making sure the maintenance is up to date, then I would probably replace the oxygen sensor if it was still falling short of my mileage expectations.
Your mileage quote was the original EPA, which was done at much lower highway speeds than 75 MPH.
EGR blockage will cause the ignition timing to be retarded which will affect mileage.
regards
Mech
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Thanks for the info....I am out in the garage right now, just finished adjusting the valves (which were a tad tight) and fixin to disassemble the EGR assembly right now as a matter of fact.
Very timely post as I was debating whether I was actually going to do it....after reading your post....I definitely am....then ignition timing is next.
I have another 5 wire heated O2 sensor I can try if need be. I built a DIY wideband O2 out of the 5 wire NTK L1H1 sensor that came out of my 95 Civic VX. I use it to tune A/F ratio on my Civic....it now has a 200HP 98 Spec Integra type R motor and tranny in it (wish I would have kept the original VX motor and tranny...but they were both whipped with nearly 250K miles on them)....but still...getting nearly 35 MPG out of my 200HP rocket. The car now has over 500K miles on it.
I can both test her sensor in my WBO2 meter as well as test my sensor in her car...should be able to tell straight away if they are both working correctly.
I may add another exhaust bung to her car so I can use my meter on it, that way I can tell for sure if I am in lean burn mode.
The Vout on the WBO2 produces a linear voltage which equates to air/fuel ratio.
How lean does the HX motor burn?...My scale only goes so far....but I guess I can interpolate if need be as the voltages are linear.
Vout: AFR:
1.40 10.08
1.45 10.23
1.50 10.38
1.55 10.53
1.60 10.69
1.65 10.86
1.70 11.03
1.75 11.20
1.80 11.38
1.85 11.57
1.90 11.76
1.95 11.96
2.00 12.17
2.05 12.38
2.10 12.60
2.15 12.83
2.20 13.07 - Max Torque
2.25 13.31 - Max Torque
2.30 13.57 - Max Torque
2.35 13.84
2.40 14.11
2.45 14.40
2.50 14.70 * Stoich
2.55 15.25
2.60 15.84
2.65 16.48
2.70 17.18
2.75 17.93
2.80 18.76
2.85 19.66
2.90 20.66
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4.00 Free Air