If you've read the build thread you know the Zinno Cabrio is doing great. If you haven't read it dont read this :p
I've put about 3k on the car since getting it back on the road and that includes 2 trips to Florida of about 1200mi @ so its mostly highway miles. I recently started getting a CEL only at idle and after the car had been out for a good run. It starts, runs, idles and drives perfectly so I figured it was probably a sticky oil pressure warning switch since its due for a change and the light always goes off the instant I hit the gas.
Since the car just turned 100k I figured I'd throw in an O2 sensor just because. I reset the DME with a battery disconnect and took off for Florida. Everything was great except my highway mileage (calculated AND per the OBC) had dropped from 25 to about 22 and it has stayed there. Keep in mind Im comparing 2 trips on the same route within month with no other changes.
Today I pulled the codes..which I didnt think I could do on a 7\87 build..and I got a 1222 (Lambda Control). This does not indicate an O2 fault but rather an O2 input issue. In going through the list (you have to read the build thread to know how long that list is), the only thing that I have not recently removed, replaced or adjusted was the CTS so I ordered a Bosch today from Amazon Prime for $14.
I also took a VOM to the O2 sensor and did not get voltage at the harness side of the heater wires which I should, and the O2 Heater Relay seems to be ok which suggests a break in that wire which could be fooling the O2 sensor in to running rich, especially if the CTS is off. I havent checked the diagrams to see if the heater should be kicking in at cold start and in running it for a few minutes I got resistance readings at the O2 sensor in the .25 range with no change with revs or the oil cap removed.
Other than retesting the O2 sensor after a good run am I missing anything..or should I try putting the old sensor back ?
I've put about 3k on the car since getting it back on the road and that includes 2 trips to Florida of about 1200mi @ so its mostly highway miles. I recently started getting a CEL only at idle and after the car had been out for a good run. It starts, runs, idles and drives perfectly so I figured it was probably a sticky oil pressure warning switch since its due for a change and the light always goes off the instant I hit the gas.
Since the car just turned 100k I figured I'd throw in an O2 sensor just because. I reset the DME with a battery disconnect and took off for Florida. Everything was great except my highway mileage (calculated AND per the OBC) had dropped from 25 to about 22 and it has stayed there. Keep in mind Im comparing 2 trips on the same route within month with no other changes.
Today I pulled the codes..which I didnt think I could do on a 7\87 build..and I got a 1222 (Lambda Control). This does not indicate an O2 fault but rather an O2 input issue. In going through the list (you have to read the build thread to know how long that list is), the only thing that I have not recently removed, replaced or adjusted was the CTS so I ordered a Bosch today from Amazon Prime for $14.
I also took a VOM to the O2 sensor and did not get voltage at the harness side of the heater wires which I should, and the O2 Heater Relay seems to be ok which suggests a break in that wire which could be fooling the O2 sensor in to running rich, especially if the CTS is off. I havent checked the diagrams to see if the heater should be kicking in at cold start and in running it for a few minutes I got resistance readings at the O2 sensor in the .25 range with no change with revs or the oil cap removed.
Other than retesting the O2 sensor after a good run am I missing anything..or should I try putting the old sensor back ?
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