Worked on O2 sensor now car will not start
I have owned my 91 ZR1 since 93. Today I decided to cut some
solder splices from an extension added to the right side O2 sensor wires many years ago.
I had added 18 inches or so to the sensor wires in order to rerout the wires around the headers
I installed back then. The solder had corroded green underneath the heatshrink and began to
crumble. My plan was to cut them out and replace with crimp splices. I read somewhere that
solder does not work well with O2 sensors.
In any case, the car started as normal, I drove it onto my ramps, shut off the ignition and went to bed. Next day (today) I slid under, cut out two of the six splices and then remembered I had not
disconnected the battery. I unhooked the negative post and then completed my splice replacements.
When I went to start car to remove it from the ramp the starter engaged as normal but no
start. Starter tuning engine but will not fire.
Since then I have checked: ECM shows 12s only no other codes, CCM codes C12 only (good?), no CCM ERR message, spark is good, added 5 gallons fuel, all fuses in main and aux panels good,
replaced the MEMCAL chip with a spare that was working when I took it out, and charged battery.
On each start I can hear fuel pump run for 2 seconds so I assume FP relay OK. Both FPs and all
FP and tank system filters were changed last fall. I removed schrader valve cap and pushed
valve release while son cranked the starter. A small amount (half teaspoon) of fuel dribbled out without much force. Attached fuel pressure guage and it reads zero PSI while cranking.
Sounds like a fuel issue. Here are my questions:
Could clipping 2 O2 sensor wires with key removed but battery attached cause this
or is it just a coincidental failure?
If I can hear the fuel pump run for 2 secs how can the fuel pressure be zero, assuming
my test guage is working properly. After many start attempts today I never smelled any fuel
in the engine compartment or anywhere else.
If I mucked up the resplicing somehow wouldn't the car at least start? O2 not part
of start (open loop) parameters until idle (closed loop) if I remember right. The car
should start even if they are unplugged.
Remember the car started perfectly prior to my rewire project. It really seems that
something I did caused the no start. I just can't figure out what it is.
Thanks for any help. Unfortunately I do not have a scan tool.
Neil in Ft. Walton, FL
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