Thanks for the input. I tried the wd40 spray on the injectors and no
change in engine rpm, before I did the spraying I noticed the check
engine light was on. I have not seen this before. I ran the OBD check
and got 2 codes both for Lambda sound, o2 sensor I suspect. Checked
sensor output and it never changes from about 80 millivolts. Hard to
believe the Japanese one I bought on Ebay for 30 bucks was bad out of
the box and then the old original with 244,000 miles a short time
later goes south. Maybe I should have never touched the o2 sensor. It
was running well and I figured hey it can't hurt, they can't last
forever. Maybe I need to spring for the almost 200 dollar Bosch unit.
They guy said he would send another one when I send this back but now
I am spooked by what I believe is a NPK brand, not NGK like the
sparkplugs. It had the correct ends and length but the sensor part was
smaller.
I'm not referring to the injector seals leaking, but the injectors
themselves. When I started my EFI conversion, I had 11 740T injectors. 3 of
them were good and matched, one was good but about 5% high in flow, the rest
were leaking when closed or WAY off in flow, so it's not unlikely they could
use servicing.
Look online, there's instructions for testing O2 sensors out of the car. If
it's producing voltage I suspect the sensor is good, a very rich mixture
will stick the output at around .80 as well as make the idle rough.
You know, you might check the fuel pressure as well, I recently had the FPR
fail on my 740 and it caused all sorts of weird stuff, if it sticks closed
the rail pressure will be much higher, causing a higher flow from the
injectors and richer mixture.
