I'm back again with more VX problems - sorry to say.
Right after I changed the L1H1 oxygen sensor about 6 weeks ago, she ran great - for a while. A couple weeks ago, I started to feel a bit of initial stumbling on acceleration. That's worsened to where it's a persistent miss.
Under even moderate acceleration I can feel frequent misfiring. The little girl just ain't got much go. Even in neutral, I can hear the miss in the exhaust note when I punch her throttle.
I have no CEL codes.
The exhaust smells odd. I'm not sure how to describe it.
Plugs (also ~6 weeks old) have some loose black carbon on the bases, just above the threads, but not much on the tips.
O2S also has a bit of carbon at its base, but the tip looks good (I think).
Ordinarily I'd suspect fuel delivery problems, and to be honest I don't recall when I last changed the fuel filter. However, the missing happens only after she's warmed up. When cold (and in open loop), she seems to run fine, suggesting something in the engine sensors or control is at fault. (Or am I wrong about that?)
ICM and coil were new a couple of months ago, just before the O2S. I didn't install them, however, so who knows what went in there?
New cap and rotor just after that.
TPS is smooth over its entire travel, no bumps or jumps, with resistance ranging from something like 2-3k to about 4.5k.
I just changed the MAP sensor. That was $75 for nothing.
Timing light seems to show the distributor advance working, though I haven't tested it in gear with the wheels off the ground yet.
Could the replacement ICM be causing this? Any other possible culprits you can think of?
I appreciate the coaching. Thanks guys.
Threaded Mode
