wow no engine stated in an engine post.
2.5/2.7 and my guess, 3
.6 liter, 252 hp (188 kW) V6 ????
sure, that is
random misfire. there vast causes,
each misfire is dejected by weak power from 1 or more cylinders.
in this case, many.
we find them by doing tests. with real tools. and meters.
in physics its just about 3. compression, spark or fueling bad.
300s means that all or most cylinders are misfiring, .
- never getting a tuneup is top reason now for 100 years. endless story of folks not doing service. for sure at 60k miles.
- bad spark. (opps see #1 )
- lean or too rich air /fueling ratios. flooding or bogging lean , you never stated driving issues, hows it drive?????
- EGR stuck open.,
- CEL LAMP stuck on ,driver ignoring it?
- Scan tool attached, and the mech fails to see lots of DTC errors, not just P0300.s ?
- bad oxy sensor, in such a way that cause, #3
- bad MAF sensor, not dead, just weak. or just needs cleaning.
- Any illegal air leaks to this engine will cause lean outs.
so any mech would use his scan tool and look and PIDs
live data.
is engine getting to 180F OR MORE and holds,(ECT PID)
is engine in closed loop at idle, yes/no,
if no, fix that first.
ok yes,
is LTFT near 0, or most run about -5% is it?
if LTFT is way off, or the car has over 100k miles, try 2 new
oxygen sensors B1-S1 and B2, S1, to 2 top sensors, in gringo talk.
or in tech talk, both upstream sensors
my guess is its not the 02 oxy sensors. but is
A/F wrong
or bad spark
and #1 all time hit , is never ever tuned up..not in 7 long years.
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