Service engine soon light flashing when going up hill or highway

Asked by 11chase11 Jul 26, 2015 at 10:02 PM about the 2003 Chevrolet S-10 LS Extended Cab RWD

Question type: Maintenance & Repair

my 4.3 v6 4x4 runs fine around town,
or in any slow conditions really. But
when I climb a steep hill and try to
go 55 my light comes on and I lose
some power, give or take a minute it
clears up and runs fine like nothing
happened and light turns off. Need
help on this have no clue what it
could be, I have cleaned my mass air
flow, changed plugs and wires, just
did a fuel pump and new fuel filter
and still acting up.

1 Answer
159,355

Bob answered 9 years ago

Have the catalytic converter(s) checked to see if it is plugged up. With a severely plugged converter you will have a big loss of power. Sometimes you won't get 55 mph out of it.

Mark helpful

Your Answer:

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