Service engine soon light flashing when going up hill or highway

Asked by Jul 26, 2015 at 10:02 PM about the 2003 Chevrolet S-10 3 Dr LS Extended Cab SB

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.

2 Answers

100,235

As the light was flashing it should have set a code in the memory, so get the codes checked, write them down and then repost them back here and someone will jump in and help you with further diagnosis, most parts stores will do this for free. I have an idea that it maybe an O2 sensor.

1 of 1 people found this helpful.
51,805

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.

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