Flashing ses light when run hard but no code stored

03zr288

New Member
I have an 03 zr2 5spd s10 4.3 poor performance runs good on level ground but when you start up a hill it falls on its face but its like u take your foot off the gas and if you down shift and run hard like around 3500 to 4000 rpm ses light will flash and engine will get a dead miss but when u level out the miss goes away and no code stored any help would be appreciated

Parts changed

Distributor
Plugs and wires
Maf sensor
Fuel pressure regulator
Fuel filter
Catalytic convertors
Muffler
Intake gaskets
 

TollKeeper

Well-Known Member
How are the O2 sensor readings? Do you have a screen shot a voltage levels?
 

Mooseman

Moderator
Can you get live data and watch the misfire counts?
 

TollKeeper

Well-Known Member
25% on the LTFT? WOW! Something is out of wack.
 

Mooseman

Moderator
I'm surprised it's not throwing a lean code. You may have a vacuum leak, may be related to P0446.
 
OP
OP
03zr288

03zr288

New Member
I never figured the evap would cause it but i got the but i got the canister solenoid today and purge valve going to change tomorrow and see what happens let yall know something thanks for all the replies
 

budwich

Well-Known Member
you have a "major issue" on the B2 side of things as the LTFT on that side are way different from the other side. Could be a sensor issue on that side but a graphical reading of the voltages would be easier to tell if the sensor is functional as opposed to "static" digital read out. You are going to "saturate" your cat on the B2 side if you don't quickly remedy the problem.
 

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