Hey guys, I need a little help please. BIO: 1989 S-10, 4X4, 4.3L W/TBI
with about 160 K on her.
Problem is she keeps try to stall on me on the way home from the “salt
mines”. I drive the same route each day and she starts to fail at the
same spot during the trip home. The run is about 20-30 min total. All
but the last 10 min. are stop and go 40ish mpg. The last 10 min is
about 55 mph. At the end of the 55 mph run I stop for a signal. At
that same signal she falls flat and start to die. I can pump the gas
and still move but the last 2 miles she run like pooh. Does this sound
like a fuel filter maybe?
It’s just so weird at the same spot coming home. No prob. going to
EGR valve possibly, or EGR solenoid not closing the valve after you get off
the highway. The EGR valve only opens at highway speeds, when TPS input is
constant. So, during your final 55 mph run the ECM is opening the EGR valve
to lower NOx emissions, and as you get off the highway and come to a stop,
it <should> close the valve. If the valve is old and cruddy the pintle
could be sticking and hanging open, or the solenoid might not be doing it's
This causes a lean condition and will have her running like ass till the
pintle closes. If it were the fuel filter you'd be having problems at 55
mph as that's where the engine is sucking the gas, not at the end of the off
ramp when it's hardly using and gas at all.
Next time it happens, kill the ignition and turn her off. Let sit for maybe
5-10 seconds and then restart. Let's see if whatever it is resets itself.
That makes sense about the filter. I just change it today for hell of
it. It was a learning experience for my 18-year son so not all was
I checked the codes today. Yesterday was the first time I saw a Check
Engine light. It came up with a code 34. Does that match your
I really appreciate your words of wisdom Doc.
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