Cold start trouble

gmc
sonoma

#1

Have a 2001 GMC Sonamoa. 4.3, 273,000 miles. Great truck, runs great. Kept up all maint. Recently have difficulty starting after sitting for a few hours. Tuned up this week, no help. Thinking maybe the fuel filter. Any sugesstions?


#2

Good thought on changing the fuel filter, and, then, check the fuel pressure.
Two possibilities (at least): the engine, at start is rich; the engine, at start is lean.
For rich (flooded condition), hold the gas pedal to the floor as you crank the engine, for up to 15 seconds at a time. As/if the engine starts, ease up on the gas.
For lean condition, at start, turn the ignition to RUN for 4 seconds, OFF, RUN for 4 seconds, OFF, RUN for 4 seconds. Attempt to start. Results?


#3

Thanks for the suggesations. I’ll give it a try and let you know.


#4

Sorry about my typing.


#5

Tried to start for both lean and rich. No luck. I’ll try changing the fuel filter next. (Maybe tomorrow) If nothing then, I guess she goes to the shop. Thanks for the info.