My 2001 Chev Silverado 1500, 5.3L, 260,000 K miles may finally be near the end - but I wanted to see if anyone here has seen something like the following first:
It has been running great until this week. I live in Portland - weather was down to about 10 deg F a few nights and when it warmed up again the trouble started. After starting cold and driving for about 15 minutes it starts stalling out. Sometimes it will fire right up again and I’ll hardly notice except for a momentary drop to 0 on the tach. Other times I’ll have to pull off to the side to the road and restart it. However, 2 times now it would not restart and stay running. It would either fire up but then die within 10 seconds, or it would just crank. Both those times it did restart successfully after 40 minutes had passed total and it drove fine afterwards until I got where I finished my commute (about another 5-10 minutes of driving).
I took it to a mechanic who could see it stall but was not able to duplicate the 40 minutes out of commission thing. His fuel pressure gauge indicated that the pressure was fine during the stall outs. The mechanic ran the computer diagnostics but didn’t see anything unusual. He wasn’t really sure what the problem was. He recommended replacing the fuel pump and fuel filter anyways - but couldn’t say if that would make any difference.
Has anyone seen this kind of problem? Should I start throwing money into new parts or move on and start looking for a new vehicle?