1987 Chevy S-10 Rebuilt engine break in time

REBUILT

MEMBER
1987 CHEVROLET S-10

Engine Performance problem
1987 Chevy S-10 6 cyl Front Wheel Drive Manual 175K miles

Hey I have a Chevy S-10 pickup 2.8L 6 cyl that was recently rebuilt. It has 63 miles on it (on a rebuilt engine). When driving it at 10-30 mph it performs fine. When I drive it at 40-50 MPH when I gear down from 4th gear to 3rd when exiting the highway it stalls and then I have to restart it. Engine seems great (good rebuild) I took it to my mechanic and he said that when trucks engines are rebuilt they experience a "Burn in time" where the engine gets used to the fuel injection system or computer control. I was wondering if anyone else experienced this problem with a rebuild. The car drives fine besides that, idle seems good. How long does it take before the stalling goes away? And it there anything I should do in Particular for the first 500 miles I drive it on the new engine? Any tips would be appreaciated. Is this a common occurance for rebuilt engines?

Thanks - Josh

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,268 POSTS

Actually, there is a break in period, but the engine dieing when you down shift isn't part of it. I would check to make sure all vacuum lines are on and not disconnected. Also, I would recommend changing the oil after the first 500 miles to remove any dirt from the rebuild. Run it easy for the first 100 or so miles and try to avoid full throttle acceleration for the same amount of time.