why does my truck still stall after a few miles or days?

2001 CHEVROLET S-10
117,896 MILES
Avatar
DEDMISTON
  • MEMBER
  • 2 POSTS
Recently replaced fuel pump after finding that there was not enough pressure at the test port (also replaced fuel filter with pump). Drove around the block after repair and truck stalled but then restarted very sluggish. Due to the mileage I noticed the cat had never been replaced so I pulled to front 2 O2 sensors and checked the cat. Part of the inlet of the cat was melted and cause blockage. Removed and replaced cat with new one. Now the truck drives better but will stall without notice. Right before it stalls i hear it begin to start poping (lean out) before it dies. I have checked fuel pressure and intake mainfold for leaks, but now I'm stuck and don't know what to try next or where to start...
Nov 14, 2011 at 7:28 PM
Advertisement
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
So you replaced one of the manifold cats?Now is the fuel pressure good when it stalls out and gives you trouble?You should really do whats called a back pressure test when its acting up.You could have more then one cat that is clogged up.A back pressure test measures the pressure in the exhaust to see if its ecessive.
Nov 14, 2011 at 8:09 PM
Avatar
DEDMISTON
  • MEMBER
  • 2 POSTS
No i replaceed the cat (the truck only has one and not on the manifold). I checked the mainfold for a leak with brake clean while it was running. the fuel pressure is good all the time. i lose spark when it starts to dies but when i unhooked everything to hook up my noid light it showed i had spark i hooked everything back up then it started and ran fine . For a little while at least then begins to act up again.
Nov 15, 2011 at 2:57 PM
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
So your loosing spark when it dies?Do you have any codes have you checked for codes?
Nov 15, 2011 at 5:39 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.