2008 GMC Envoy Throttle unresponsive

190,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
ENVOYAGER
  • MEMBER
  • 2 POSTS
throttle unresponsive after engine rebuilt with a used crankshaft from the scrapyard.
Engine started giving a heavy sound. Mechanic said it was a big end bearing, so the engine was dismantled. Crank journal No 5 was worn out beyond grinding range and new crankshaft not available, so we took one from the scrapyard and assembled the engine. When the engine was started it was not smooth, so the mechanic said we change the cam sensor after which the engine ran smooth at idle but will not respond to the throttle.
We have had it checked by a computer guy, he said the electronic side was showing no problem. Please help.
Aug 13, 2014 at 3:50 PM
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Have it scanned for stored trouble codes. There may be an issue with the electronic throttle control.
Aug 13, 2014 at 7:44 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle