5.3 Rough Idle - But No Ecu Code
I have 2000 Tahoe with 5.3 with 63k miles on it. For last 1,000 miles the engine idles rough when warmed up with tranny in drive. BUT NO "CHECK ENGINE" CODE IS TRIGGERED. Twice in last 2 weeks I have had injectors cleaned (at 2 different shops...one a Chevy dealer). The throttle position sensor (TPS) checks out OK. The Idle Air Control Valve above it also checks out OK. The fuel pump was also replaced because of unstable fuel pressure. The rough idle is better now...but NOT totally smooth like it used to be. ??? Again...NO ENGINE CODES TRIGGERED. Any suggestions?
|