The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.
Car Problem Reports
Chevrolet Monte Carlo Check Engine Light Due to Vacuum Leak in EGR Tube
Chevrolet Monte Carlo Problem
Exhaust & Emissions Affected: 3.8L V6
Average Mileage: 104,500 mi (55,000 mi - 142,000 mi)
my monte carlo has the check light on and dosn't run the way it should the code says i have a vaccum leak how can i find it ?
Visitor, 2003 Chevrolet Monte Carlo, 99,000 mi
CHECK ENGINE LIGHT IS ON HAD IT CHECKED VERY THING IS FINE DON'T UNDERSTAND WHY LIGHT IS ON