Thinking its the typical common intake gaskets leaks ??
Valve cover gaskets were done last year with updated Fel pro blue gaskets
Application:
2001 Silverado HD LQ4 6.0 with 150K miles
Already New fuel pump, New WIX fuel filter, AC/DELCO tune up, LOTS of fuel cleaner, DEEP cleaned the intake with Gumout+PEA
No CEL, But my creade code reader got a codes P0171 P0174 ??
Very bad idle-sputtering in cold start, then after 2-3 minutes ECM compensates, warms up and runs great ??
Also i think i'm going nuts crazy, But looks like no EGR valve gasket also ?? Gonna get new one at AZ today and pull out EGR and see whats up ??
Dave
Valve cover gaskets were done last year with updated Fel pro blue gaskets
Application:
2001 Silverado HD LQ4 6.0 with 150K miles
Already New fuel pump, New WIX fuel filter, AC/DELCO tune up, LOTS of fuel cleaner, DEEP cleaned the intake with Gumout+PEA
No CEL, But my creade code reader got a codes P0171 P0174 ??
Very bad idle-sputtering in cold start, then after 2-3 minutes ECM compensates, warms up and runs great ??
Also i think i'm going nuts crazy, But looks like no EGR valve gasket also ?? Gonna get new one at AZ today and pull out EGR and see whats up ??
Dave
Last edited: