2001 chevy Blazer 4wd vin W 4.3

Question

P0171 P0174 P0300  would a timing chain off 1 tooth cause this problem, NEW long block csfi injectors intake and plenum gskts twice map,maf,temp crank,plugs cap wires and new dist fuel pump???

Answer 1

Hi there

It is possible, these are lean codes which are likely causing the misfire code. It can also be caused by intake manifold leaks, possibly a sticking EGR valve and at times I have seen plugged converters cause a lean mixture because the exhaust is going back into the cylinders.