On a 1995 s-10 blazer would it cause it to run rich? It is a 4.3 motor I replaced the long block in my 1995 s-10 blazer with one from a wrecking yard. The motor runs but runs rough at idle and surges. I have checked all the vacuum lines, replaced the fuel regulator, replaced the cap, rotor, and spark plugs. I get no check DTC or FF codes.
CE light will come on and flash occasionally but will go off while driving it. I had just done head gaskets on the old long block and replaced all the gaskets so when I pulled off the intake all the gaskets looked good so I re-used them (probably not the best thing to do but anyway.). Vacuum is running low, around 15 in. I have checked timing. There is no washing in lower intake when I pull the plenum off. I spray with starting fluid around the manifold when it is running and it doesn't "smooth" out.
When I spray starting fluid directly into the air cleaner it makes the motor run worse, in part probably because it is already running rich.
Hopefully you can help me.
Monday, March 19th, 2012 AT 12:49 AM