It's time I make a post to try to figure out what is going on with my wife's 2005 Mercury Sable. I'm at the point where I am afraid I am throwing money at it and don't want to go further down that rabbit hole unless necessary.
(Quote from another post I made asking questions about a vacuum line) For a little bit of background information: She has had the car for a few years now but recently started throwing codes P0302 & P0316. If I clear the codes it doesn't throw them again unless it's been sitting, usually after sitting all weekend. You can feel it misfiring and running rough at cold start but once it warms up the misfiring goes away and runs/accelerates very smoothly. I had to change the valve cover gaskets so I also replaced the coils, plugs, intake manifold gaskets and cleaned the EGR while everything was apart thinking that would solve the problem. Everything runs smoother than before, almost like new, but after sitting it's the same problem, 302 & 316.)
Fast forward to the last few weeks it was running rough randomly. Usually when I first start it up after coming out of a store. Yesterday I got a code P0171, which I read was Fuel Trim System Lean Bank 1. Cleaned the MAF with MAF cleaner. Reinstalled the MAF this morning and the car started fine. We drove to the gas station and it started fine afterword, but the idle was a little rough. Went to the grocery store on our way home and when we came out and started the car the idle was very rough. If I gave it any gas it would die. It would start back up but idle really roughly and die. I let it sit for about ten minutes then started it again to find that it had a rough idle but would run. Drove home fine with no CEL on at all.
I really figured with it running that rough and stalling it would have thrown a CEL for something but no. I could not find any visible vacuum leaks but plan to spray some MAF cleaner around once the rain stops. My next step was going to be ordering new fuel injectors but I wanted to hear some feedback before I keep throwing money at it. Any help you can offer would be greatly appreciated.
(Quote from another post I made asking questions about a vacuum line) For a little bit of background information: She has had the car for a few years now but recently started throwing codes P0302 & P0316. If I clear the codes it doesn't throw them again unless it's been sitting, usually after sitting all weekend. You can feel it misfiring and running rough at cold start but once it warms up the misfiring goes away and runs/accelerates very smoothly. I had to change the valve cover gaskets so I also replaced the coils, plugs, intake manifold gaskets and cleaned the EGR while everything was apart thinking that would solve the problem. Everything runs smoother than before, almost like new, but after sitting it's the same problem, 302 & 316.)
Fast forward to the last few weeks it was running rough randomly. Usually when I first start it up after coming out of a store. Yesterday I got a code P0171, which I read was Fuel Trim System Lean Bank 1. Cleaned the MAF with MAF cleaner. Reinstalled the MAF this morning and the car started fine. We drove to the gas station and it started fine afterword, but the idle was a little rough. Went to the grocery store on our way home and when we came out and started the car the idle was very rough. If I gave it any gas it would die. It would start back up but idle really roughly and die. I let it sit for about ten minutes then started it again to find that it had a rough idle but would run. Drove home fine with no CEL on at all.
I really figured with it running that rough and stalling it would have thrown a CEL for something but no. I could not find any visible vacuum leaks but plan to spray some MAF cleaner around once the rain stops. My next step was going to be ordering new fuel injectors but I wanted to hear some feedback before I keep throwing money at it. Any help you can offer would be greatly appreciated.