Intermittent pulsating idle, fuel pump occasionally doesn't turn on. After the engine has warmed up and driven a while I get a severe pulsation during idle. It almost seems as though it gets no fuel then gets a shot of fuel so the tach is "bouncing" up and down. Lately, twice I have had the fuel pump fail to turn on after shutting off motor. If I let it sit for a minute or two I can hear the fuel pump kick on and it will start. I know it could be one of several things but when the fuel pump started acting erratic I started to wonder. PCM? Fuel pump? MAF? Bad pump relay? What's your best guess. OH, when this first started, and still, I get a P0171 and P0174 code. Bank 1 and 2 running lean. Replaced plugs, fuel filter, pcv, cleaned MAF sensor, replaced air filter.
Jan 3, 2014 at 1:53 AM
