Running lean

[Rylee Serrano]

My 2001 explorer xls check engine light came on and I took it to auto zone and got it checked. they told me that both banks are running lean and to fix this I would have to replace the pcv valve. after I replaced the pcv valve that truck idled better but it is still pretty rough. I was wondering if there is anything anyone can think of that that wouldl help. I also replaced the fuel pump and fuel filter along with the pcv valve.

 

[XLTrunner]

I'd next be looking for vacuum leaks. Intake manifold gaskets are notorious for leaking...but, they usually show themselves with a rough idle when engine is cold and, when engine warms, the gaskets swell and idle becomes more normal. How about the pcv hoses? Clean the IAC and MAF sensors.

 

[SoHK_alumni]

Check fuel pressure.

 

[Rylee Serrano]

Update. I replaced the pcv valve and cleaned the ICA an MFA sensors and it is still running like crap. I bought the intake manifold gasket today and plan on putting it on tommorrow. I hope this fixes it. Thnk you for the feed back ill let you know if it fixes it.