Re: 2.5l major issues please somebody help me :(
Working on a friend's truck with similar issues: 2001 Ranger 2.5L. Shakes at idle but does not stall. It will drop down to about 400 rpm then jump up to 3000 and then smooth out, such as it is, and repeat in a minute or so.
We cleaned the MAF with MAF specific cleaner, replaced the IACV, cleaned the throttle body, checked the air filter, replaced the fuel filter, replaced every vacuum line that we could find, replaced the PCV and its grommet, changed the oil & filter, pulled a vacuum on the EGR (no leak down), checked the spark plugs, replaced the O2 sensor (in front of the CAT), and pulled our hair out.
We had the exact same experience as others when we used brake cleaner to spray the injectors so we:
1) replaced the PCV, its grommet and its hose (seemed the spray might be going in around the PCV and it was something we could do in the parking lot)
2) replaced the injector o-rings because we still heard the engine rev when we pointed the straw directly at the base of the injector #1
I was thinking next we would do the intake manifold gasket as that is a common problem on some of the other engines, especially the 4.0, and we still get a lesser but distinct increase in RPM when we point the straw of the brake cleaner can at the intake manifold gasket right at the #1 injector.
Last edited by WadeLovell; 01-13-2012 at 10:40 PM.