Help !! - rough idle / lack of power

[williammoore]

a Couple of weeks ago my 1996 Explorer 4.0 sohc started running really rough on idle and the power on acceleration is now really bad + its drinking gas - like 10 mpg. One day it would not start - but eventually got it going but keeping my foot right down and the gas pedal. It also used to stall alot.

Ford say there are no codes in computer to say whats wrong and they are stumped.

I've changed the plugs and leads. Changed the throttle body, cleaned the MAF and IAC and still no luck.

so far my bill from the garage is $700 and still no further forward.

Can anyone help me.

Willie

 

[Rhett]

Did you check the fuel pressure regulator? How about the O2 sensors? You would think that the truck would give a code..but not always

 

[williammoore]

Replaced both the o2 sensors about 4 months ago (unless one of them is dodgy)

 

[Rhett]

But what about the fuel pressure regulator?

 

[williammoore]

ok going to check that thanks - also could it be anything to do with the timing (chain tensioner ) ???

 

[monkeydude3]

check the intake manifold O rings!!! I have heard a lot about the 4.0L OHC leaking at these places and causing it to run lean. this would cause the problems you describe, and not neccessarily throw a code.

George

 

[Rhett]

a Couple of weeks ago my 1996 Explorer 4.0 sohc

I just noticed, you have a 1996 SOHC. In the U.S., that engine wasn't introduced until 1997.

 

[williammoore]

No it is a 4.0 sohc (its a late 1996) but classed as a 1997 model), Will also check the O rings - Thanks