95 ford f350 7.3 diesel. check engine light comes on intermittently and goes into a lope idle. Runs rough and won't go over 40 mph. I think it's some kind of sensor maybe the map sensor any thoughts?

SOURCE: 2002 Ford Focus

you will have to read the diagnostic code that the computer is sendig for the check engine light to activate

Marvin

• 85242 Answers
• Posted on Nov 23, 2008

SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger

Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..

SOURCE: Ford Focus Engine problem

have you tried having your fuel injectors cleaned on it. the engine might not be getting enough gas at take off. it might also be that your gas tank fuel pump or the other fuel pump going bad

SOURCE: runs rough when cruising at 35-40 mph

try pulling off the air breather hose and look inside at the mass air flow sensor,it looks like a wire with a diode hooked to it incase you didnt know,see if there is any fuzz on it,sometimes the air filter will lose small pieces and the mass air flow sensor catches it.If that doesnt work then you may have a fuel problem,weak pressure,causing the mass air flow sensor to read too much air so it tricks the computer to adjust the issue.

Jim DuBreck

• 578 Answers
• Posted on Oct 14, 2009

SOURCE: My 2001 Ford Escape runs rough before it warms up.

Well, fords are known for multiple O2 sensors... so I would have Autozone do a free diagnostic to see if

1. it really is an O2 sensor - and which one
2. eliminate the power feed to the injection/choke circuit.

Testimonial: "Excellent idea. Thanks"