Rough Idle Question
#1
Rough Idle Question
I just recently changed out several parts on my 1997 4.6L F150 (spark plugs, EGR solenoid, DPFE sensor, and fuel filter). I also cleaned out the throttle body a bit, but my truck is still running rough at idle and speeds over 40 mph.
I don't have a check engine light on or anything, but it runs as if there is a misfire going on. Does anyone have any idea what may be causing this?
I don't have a check engine light on or anything, but it runs as if there is a misfire going on. Does anyone have any idea what may be causing this?
#4
Coils
#7
Before, the CEL was on and giving me a P0401 code (which is why I replaced the DPFE sensor). After replacing the sensor, the light went away but the engine still runs rough. Do you still think the coils could be the problem?
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#8
Senior Member
Sounds to me like it may be a converter. Do you have any power over 45 mph ? Like say for passing ?
#9
Senior Member
What kind of spark plugs did you use ?
#10
I used platinum spark plugs. Can't remember the exact brand. I just checked the MAF sensor and it doesn't appear to be fouled up or anything. I still have power over 45 mph, but it feels like the engine starts shuddering when it gets to those speeds. I'm about to have the oil and air filter changed as well since it's about that time, but I just want this thing to run smoothly.