i have 97 f150 4.6 and ive been having a diffrent spark plug misfire every two weeks i also get code for insuffeceint egr flow ive replaced my spark plug wires and spark plugs dont know what to do. i get a slipping feelin when the misfire occurs also have service light on. mechanic says replce egr valve but im tired of replcing parts with no result, thanks

 

What are the codes and what have you replaced?

 

p0401 egr flow insufficeint and i have replaced my alternator to 120 amp spark plug wires with 8mm bosch exhaust with 3 inch flowmaster and two of the spayplugs that misifred mechanic said other ones looked fine

 

was alos wondering about using seafoam to clean everything out help me please

 

P0401 is a very commonly discussed code. Please SEARCH keyword "P0401". EGR Valves are very seldom the problem.

Specify what brand plugs and wires you used.

Punctuation and sentence structure are important to convey technical details. Please consider using them.


Steve

 

Alternator won't have anything to do with a miss.
If you have no codes referring to a miss, the problem is the EGR operation.
Insufficient flow is a plugged exhaust channel, bad or dirty EGR valve/ sensor.
Take that system apart and clean to be sure the flow is unrestricted, then see what you have.
Don't chase ignition for an EGR indication.

 

I am having the same problem and it is always the same cylinder #3. Facing the engine where would that be? Left or Right 1,2,3 or 4 from the front of the enigine. This is on a 1998 F150 4.6 V8. Thanks

 

Sgt Zeke, Your problem is most likely due to coolant leaking down from the heater hose above number three cylinder. To fix the leak, replace the clamp on the hose and tighten it securely. Number one cylinder is on the passenger side at the front. They run sequencially front to back, 1-4. Number 5 is at the front of the driver's side. Hope this helps.

Robbie

 

i carried it today to have the entire system as in the fuel system cleaned and flushed and light went away for now ....

 

Thanks Robbie that is everything I hoped for and more than I would get from the dealer or the local repair shop. It would also explain why it would reoccur after a period of time. I will check out tonight.

Mark