Greetings F-150 Experts!

I have a 2001 Supercrew, 4.6L, 4sp O/D. At the beginning of my drive to work (54 miles) this morning, I noticed a sort of bumpy feeling when accelerating through 30 MPH. Almost a vibration. I pulled over to check the engine and it was running smoothly. I didn't notice it again until the ride home in traffic. Pretty much at low speed and when the transmission was changing gears. I checked the fluid, per the manual instructions. It is fine and didn't smell burnt. I continued my drive and in a few miles, the "Service Engine Soon" light came on.

I plan to take to a shop in the morning but does anyone have an idea what happened or could be causing this? Seems like a transmission issue but would that cause the light to come on?

Thanks,
Steve

 

We won't know till you get the code, but I'll guess a misfire.

 

Thank you for the quick response!

To get the code, I can just take it somewhere like Auto Zone, right?

 

Correct

 

just to clarify for you. normally a serious transmission issue will make the o/d light flash.

 

I'm gonna take a guess - PO304

 

correct, PO304 it is.

I have dropped off at a hopefully, fair, repair shop. I will post the diagnosis. As soon as I know.

 

Hahaa , lucky guess .

Good luck

 

Well...it's defined as a bad coil on #4 and they are going to replace that, plugs & caps. Also do a fuel service because with the bad coil, extra fuel was being supplied to the other cylinders and fouling the plugs. They say.
There is a coil for each plug? I guess I'm "old school" thinking there is "a" (single) coil that supplies a distributed voltage to the plugs.

I'm in a rental until tomorrow sometime.

Thanks for the feedback and information!

Steve

 

Not true - the injectors continue to pulse normally , no adjustments are made. - raw fuel continued to dump #4 cylinder which fails to ignite therefore collecting in the converter.

After a prolong period of time , the PCM may shut down the injectors (all of them) in an attempt to preserve the catalytic converter, it could ignite - I not sure of the time frame.



Yes, 8 coils within your Coil on Plug (COP) system..