02 F250 with a miss

[skyhammer]

I just purchased a used 02 F250 Super. Ive had it 3 days. 5.4 l. 77,000 miles. I filled it up with 93 and added Luca oil injector cleaner. It was fine. Last night I sprayed out under the hood trying to wash some farm dust off. Didnt run it. Today its missing badly. No codes. Any ideas where to start?

 

[flareside_thunder]

It's missing and didn't throw any codes? Are you basing that off of the fact that the CEL hasn't illuminated or have you actually hooked a scan tool up?

 

[skyhammer]

Well I havent hooked it up. Im just watching the dash at the moment. I live miles from an auto place. I was hoping for an easy answer but thats not my luck haha.

 

[blacksnapon]

Usually, whats happened, is you've got water into one (or more) of the spark plug wells, causing the plug to arc through the moisture. Solution is to remove each coil individually and blow out the water with compressed air. Then put a dab of dielectric greas in each of the boots.

 

[skyhammer]

Hey thanks. I do hear a slight tick like an electric arc. Thanks men. I will post my results!

 

[skyhammer]

Thats what it was. Thanks guys. I appreciate the help tremendously!

 

[flareside_thunder]

Figured it was something simple and I'm glad it was.

 

[lil_dq]

Glad I could help! LOL