What r the effects if u don't get your spark plugs changed

 

They will eventually one day cease to work. When this is, is anyone's guess.

 

But it won't damaged truck if u don't

 

They just get d^%$ difficult to get out. Its what keeps the Ford dealers in business. Oh, yeah and it starts missing and bucking like crazy. But its your truck, your money.

 

Misfires.

I thought my truck was running fine but when my friend thats a mechanic drove it he noticed it misfiring and pulled a pending misfire code from the computer. I had the plugs changed where he works at 95k.

 

horrid missfires, CEL's, bad gas mileage... all sorts of stuff can go wrong...

 

Why does it misfire around 45-50 mph, seem to run fine other wise. Dealer quoted me $900 to just change the plugs. Does this sound right?

 

Why does it misfire

 

$900 is because they are changing your spark plug which cost about $20-25 a plug through the dealership..which can talk up to 3-5 hours to change. And that's if nothing goes wrong like a plug breaking in the head.(which happens alot).

And if your truck misfires or bogs down between 40-50 MPH it's either your coils or plugs or both. Coils and run about $50! I'm guessing.

My 05 5.4 is doing the same thing right now. Already changed my spark plugs and made all the difference in the world. Now I think it's time to change the coils to stop the misfire and the bogging down at 40-50 mph

 

Quick story..

I bought my truck used in June from a GM dealer, price was right and it only had 65K miles on it, not too bad for an '06..They let me take it home for the night to test drive it since the finance lady was gone for the day when I went to buy it. I noticed when getting on the on-ramp to the highway that when I'd jump on it, it seemed to bog down like it wasn't getting fuel, then it'd sputter and all of a sudden kick down a gear and take off. I thought the tranny was slipping because when I got home it was low on tranny fluid. I had them top it off and it was still doing it. I had them look at it before I bought it, and the service manager (being the gear head he was) knew exactly what was wrong with it. He personally took it to Ford with a pressure test results. Both cats were slightly clogged and the plugs were fouled. They had Ford replace both cats and they changed the plugs..it cost the dealer about $500 for the plugs (cats were under a Ford Warranty) but that was even at a dealer cost just to give you an idea. The reason it cost so much is because they have two piece plugs from the factory and they do snap off in the head and become a bear to get out..

I guess that wasn't a quick story but it saved me a TON of money..even though I didn't have a truck for 2 weeks, they put me up in a brand new, fully loaded GMC Sierra (wasn't overly impressed with it, but that's another story lol)

Dunno if that helps but thought I'd share..