My truck as been sputtring lately and it back fires every now and then and it has a rough idle. I also have lost power to so does any one know what that could be? it also has 162,000 on the motor if that matters.

 

Year and Engine?

 

1999 4.6

 

Does it have a check engine light? Probably just a misfire. When was the last time plugs/wires have been changed, if ever, on the truck? This would be a good place to start. Otherwise, a possible COP or coil pack is bad. A little more info would be helpful, I'm just shooting in the dark.

 

Theres no check engine light on i changed the plugs and wires about a year ago. If this helps any my check engine light was on 3 months ago but that was for the o2 sensors i changed them but i didn't change for 2 months if that makes a difference.

 

it could be a maf sensor problem... if it back fires, that means a lean air/fuel mixture..
just my 2 cents

 

But remember, he doesn't have a CEL...and I would almost think that if the MAF had an issue, you'd be getting a light. That of course could be wrong though...If if has lost power, is there a chance of a clogged cat or something? Again, I would think that would throw a light though.

How did the truck run before/after you changed the plugs and wires? Also, did you use Motorcraft plugs and wires on the truck? I've heard a bunch of horror stories about people trying to save a few bucks and putting just regular joe-blow plugs/wires in these tritons, they really seem to not like them.

 

The truck ran fine i just started havin problems after i replaced the o2 sensors. I only use motorcraft thats all my truck hs ever seen its even had motorcraft oil all its life for 161. Do you think somthins wrong with the o2 sensors? cause i don't have my check engine light on. How can you tell the cat is clogged?

 

i just recently had a sluggish truck so i replace the spark plugs witch cleared it up for awhile but it came back... so last night i replace all the C.O.P and the truck runs like a champ now!!! all this happened without a CEL.. so i guess it could be a coil problem.. not getting a full burn could cause it to back fire...
stephen

 

could also be a injector problem... you could try seafoam through the gas tank and suck some through the brake booster line and see if that helps!!!
stephen