Msufan

Hello everyone, new to the forum and I have found tons of great information! Bought a 2003 F150 Supercab XLT back in 2010 and after a couple of weeks I noticed a slight rough idle after the truck would warm up.

Well a couple months later it threw a check engine light and one of the cylinders had a misfire. Well all the plugs and coil packs were changed and it still had that rough idle. I then had a fuel system treatment done (was skeptical of the treatment even doing anything) and I noticed a slight improvement.

I have checked the PCV valve, checked for vacuum leaks and cleaned the MAF sensor. My mechanic who I have known for years and is very reputable in the community says he thinks it idles fine.

I found a ford service bulletin (01-24-8) that talks about feeling a shaking in the cab on certain trucks that have the seat belts integrated into the seats and they say its normal.

I have searched the forum and found some similar issues but not quite the same. Is there anybody with the same problem? Anything else I can check?

It is just a slight shake (more pronounced when in drive) but it bugs me like crazy. I take pride in my vehicles and want them to operate as they should. Sorry for the long post but I am looking for answers or to see if anybody else is in the same boat. Thanks!!

j.low

Sounds like the throttle body needs to be cleaned. Remove air intake tube, soak a clean cloth in WD-40 (or?) and clean all around the butterfly.
Good luck.



'97 4.6 scab 2wd, 205,000 good miles.

Msufan

I was looking after I posted and that thought came to me as well about cleaning the throttle body. I will have to give that a try. I really like the truck so far other then the idle.

After looking on this forum for a while I have found a lot of mods to spend more of my money on lol. Just ordered a super 44 Flowmaster today, been wanting that for a while, next is either a cai or a gotts mod and a new radio and speakers.

97offroad4.6l4x4

had the same thing. oxygen sensors. the ones closest to the manifold.

Msufan

I cleaned the throttle body today and it didn't seem to do much. Did your truck throw a code for the O2 sensors or was it a matter lets try this and see what happens? Also did you do them yourself and if so how much were they and how easy are they to get to?

97offroad4.6l4x4

It threw the code but there real cheap and worth replacing. Woth a tool its easy but i couldnt get it with a wrench. Had my mech do it