Alright, so I disassembled my air intake today to get to the throttle body. I planned on cleaning the throttle body with some spray specifically made for it, and it seemed to do a fantastic job. Anyway, with the TB clean and such, I reassembled the air intake and started the truck up. Two problems: now the Service Engine Soon light is on [the two sensor wires are in place, i assure you], and when I'm driving it, it shifts a lot harder that it did twenty minutes beforehand.

Any ideas here? I'll take it to Advance tomorrow to get some codes if it doesn't magically disappear.

*Note: The TB cleaner is quick-dry, so I'm pretty sure the TB and Intake manifold were completely dry.

 

Did you push the throttle plate open by hand? The proper way to do it is to turn the key on and have someone push the gas pedal to open the plate. Unless you have throttle cables. I do not know what year your truck is the above is for cable less throttle bodies.

 

Don't think it has anything to to with the throttle body in this instance.
Your throttle is not electronically controlled.

If the SES light cam on while you were driving it, I'd almost bet that you have a code thats somewhere between P1740 and P1900 in number..

 

Please either state the year of your truck when you post or put it in your signature so that we can help you out.

 

Sorry. 1998 K2500 with the 7.4L Vortec.

The SES light was on when I started the truck after cleaning the TB, not while driving.

 

well, there was a cleaner ones that i used, M2 or something, that choked my Honda after throttle cleaning. took about quite some time for it to evaporate, before it'd start.
i'd guess it sucked some of that "quick dry" wonder into the system and caused some havoc.

unless, of course, you messed up something.
hey, is MAF sensor sealed and connected? on mine, there's 5 connections between throttle body and air filter box, either one can go bad when moved and not re-installed back just right.

 

I only disconnected the intake from the TB, so the other connections should be pretty solid. I'll update this post or another after I walk outside and start her up, to see if the problem is still there.

EDIT: I rechecked all the intake connections and such, and the SES light has turned off; I haven't had a chance to drive it to see if the tranny is still shifting hard.

 

Just so its out there, after the SES light turned off from rechecking my intake connections, the tranny started shifting fine again. I have no clue why they're related, but as long as things are working correctly I won't worry too much.

Thanks for the input guys; this one kinda just worked itself out.