StormH2Oguy

A few weeks ago I posted regarding a surge in RPMs that I am getting when cruising along at 35-45 mph. I am going to replace the throttle body and see if that clears up the issue. The vehicle is a 2008 Suburban LTZ with 60k miles so I am sure the throttle body could use a good cleaning anyway but since the TPS is a part of the throttle body I figured I'd just replace the whole thing.

My question is, has anyone done this and what is involved with removing the air intake system and the throttle body itself. I am mechanically inclined and have all the tools but have never messed with the throttle body. I have read that I need to disconnect the negative battery terminal so that the PCM can relearn the correct idle. Is that all that is necessary or will this also require a scan tool or reflash by the dealer to accomodate the new throttle body. No DTC codes have been thrown and that is why I haven't taken it to the dealer yet. My experience with them in the past is that they only know how to fix vehicles if a code has been thrown and a TSB is published for the issue. They are not very good at figuring things out on their own and I'm not going to leave the car there for 2 days only to be told that everything is operating normally. (Enough of that rant for now!) The new throttle body was $83 and if I can fix it by myself for that price I would prefer not to take it to the dealer.

I ordered a new throttle body and gasket from RockAuto and it will be here tomorrow and I plan to tackle the job then. Any tips will be appreciated.

Thanks,
StormH2Oguy

73shark

Not sure what led you to a throttle body replacement on a relatively new truck but a thorough cleaning should take care of it.

As far as the surging goes, I'd check for vacuum leaks.