blade7

Having a hot idle issue, cold start, cruise and boost AFR's are all ok, but coming to a stop when the engine is hot the AFR goes to 16 or more and the idle starts hunting. Tried isolating the ISV and hot idle seemed to improve but AFR everywhere else was rich. Planning to pull the inlet manifold to check hoses and ISV unless anyone has any other ideas ?

shortyboy

i would check tps and any rubber couplers/hoses. Could have cracks and when hot, it would expose leaks.

blade7

Yes thanks. Probably do the throttle body seals while I'm there. Been having similar issues on and off for years in slow moving traffic.

GPA951s

Check the top or Throttle body the Idle Screw, maybe the rubber O ring is perished...Other than that.. Get about 15 feet of bulk silicone hose and look at LR website Good Vacuum Diagram.. 30 year old rubber.. Toss it.

Ski

TPS and check the vac hose under the throttle body, follow it back. Good suggestion on the Idle Screw o-ring as well.

blade7

Good suggestions. A while back I cable tied on all the small dia hoses I could see. Perhaps there's more out of sight.