IAC valve problems

IAC valve
IAC valve: It is in charge of regulating the air flow into the engine when the throttle is closed or idling.
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When I smoke the motor smoke comes out of my Egr and iac SolvedSolved

Ford F-150 1999 5.4. 4x4 232000 miles
Smoke comes from the Egr not gasket issue it's coming from under the top part where vacuum hooks up to also smoke comes from iac looks like it's coming from the little round part on side and also from unit itself.do these parts suck outside air or are they leaking. Also truck has code p0171 lean on bank 1 that I can't figure out. Any help would be appreciated. I also started the truck and tried the o propane gas bottle and carb cleaner and sprayed it around both WITH no change in motor running. Not sure what to do next except change plugs injectors and coil packs and see if that will solve my p0171 code.
Joey from United States 4 years ago  
JO
2 reports 
Solved
Best answer (according to Joey)
wolfnhogs from United States 4 years ago
I just had this problem as well. I took truck into garage and had intake gaskets replace new hoses and new intake. This cured my issue. Certainly something you may want to have looked into. Job was a little expensive but it was well worth it and I got a great deal on it. They found my intake was cracked, the tube behind intake had somehow broke and was leaking coolant, My truck shook at idle and take up with little power. This job can cost at much as $2000 but it was 1/2 cost at my local garage. I just got truck back and Its like its brand new. Good luck
Joey from United States 4 years ago
Thank you I smoked the motor again and now have no visible leaks anywhere and we smoked it good so now I'm thinking I've got bad sensors.
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4.2 v6 won't idle and hesitates at low rpms.

Ford F-150 1998 4.2l v6 2wd 277000 miles
98 f150 4.2 v6 5 speed. Will start and run as long as i stay on the throttle. If i let off the throttle while the truck is not moving or clutch is depressed, it dies. Sometimes when i go to accelerate, or at partial throttle, it and feels like it's being choked but when i get on the throttle or I'm completely off the throttle, it runs just fine. I replaced egr and cleaned the tube as best i could but wasn't able to clean the entire tube. After doing this the truck cranked and started to idle like it supposed to, but soon as i started driving, the problem persisted again. I cleaned the IAC and… Read complete
Jbear2086 from United States 2 years ago  
JB
2 reports 
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