So my truck is unhappy lately. 2001 5.4 runs rough when it's below freezing. I have replaced the iac and cleaned the maf. Plugs have been done. I'm at a loss and about to drive this thing off a cliff. Any ideas. I know someone has had this problem before. Help a brother out
Intake manifold gaskets? Does the 5.4 have intake manifold 'gaskets'? I just did them on my sisters 4.0 exploder. Had the same symptoms. Sent from my iPhone using Tapatalk
Yeah, on the exploder it creates a vacuum leak that deals up when the o rings expand , just like you suggested. I think you're more correcter ha ha. Vacuum leak. I think if the intake manifold leaks, it leaks coolant which creates a misfire that won't go away. That's what happened on Denny's 5.4. Sent from my iPhone using Tapatalk
Thanks fellas. Tired of messing with it. Going to the shop on wednesday to have it looked at. Weird thing is it only does it when it's below freezing otherwise it runs like a top
You have a summer truck. Maybe get a Ranger with steel heads for winter ??? Galaxy S4 Cetane Powered Android