Engine roaring

wilkind1_181376
Fri, 01 Jul 2022 19:55:04 +0000
Maintenance/Repairs

Ok. So I have been dealing with an engine roar on my 08 f-150. 4.6 liter. Ive cleaned the throttle body. Replaced bank 1 cat converter. Changed all plugs and coil packs. Valve cover gaskets due to leaking on coils causing misfires. Fan clutch thinking that was my roaring issue. Changed passenger side exhaust manifold and gasket. Which was blown. Im still dealing with the issue. I know everything screams exhaust leak. So i will explain exactly whats happening and hopefully someone smarter than me can help. Because im running out of ideas. I also smoked tested entire vacuum system. Everything’s good. On a cold start up. I will get the engine roar on the passenger side of my engine. Only sometimes it will do this. Wont do it for a couple of days, and then it will do it for 2 days straight and quit again. Here is the odd part to me. I will drive home from work and after being on the highway for about 45 minutes going 70 75. I will exit to get on the feeder. I will come to a complete stop at the light. Then on take off i get the roar again up until 45 mph. After that the roar goes away and all is good. It will come back when i come to a complete stop sometimes and sometimes it wont. Im hoping someone has dealt with this or may have an idea of where i need to look next. Because its driving me crazy that i cant figure it out.

17 posts - 9 participants