Problem with my 89 460 E350
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Problem with my 89 460 E350
Hey guys, i just bought a Winnebago with a 89 Ford 460 engine, stock as far I can see. I took it for a spin (400 miles) and I'm floored by the mileage. Now I know 460's aren't know for fuel economy and the rig is heavy and built like a square sail but @ 6.5 MPG without a trailer seems there might be an issue. Lots of noise and vibration on acceleration at and around 55 MPH. Once warmed up, there is some knocking coming from the cat. I'm thinking it's a blocked exhaust issue. At idle it runs great so I'm hesitant to start pulling plugs. It only has 50K miles so it's sat most of it's life. Could a cat fall apart under these conditions? I haven't measured the exhaust pressure yet. I was going to buy the OCT back pressure gauge but it's almost 300$ on Amazon! Any advice would be greatly appreciated! I want to put some miles in come the fall. Hope to get the mileage up to 10 but I'll settle for 9!
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