Forum Discussion

bertha1989

Explorer

Aug 25, 2015

Need assistance for Ford 460 problem.

I have a 1989 Fleetwood PaceArrow John Deere 37J with a Ford 460 engine. Problem I have is that under load, the engine looses power and I can barely get 15MPH. At idle, the engine appears to run just fine. I thought it maybe the ignition module but was hoping to get some expert advice. Any advice would be greatly appreciated.

Class A

23 Replies

n7bsn
Explorer
Aug 25, 2015
I don't think there is a OBD port on an 1989/1988 model

I don't remember that chassis's fuel filter location. If it's"in the tank", I would replace the Fuel Filter, Fuel Pump, and tank level sensor. Hopefully then you will never have to drop the tank again.
bobman
Explorer
Aug 25, 2015
I'd try changing to a new fuel filter first
Big_Katuna
Explorer II
Aug 25, 2015
Sounds like the famous in tank fuel pump problem. The factory pump can't provide enough pressure at medium to WOT. When it drops below 40 PSI the ECM goes wonky.

My symptoms were the same.

The tank has to be dropped or cut a hole in the floor.

A decent mechanic can test it via the OBD port or by putting a gauge on the fuel line near the engine.