Hello all new to the forum, Just bought a 98 expedition from a fellow who could not get it to go up hills with any power. He had replaced the cat and new mufflers, alternator, and still no luck. I noticed the DPFE hose was burn and not connected so I thought easy fix. Bought the right hose and hooked it up and it blew the hose off after trying to go up a hill. The hose was fine but not connected. I blows a high pressure exhaust out the tube going to the DPFE sensor.

I replaced the Sensor and no difference then the solenoid took it for a short drive and the hose blew out as before and the new DPFE sensor nipple had melted. The exhaust pipe seems have little pressure.

Code P1405 and P1000.

I also own a 79 f150 without a computer.

Any ideas thoughts

 

What engine? The 4.6s have more trouble keeping the EGR passages clean. Just guessing, I would think you need to replace the egr valve and clean out the passages under the throttle body.

 

It is a 5.4 and I did check the EGR and it is fine. Did the vacuum test resulted in the engine dying while at idle. It idles fine.

 

 

discovered muffler was full of cat litter. Cut the pipe sounds like NASCAR goes up hills but a bit loud.

Andy

 

I suppose that means the cat has disintegrated.