98 Expedition issues

joey3002 · 08-31-2009, 10:50 AM

Im really hoping someone can help me. I will try to explain everything.

I have a 98 expedition w/ 98k miles on it. I am experiencing a few things probably related. When I pull out and say I floor it. It runs hard but has an obvious lack of power. You can feel it pull out hard, but then it pulses like its surging for more power but just cant do it. The other issue just started happening. When I come to a stop, it wants to stall. It drops to 200RPMs and really struggles to stay running. Once I go, its fine just does that surging thing till I come to the next light.

Oh, before it started to want to stall. It felt like a misfire. Like every few seconds when I was sitting at a light I would feel a little "bump" Like it just missed something..

I have replaced plugs already...

I have no warnings on the computer (i have a reader to check the ecu in case its a burned out bulb..)

Please someone help me.. What should I start looking at?

99Expy · 08-31-2009, 12:13 PM

Check your egr valve and all related hoses, they tend to dry rot out at about the mileage your at. What else has been done engine wise, clean throttle body, replace fuel filter, replace air filter? Is it a 4.6 or 5.8? Anything different with the exhaust, possible closed or crushed catalytic converter?

joey3002 · 08-31-2009, 12:21 PM

Quote:

Originally Posted by 99Expy

Check your egr valve and all related hoses, they tend to dry rot out at about the mileage your at. What else has been done engine wise, clean throttle body, replace fuel filter, replace air filter? Is it a 4.6 or 5.8? Anything different with the exhaust, possible closed or crushed catalytic converter?

new fuel filter, new air filter. its a 5.8. I had 3 broken manifold bolts and they were removed and repaired. 2 new exhaust manifolds were put on.

Any hose in perticular?

thanks

TBIRD430 · 08-31-2009, 02:37 PM

Have you owned this vehicle since new?

Maintence means everything here (power & MPG robbing deposites build up over time).

joey3002 · 08-31-2009, 02:38 PM

no.. bout 5k miles ago..

TBIRD430 · 08-31-2009, 03:40 PM

Is there anything recorded in the owners manual? Any paperwork in the glove box, etc?

joey3002 · 08-31-2009, 06:58 PM

nothing in it

TBIRD430 · 09-01-2009, 01:28 PM

What type of vehicle did this Expedition replace?

joey3002 · 09-01-2009, 01:30 PM

Quote:

Originally Posted by TBIRD430

What type of vehicle did this Expedition replace?

It was/is a 3rd vehicle

0007 · 09-16-2009, 07:58 AM

This may not be the best answer but I have a Hanes book for my 97 and in the front of the book there are several problem solving answers to many issue. Its helped me out pretty much everytime. Just a fyi.