98 expedition

Asked by Jan 17, 2015 at 11:38 AM about the 1998 Ford Expedition 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

I have a 98 expedition when I bought it the
muffler had a hole in it, so it was welded
now it shakes when I drive it back fires, and
sucks gas like crazy the check engine light
is on and when going up a hill it goes really
slow it only picks up speed on the highway,  
I changed the 1 coil pack that I was told
was bad, put a new starter and new break
lines now I just can't figure out what's
wrong with why is it backfiring, and reading
check engine and shaking so much, and
why is it losing so much gas

12 Answers

10,580

possibly a clogged catalytic converter.

7,590

can we get the service codes read and reported ? can we get basic fuel tests with the pressure, volume and reaction of the fuel regulator? High quality parts must be used, and labor is expensive when it's skilled, lets get some testing for indications, or we cannot help. Your system preckecks ask for visual inspection before pinpoint tests.

7,700

Yep ... I agree ... Catalytic converter. You would be amazed how many times that problem is misdiagnosed . One lady even had her transmission repaired.

Best Answer
7,590

If that was true it would fail some simple tests, what are they ?

765

you might try taking your car to Auto Zone. They will usually read the check engine codes for free, then you will have an idea of where to start.

7,700

Strange that the CEL, ( Check Engine Light) doesn't lite for Clogged Cat ... However I know for a fact of a 2003 Grand Prix that had an almost completely blocked Cat and the lady came in reporting the Trans was going crazy up shifting-downshifitng ..when she tried to go faster then 25 MPG ... and no CEL

7,590

Some causes of plugged catalyst cause trouble without setting a code. in the early 90's there were heavier pickups and flatbeds etc that did this. I had to lay on the ground between stalls and clean the cats so the truck owner could work to make his payments. Then I had to dothem all again when their parts arrived 2 weeks out. The engine management malfunction was the cause. treating the symptom got expensive as you could add up. "hell of a price to pay for what they like in california" But the correction and its diagnosis are better since OBD II

7,590

So, if you had a plugged catalyst ? What tests would you run ?

7,590

Suspected plugged catalyst i should say since it is likely a $1200 whim

7,590

since the asker is not interacting, i suppose she is seeking a correct professional diagnosis with proper testing................ there's no app for your phone on this one,

7,700

There is a "long-shot" cat repair It is possible to burn the coating off the cat that's preventing it from reacting (won't work on lead coating) or even clearing partial blockage. You can lean an engine by artificially inducing a high voltage from the O2 sensor ( no higher than .6 Volts dc (6/10's of a volt). This will set the engine to run lean and the heat will incinerate the unburned buildup. Of course this device must be assembled by an electronic geek because it has to pulse or the computer will reject it.

7,590

we havent verified any codes or run any tests yet. We do not even have results of a visual inspection. Neat suggestion though.

Your Answer

Add photo

Related Questions

Expedition

Looking for a Used Expedition in your area?

CarGurus has 24,893 nationwide Expedition listings starting at $1,999.

ZIP:

Search Ford Expedition Questions

Ford Expedition Experts

#1 T_S_T
T_S_T
Reputation 1,730
#2 oldtimer37
oldtimer37
Reputation 1,210
#3 lightGear
lightGear
Reputation 1,010
View All

Related Models For Sale

Used Chevrolet Tahoe
807 Great Deals out of 28,674 listings starting at $1,500
Used Ford Explorer
1,001 Great Deals out of 73,800 listings starting at $750
Used Chevrolet Suburban
495 Great Deals out of 18,928 listings starting at $1,400
Used Lincoln Navigator
105 Great Deals out of 5,670 listings starting at $1,299
Used Ford F-150
2,878 Great Deals out of 212,656 listings starting at $1,000
Used GMC Yukon
552 Great Deals out of 17,369 listings starting at $1,995
Used Cadillac Escalade
288 Great Deals out of 10,687 listings starting at $1,900
Used Dodge Durango
330 Great Deals out of 24,233 listings starting at $1,500
Used Ford F-250 Super Duty
427 Great Deals out of 45,049 listings starting at $2,000

Used Cars For Sale

2017 Ford Expedition For Sale
3 Great Deals out of 11,973 listings starting at $31,990
2016 Ford Expedition For Sale
76 Great Deals out of 2,091 listings starting at $26,977
2015 Ford Expedition For Sale
45 Great Deals out of 1,325 listings starting at $22,711
2014 Ford Expedition For Sale
41 Great Deals out of 842 listings starting at $15,995
2013 Ford Expedition For Sale
70 Great Deals out of 1,008 listings starting at $14,988