1998 Ford Expedition is it a miss?

Tiny
ZBUCK_1
  • MEMBER
  • 1998 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
When the rpms get to around 1300-1600, the engines feels like it has a terrible miss. Below that range or above it. It is not that bad at all, sometimes not even noticeable. I have changed plugs and even a couple of coil packs that looked like they might be bad, but it hasn't helped at all.
Monday, February 22nd, 2010 AT 10:52 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi zbuck_1@yahoo. Com, Welcome to 2carpros and TY for the donation

Your probable causes-Inspect and test all the following listed below:

Oxygen sensors.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Fouled/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Monday, February 22nd, 2010 AT 11:35 PM
Tiny
ZBUCK_1
  • MEMBER
  • 2 POSTS
Kinda generic answer isn't it? Not much help. :(
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Tuesday, February 23rd, 2010 AT 10:20 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
One of this components will cause your problem I suggest you check it top to bottom and get back with some testing results so that we can continue, remember were not there with the vehicle your my eyes here-Misfires can be hard to deal with-could be compression/fuel or spark problem
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Tuesday, February 23rd, 2010 AT 1:23 PM

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