1998 Ford Expedition is it a miss?

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.

3 Replies

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

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

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