Question about 2005 Ford Expedition
Changed the ingnition coil #8; spark plug and wire for # 8 compression test good, no white smoke from exhaust - no smells from exhause. car rides rough when idle - hestitates on excelleration. engine skips on freeway!
A misfire code is set because one of three things is missing or not right: spark, gas, or compression. You checked compression and it's good, equal to the other cylinders? And there is spark on #8? That leaves a fuel problem, then. How does the spark plug look on #8- if the appearance is white, almost a blistered look to the bottom of the plug, that is an indication of lean running- not enough gas in the mixture at that cylinder. You may have an injector problem on #8.
Posted on May 12, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: vehicle came in for check
A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.
Posted on Jan 30, 2011
have the crank sensor check for erratic operation. if you have done all of that then there is nothing else. and they way the computer knows it is misfiring (if it is) false code maybe and could be bad crank sensor. good luck
Posted on Oct 25, 2009
Tips for a great answer:
Feb 24, 2015 | 2006 Ford Explorer Eddie Bauer 4x4
Dec 16, 2013 | 2004 Toyota Tundra
Dec 19, 2011 | 1996 Lincoln Mark VIII
Jul 27, 2011 | 2004 Ford F150
Jan 14, 2011 | 2000 Ford Expedition
Sep 04, 2010 | 2004 Dodge Ram 1500
Dec 06, 2009 | Dodge Durango Cars & Trucks
Jun 25, 2009 | 1998 Pontiac Bonneville
161 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: