Question about 2004 Ford Freestar
I have a 4.2L van that misfires on Cylinder #2 which causes the van to buck and jerk upon acceleration. The mechanic hooked it up to his scanner which detected over 16000 misfires on that one cyliner. He checked the compression of this cylinder which is fine. The spark plugs and wires are brand new. The coil ohmed out fine. The problem seems to be somewhat intermittent but bad most of the time. In fact, upon acceleration you can press on the pedal to a certain point and get the car to buck and jerk more. The Throttle Position Sensor has been changed with no affect. Two Ford Dealers and two private mechanics have not been able to diagnose the problem. Do you think it might be the coil even though it ohmed out fine? The van seems to idle fine. Anyone with any idea of what else to check or what the problem might be? Thank you.
Check the oil level, coolant level, transmission level. Check water pump, spark plugs,when did you buy the van check see if the car got accidents car fax.com. Also do you speed a lot excessive speed can age your vehicle very fast especially you travel thousand miles and if use it to go to work. Go back to the dealer so you can get write off on the job than file a suit if proof of neglect some dealers are lazy too check the problem there are good and bad mechanics so check Better Business Bureau and National Cars Association for good dealers and reputable private mechanics you may can sue, but you can a lot of money big dealer mechanic for your own protection.
Posted on Jul 14, 2013
Testimonial: "We have been driving this van for several years but this is a recent problem, probably 6 or 8 months ago. But we haven't driven it in probably 6 of those months. Fluid levels are fine. What would cause a misfire on one cylinder?"
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Posted on Jan 02, 2017
Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.
Posted on Aug 18, 2009
SOURCE: My 2003 Ford Taurus LX
all system checked already, try that, direct the injector positive wire to 12v constant @ battery post, direct the ignition coil ground to engine mount, and make sure that the fuel pressure is not less than 30psi, check all the supply voltage for accurate 12.1-13.8 volts reading. if all this ok, try to replace another ecm, but you need to program this
Posted on Sep 13, 2010
SOURCE: i have a 1994 ford
check your compression, you might have low compression in that cylinder-also check your fuel injector in that cylinder, it may be damaged (wiring/connection) or defective.
Posted on Jun 01, 2011
SOURCE: 1997 ford f150 cyliner 7 misfire
After replacing the coil, plug and wire. The injector is working properly so I would say that you have a burnt exhaust valve. Get a cylinder leak down test or compression test to confirm this at a reputable mechanic.
Posted on Mar 04, 2013
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