Question about 2004 Ford Freestar

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Bucking and Jerking upon acceleration

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.

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  • Mark Miller Jul 14, 2013

    Also, the injectors were checked and they are fine.


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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 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

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SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

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

  • 289 Answers

SOURCE: Misfire on cylinder 4 only when accelerating

coil pack

Posted on May 05, 2010

  • 387 Answers

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

  • 1915 Answers

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

  • 1 Answer

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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When accelerating from 60-70, it is jerking o r bucking

all cars do that, called misfire , all do it never tuned up.!
what mileage on that engine, from last tuneup.? and total miles
100k,? what?
if that is engine buck and not transmissions slip or unexpected shifts.
then that is called MISFIRE<
and #1 cause, is bad spark plugs.(warn out as ALL DO)
there are 49 more causes, but most times not on newer cars.

ever get that car serviced, ?
all cars buck ignored, all. for 100 year in a row. (gas)
if the spark is good.
we use a scan tool and watch for DTCs during the buck.
the Scan tool will tell you , if the ASD relay drops causing said buck and why.
there is no other ways... to fix, not bad spark plug bucking
takes tools.

I have 2010, same engine, in my priv garage. (Grand Cher)
and its got fresh spark plugs in it.
the are not easy to change out. ask.
has COPs in the way. and more...

use the best spark plugs you can find, to make them last longer and not have to pull those cops too often.
also the cops have boots that can carbon foul.
but the service shop knows all this stuff. let them>?

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After your discription of P0300 and P1305, would this cause the car to surge and jerk after it warms up?

This points towards the number 2 cylinder ignition coil or ignitor circuit malfunctioning. If it is intermittent, your car will have and lose power, making the engine run like a bucking bronco. A diagnosis is in order, it could be a wiring issue or a bad spark plug causing the symptom. Could also be ignition coil or ignition module. Should be a quick repair. 25315923-dz1fkxf1fwolart5ai0divhk-5-0.jpg

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1 Answer

Jerking accelerating

similar problems: After 20min cool down jeep was bucking/lurching that I traced to bad o2 sensor in exhaust manifold (which you've replaced is seems). The second problem of bucking/lurching, backfiring under certain driving conditions I traced to the battery sliding into the computer wiring harness, disrupting sensor input / output signals. I cured this problem by placing a 1" spacer on rear battery clamp, pushing the battery forward. Been years and no return of problem.

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the convertor is the problem.will cause decreased engine power, another sign is bucking and jerking upon accelerating. the car will lose power when going up a hill. if engine runs hotter then usual and coolant is up to par, may be a bad converter.

Jan 11, 2011 | 1998 Oldsmobile Intrigue

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Bucking while idling

You want to check your charging system. Take a reading at the battery and see what you get. it should be 13.5-14 volts. Check the volts at the cables. with the battery hook up take a reading at the cables. if there is a big difference between the cables and the battery then you need to clean and tighten your cables. If the volts are less then I said before then you need to have your alternator checked.

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