Question about 2004 Ford Freestar

1 Answer

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.

Posted by on

  • Mark Miller Jul 14, 2013

    Also, the injectors were checked and they are fine.

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 16 Answers

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?"

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
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.
goodluck!

Posted on Jan 02, 2017

  • 534 Answers

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

melvi_99
  • 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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

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>?

Nov 23, 2015 | 2012 Jeep Liberty Sport 4dr SUV 3.7L V6...

1 Answer

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

Dec 10, 2014 | 2000 Toyota Corolla

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.

Jul 04, 2014 | 1997 Jeep Wrangler

2 Answers

Engine chugging, like there is no gas but there is and a sulphar smell


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

2 Answers

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.

Apr 01, 2009 | 2000 Ford Windstar

Not finding what you are looking for?
2004 Ford Freestar Logo

304 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75807 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22133 Answers

fordexpert

Level 3 Expert

5495 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...