Bucking - Jerking Under Acceleration - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Focus Fanatics > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Thread Tools Display Modes
Old 01-01-2008, 08:49 PM   #1
Focus Rookie
Join Date: Sep 2007
Fan#: 50392
Location: Charleston, SC, SC
What I Drive: 2000 blue SE

Posts: 19
FF Reputation: 1 NKENN Good Standing Member
Buy-Sell-Trade Rating: (0)
Bucking - Jerking Under Acceleration

2000 Focus SE, MT, Zetec engine, 108K miles. No DTCs or pending DTCs. The car bucks and jerks under acceleration at any speed. It feels similar to the way an inexperienced driver starts off when learning to drive a manual tx. Idles good and runs good on a level road. The fuel pump was changed years ago under warranty before Ford recognized the problem with the fuel pumps and issued the extended warranty on the pumps.
So far the following things have been done with no change in symptoms:
  • Installed new Motorcraft plugs
    Replaced plug wires
    Replaced fuel filter
    Inspected ignition coil (looks good-no visible cracks, etc.)
    Inspected vacuum hoses
    Monitored the fuel presure with Auto Tap scan tool under actual driving conditions - Fuel pressure fluctuated between 37 and 44 PSIG

Any suggestions on where to go from here???????????????????????

NKENN is offline  
    Reply With Quote
Sponsored Links
Old 01-01-2008, 09:04 PM   #2
Focus Enthusiast
ProSilverVT02's Avatar
Join Date: Mar 2006
Fan#: 33656
Location: Upstate, NY
What I Drive: 2002 SVT

Posts: 345
FF Reputation: 7 ProSilverVT02 Good Standing Member
Buy-Sell-Trade Rating: (8)
I had the same problem. It could be a number of things. In my case, like yours, I had no check engine light. Checked under the hood and my throttle position sensor was cracked. Got a new one and ran good for about 2 days and then the problem returned. This time I had a crappy idle. Checked my Mass Air Flow sensor and decided to clean it. With the new TPS and clean MAF my problem was resolved.

Since you are specifically having acceleration problems it sounds like the fuel pump. I've seen around the forum that 2000's are known for having fuel pump problems. Even though you've already had it replaced, it may be the cause of your problem.
ProSilverVT02 is offline  
    Reply With Quote
Old 01-02-2008, 11:21 AM   #3
Focus Addict
cafociguy's Avatar
Join Date: Apr 2005
Fan#: 21858
Location: NorCal
What I Drive: 01 ZX3, 03 ZX3 PWSCed

Posts: 755
FF Reputation: 46 cafociguy Great Standing Member
Buy-Sell-Trade Rating: (4)
fuel pump or fuel filter is what it sounds like to me, but could be a MAF connection or just might need a cleaning.
cafociguy is offline  
    Reply With Quote
Old 01-03-2008, 10:19 AM   #4
Focus Rookie
Join Date: Apr 2007
Fan#: 46242
Location: Atlanta GA
What I Drive: 2003 ford focus se

Posts: 9
FF Reputation: 1 Jblackrose Good Standing Member
Buy-Sell-Trade Rating: (0)
sounds a bit like my car too
2003 SE model.

All I have done is replace the Fuel Filter

mine is still hurky jerky at times. but this does not happen all the time.
very weird. No check engine light is on.

keep me posted,

Joe Black Rose
Jblackrose is offline  
    Reply With Quote
Old 01-03-2008, 11:09 AM   #5
Token Engin-nerd
illinipo's Avatar
Join Date: Aug 2006
Fan#: 37693
Location: Well wouldn't you like to know?, Not Listed
What I Drive: dirty wag; Party; Bavarian phallus

Posts: 3,408
FF Reputation: 272 illinipo Outstanding Standing Member illinipo Outstanding Standing Member illinipo Outstanding Standing Member
Buy-Sell-Trade Rating: (19)
I would guess your clutch is slipping, or you have no friction surface left on the clutch or flywheel.
Originally Posted by Dennis_Grant
Remember this list: Bilstein; Penske; Koni; Ohlins; Sachs; Dynamic Suspension.

Not on this list? Almost certainly crap.
SUV this!
illinipo is offline  
    Reply With Quote
Old 01-14-2008, 02:32 AM   #6
Focus Enthusiast
svteric's Avatar
Join Date: Jan 2007
Fan#: 42526
Location: AUSTIN
Posts: 300
FF Reputation: 9 svteric Good Standing Member
Buy-Sell-Trade Rating: (0)
I am having the same problems too!
Dynoed 279hp and 224tq in 111 degree weather
(MODS):Magnaflow catback, vortech w/aftercooler, diablosport tuner, 67mm tb, 70mm MAF, k&n filter,55lb injectors, all three performance mounts, short throw shifter, 5.7" crank pulley
svteric is offline  
    Reply With Quote
Old 01-14-2008, 04:37 PM   #7
Focus Addict
ChrisRobin's Avatar
Join Date: Apr 2007
Fan#: 46204
Location: Vancouver BC, Canada
What I Drive: 04 silver SVT Focus

Posts: 979
FF Reputation: 4 ChrisRobin Good Standing Member
Buy-Sell-Trade Rating: (3)
The only time I noticed it on mine (if I'm talking about the same thing here), is if I'm in 2nd or 3rd, I don't remember which one, and my rpm's are too low. As in I should be in a lower gear. Upon acceleration it bucks a little until back up to higher rpm's. But that's probably just me not paying attention to my shifting.
ChrisRobin is online now  
    Reply With Quote

Bookmarks & Social Networks
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
bucking at 2.200 rpm | ford racing plug wires TEAM ST General Technical Chat 8 08-28-2007 11:38 AM
Need some input for more acceleration!!! teamrc49 Ford Focus & General Car Chat 2 05-07-2007 02:18 PM
Problem with acceleration darkproximity SVT Performance (2002-2004) 24 10-07-2006 01:32 AM
Loss of acceleration uphill, hesistation, engine light.. -diVe- General Technical Chat 7 05-30-2006 08:51 PM
I have lost my acceleration......help stxen12 ZETEC Performance (2000-2004) 16 06-12-2004 11:21 AM

All times are GMT -5. The time now is 02:39 PM.

Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.