Shuttering/Bucking, Power Loss Between 3,500 to 5,000 RPM - 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
Prev Previous Post   Next Post Next
Old 11-05-2012, 10:12 PM   #1
Focus Jr. Enthusiast
Join Date: Sep 2012
Fan#: 103978
Location: Atlanta, United States
What I Drive: 2002 Black Focus SVT

Posts: 38
FF Reputation: 2 RevLimit Good Standing Member
Buy-Sell-Trade Rating: (0)
Thumbs down Shuttering/Bucking, Power Loss Between 3,500 to 5,000 RPM

I'm having power loss issues between 3,500 to 5,000 RPM. Usually once the RPMs reach 5,000 the car will eventually begin to pull. This only happens when the car is in gear and it's very irritating to have bucking and jerking when I mash the gas until 5,000 RPM when a get a moment of nice power.

I have noticed that in the cold mornings the car RPMs will sometimes jump to 2,000 RPM until the engine gets warm.

It also sounds like sometimes the engine beings to backfire.

So far I have tried the following.

Replaced the fuel filter.
Replaced the spark plugs, gapped correctly.
Replaced spark plug cables.
Replaced the manifold cup-links with the CFM ones.
Replaced fuel pressure regulator vacuum line.

Which is the most likely cause

Air leak behind the MAF sensor?
Failing head-gasket?
Fuel not enough fuel pressure? Although the engine runs strong above 5,000 RPM.

Thanks in advance.

RevLimit is offline  
    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

All times are GMT -5. The time now is 07:17 AM.

Copyright 2002-2014 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.