Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - Reply to Topic
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Technical Chat > Shuttering/Bucking, Power Loss Between 3,500 to 5,000 RPM

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    

Thread: Shuttering/Bucking, Power Loss Between 3,500 to 5,000 RPM Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What I Drive
Year, color, and model of your car. Example: 2003 Focus Centennial Edition Sedan
Your real name.
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-15-2014 07:35 PM
sailor Tx for posting your cure!

(and nice to see you posting here again)

Had a question just today from a member with the same symptoms, this may help them.
05-15-2014 06:38 PM
RevLimit The problems I was experiencing above were caused by a faulty ignition coil pack. I purchased a replacement Ford OEM pack and the car runs great now.

Sorry for not updating everyone sooner.
11-08-2012 04:44 PM
I'm in Lilburn/Lawrenceville area

I'd be glad to help with my Xcal.
11-06-2012 10:47 AM
RevLimit I will buy some of the MAF cleaner and give that a try. Do any of you know someone in the Atlanta area that has a dataloger?

Thanks for the feedback everyone!
11-06-2012 09:17 AM
Jaketet They have MAF cleaner that you spray onto the wire. Also, datalogging like Tom said will give you a better idea of where to start.
11-06-2012 08:43 AM
Scout706 Very carefully. Seriously, it's usually a thin platinum wire. If you're unsure, maybe a mechanic is the best way to go.
11-06-2012 08:42 AM
1turbofocus The best advice I can give is find a local member with a xcal and do a datalog , I will be glad to look it over and help with the problem

Changing parts till you find the issue gets very costly as I am sure your finding out

11-06-2012 08:03 AM
Originally Posted by Jaketet View Post
tried cleaning the MAF?
I did not think that the MAF could be cleaned? How can I clean the MAF sensor without damaging it?
11-05-2012 10:30 PM
Jaketet tried cleaning the MAF?
11-05-2012 10:12 PM
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.

Posting Rules
You may post new threads
You may 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

All times are GMT -5. The time now is 10:11 PM.

Copyright 2002-2015 All Rights Reserved : 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 Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum and Volvo XC90 Forum.


Search Engine Optimization by vBSEO 3.6.1