SVT with sudden rough idle, power loss - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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

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    
FocusFest FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 01-14-2013, 10:49 PM   #1
Focus Fanatic
swansong's Avatar
Join Date: Feb 2011
Fan#: 83576
Location: Appleton, WI
What I Drive: 2008 Saab 9-3 Aero SportCombi XWD

Posts: 1,523
Points 2,308, Level 29
Points: 2,308, Level: 29 Points: 2,308, Level: 29 Points: 2,308, Level: 29
Level Up 6% Completed
Level up: 6% Level up: 6% Level up: 6%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 12 swansong Great Standing Member
Buy-Sell-Trade Rating: (4)
SVT with sudden rough idle, power loss

My SVT very suddenly started to run like crap. Here's the situation. Filled up with gas today. Car has been running quite well, got 29 mpg on the tank on a 250 mile trip. On the way home, a few miles from the gas station the car starts to lose power and runs really rough in gear or neutral. Sounds like rocks rolling around when I apply throttle, gargley and deep sounding. I coast to a stop in neutral, with the car stumbling the whole time. Shut it off. Turn back on and it can barely idle, requires throttle to keep from stalling. Runs terrible, sounds dangerous even. Shut it off. Called AAA and had it towed to my local shop. It's sitting at the repair shop for them to diagnose tomorrow. No CEL through any of this.

Hopefully its something simple, I'm suspecting fuel filter or pump... Better not be timing related since that was done 55k miles ago.

More info:
Car has 135k miles.
Fuel filter mileage unknown, could be quite old as the filter, bracket, and nuts are very rusted. (Which is why I haven't gotten to it.) No mention of it being changed by PO, who kept decent notes and was a Ford mechanic.
For past few months car has had a slight stumble at cruising speeds and occasionally threw P0133 and P0172. Changed O2 sensor, reset ECU, car has run much better since with no codes, but still not 100.0%.
Has Toms Tune. No issues with the tune AFAIK.
New Motorcraft copper plugs and CFM wires.
New Alternator.

Basically, I'll see what the shop has to say tomorrow, but I'll back up their thoughts with what the FF community has to say.


It was bad gas. Really.

Shop replaced the fuel pump and filter. Still ran like garbage, very difficult to start it. Sat for a few weeks in the cold. Tom (1turbofocus) helped me get it started and debugged. I got the car running with the gas on intake trick. Once it was warm it ran ok, but felt down on power, like 50%. Figuring it might just be as simple as bad gas, I put some Heet and Seafoam in the tank and tried to drive it off. Put 100 miles on and it ran better as it went, almost completely back to normal. Still had a small hiccup between 1500 and 2500 rpms, usually in second gear. Filled it up with gas again and let it sit overnight in the cold. It fired right up the next morning. Ran better and better over the next few days, and no issues since. Boo Citgo!

Mine: 2008 Saab 9-3 Aero SportCombi XWD: 92k, Black, Manual, JZW Stage 1. 320hp/400tq.
Gone: 2002 SVT, #1654

Hers: 2010 Focus SES: 84k, Ebony, Auto, Moon and Tune

Last edited by swansong; 07-31-2013 at 09:16 AM.
swansong is online now  
    Reply With Quote

Bookmarks & Social Networks

Quick Reply

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:


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.

Thread Tools
Display Modes

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

Forum Jump

All times are GMT -5. The time now is 09:13 AM.

Copyright 2002-2014 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 Audi S3, Ford Fusion and Acura TLX. 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. Challenger Hellcat - Charger Hellcat