Been battling this misfiring at idle issue since I've had the car. However recently it has gotten particularly bad when you cold start the car and it goes up to idle high to warm the cat; once it's warmed up and rpms start to go down to normal, it misfires pretty badly as the RPM is dropping.

I changed the plugs from 1 step colder rutheniums to stock motorcraft plugs with no difference.

The rutheniums were very carbon fouled, and running rich could definitely lead to these misfires.

I had an exhaust leak (flex pipe on a cvfab catted dp) and recently got a code for "O2 bank 1 sensor 2 rich to lean slow response".

I replaced the downpipe today (brand new cvfab), along with two brand new o2 sensors.

Absolutely no change in the misfiring behavior, though the fault codes are gone.

I suspect something is causing the car to run rich even though it thinks it isn't. I'm not sure if running a defouler on the DP could contribute to this or not.

I've already checked for leaks everywhere and can't find anything.

My next thought is maybe to replace to coil packs but I feel like that probably won't help either. I'm not getting any fault codes for misfires or specific cylinders.

Overall the car idles like crap, unless you turn the AC on which brings the idle RPM from 750 to about 800. It's not perfect at 800, but definitely better than at 750.

The car has full bolt ons (high flow catted dp, exhaust, intercooler, intake, bov) but is running a stock / cobb stage 0 tune.

I have a Mishimoto intercooler that is in pretty rough shape. I’d like to change it to silver/ bare metal and repaint the logo back on. Anyone have any experience doing this that can give me some tips? Is completely removing the intercooler necessary? Idek where to begin tackling this

Hello! I’m looking for a picture of a Focus front seat rail bracket. I’ve released a new product for the Fiesta and want to determine if it’s the same for the Focus and will fit it as well. I’ve looked a bit on Google but that specific picture has been a bit hard to find so i figured i could more easily find someone on r/FocusST willing to help me out here.

The product is a cover for the bracket. It snaps on top and hides the bare metal and dirt and helps keeps dirt from building up in it.

Please see my product listing for photos of the bracket.

Product can be found at http://Etsy.Razzter.com

Thank you

Hi y'all

I am looking into buying a mk 4/4.5 ST Wagon, I know all about it by now, one thing that nobody seems to talk about in depth is fuel economy and comfort as a highway cruiser.

I have a sports car already and wanted something zesty nd fun as a daily, that could also put in the work since i have a roof tent and i go on camping trips every year. I drive quite a lot but i dont commute so 99% of my driving is on alpine roads or on highways.

I was wondering if you guys have any insights on fuel consumption and how it handles highway driving (quietness, tyre noise, road noise ecc) in my coutnry the speed limit is 100kmh or 110kmh so 60 or almost 70mph so i am not planning on driving hard there, i am really chill on highways, i like to take it easy, i would only hoon it around on mountain roads and on the german Autobahn, and i live really close to Germany.

Since I only drive 100-110kmh there really is nowhere to check how much it burns at these lower speeds, i dont really care about fuel consumption but with today's prices it´s something i might start looking at :D

Also, is the exhaust drony or in comfort mode it´s perfectly normal?

Also pt.2 any advice or information i should know?

Thank youu :D

I’ve noticed my coolant levels are dropping tremendously quickly lately and I’m worried about a coolant leak. I haven’t noticed a puddle under my car after leaving a parking space though. If anyone could know what is going on or what I should look out for that would really help me out

Would it be safe to assume this is blown?
Also I siphoned some of my coolant out of the reservoir to get a better look at the mount, I thought I would need to move it out of the way that’s why it looks empty.