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Old 09-20-2006, 10:26 AM   #71
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well, i spoke too soon. seems this only fixed my throttle response. he'll gitty up and go now with no hesitation, but still stutters at times, although not as bad as before. my mpg still SUCKS too. 27mpg...i've got a V6 that get's that good of mileage!
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Old 12-28-2006, 12:16 PM   #72
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The updates hose PN

Well I just replaced the PCV hose on my '01 Zetec as is it had collapsed. The original PN was XS4G-6N664-AA 072 GA and the updated PN is XS4Z-6N664-BA and come with nice heat protection foil all for $16. My dealer doesn't even have the PCV valve in stock, so they must not go too often.
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Old 01-28-2007, 05:04 PM   #73
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well, i spoke too soon. seems this only fixed my throttle response. he'll gitty up and go now with no hesitation, but still stutters at times, although not as bad as before. my mpg still SUCKS too. 27mpg...i've got a V6 that get's that good of mileage!

same thing here. checked pcv valve-it rattles. gotta get this problem fixed.
Im selling my fucus to get a 4x4.
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Old 01-28-2007, 05:55 PM   #74
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Apparently, this hose does fatigue and collapse over time. I discovered that mine had done while chasing down what turned out to be a bad coil pack.

I sectioned my failing hose with a section of much stiffer gasoline line and a couple of hose clamps. Works like a charm.
Jeff Triplett
196+K on the motor and still going!
Coldwater, MS
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Old 05-25-2007, 08:20 PM   #75
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Thumbs up The unknow vacuum hose ...

" bwojdyla Great work " from page 1 ....... and I totally agree.

My 'little mouse' is living hard times now. I need to replace a motor mount, after a wide research we came to the conclusion is the driver's side mount, every body I asked said ' replace all 3 ' but that is a lot of money here. So after a year with the 'problem' and just enought maintenance in between the days now is the time for a 'Major tune-up' as we said this part of the world: Oil change, replacing filters ( air,oil,fuel ) new plugs, cleaning FI system, engine bay cleaning, etc,etc. My mechanics said this was a 4 hours labor, because the car is the family taxi we schedule while the kids where at school so about 3 pm my car must be back ... 9pm at the phone my mechanic just said 'I quit, this damm hose was causing the sudden death at iddle but I can not replace it, you need the original ford part' after some comfort words he found the strenght and set a temporal fixture while we get the replacement.
The bad new was the part is not in town (population close to 1 million metro included ), ford dealer didn't know the part or the name and just by the part numbers said we can order it by $ 25 USD in 3 days ... Damm it ! now is friday, that means we have to wait one week at least. So I came to my friends and found this thread. Great ! This are my conclusions:

1. The important number for the part Id is 6N664, this is the common in the thread. My USA-made focus part number reads C013A 988F-6N664-BA is a motorcraft and we live in Mexico.
2. With 65K miles total rode the hose broke down as a consequence of the failing motor mount during the last 8k miles, because of motor jumping whit normal load ( Auto-gear/Zetec ) This low frequency resonation notices as noise inside the car only and some shaking at the engine bay.
3. The initial symptom is 'sudden dead' at iddle (while parking or trafic light )the rpm readings for iddle were 600 +/-10% far from the 800 rpm ideal. This sudden dead it's not depending on a cold start, this just happen at iddle.
4. The DTC-reading at the dash was 9202,when checked with a OBD scanner this code comes and go. We can only expect is variations in fuel mileage, sometimes is good sometimes is poor. The Fuel pump computer is working to keep the process under control.
5. When the problem is evident and a temporary solution is made, the CEL may or not may came on, but the OBD code registered has the same meaning: P1237 (vacum leak) P0171 (mix too lean) both codes had a variant to light the CEL.
6. Many people is solving the problem by not using the Original part, just crafting a replacement with fuel or butane flexible hoses.
7. A solution to make the replacement stronger may conduct to a bigger problem. It seem evident to make a more rigid solution, but the flex of the pipes helps to keep the hose firmly attached because is vaccum suction that builds the whole line.
8. After replacing the hose your car needs to re-learn to save fuel, so computer reset make sense after battery disconnect.
9. A low hissing can be heard but you need some room to make it evident.
10. All electric devices -dash, headlights, courtesy light, radio display- show a little flickering while at iddle and stumbling happens. This is evidence the motor is powering to keep the amps up and is suffering while changing the fuel mixture.

What a great machine is the Zetec properly maintained. I firmly believe in original specification. Ford dealers are making hard times for us because they are starving for money. Same motorcraft parts buyed outside ford desk are +35% cheaper. Hope we can help more Focus owners, It's a very good car to drive.

Thank you all ... and don't forget F1 GP Monaco this weekend.
Add yourself to the FF Map !!! ... Thank You Chris.


Last edited by vrat_on_2k; 05-25-2007 at 08:23 PM. Reason: grammar and typo ... sorry for my english.
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Old 07-15-2007, 01:11 PM   #76
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Thanks you guys for the info, I checked my hose and there it was, all collapsed.

Ran to AutoZone (it's sunday, so the parts dept. is not open today) and got something to work. Gonna reset the ECU now, but thanks for the great insight!

The Ultimate Underdog !!
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Old 08-16-2007, 06:54 PM   #77
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AHHHH I wish I had found this thread a week ago!!

I came back from a 500 mile trip and parked the car for a few hours. Got back in to go to the store and the car would not idle for chit and CEL came on.

Next day took her to Autozone and to get the codes... P0113, P0171, P1131. After searching the net for help I decided to check out all the hoses. Sure nuff the PCV hose was collapsed at one end. Took the hose off and cut it back an inch or so. And whaddayaknow. Runs and idles great!!! Gonna hit the dealer and get a new hose.

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Old 08-17-2007, 05:08 PM   #78
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i may need a new hose soon. myine is kinda sqishy where it meets the intake manifold but not anywhere else.
focus owner whos runnin with the hatchet
zc187 focus nation and fvscc's car 343
still getting part and things for this turbo.
will it run soon?? who knows.
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Old 10-31-2007, 08:37 PM   #79
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Originally Posted by bwojdyla View Post
So, I've been having the delightful experience of stumbling at idle, as many many Focus owners are blighted with. It finally got to the point where I was annoyed enough to fix it. So i got into my grungies and started rooting around (deep) under the hood. First I took the upper intake off and cleaned the MAF sensor. The back hot wire was very dirty. That made the problem a little better but it didn't go away. So I pulled into the drive and let the car idle. I opened the hood and started blindley poking around the back of the intake manifold, to see if any hoses were loose. As I'm running my fingers over the PCV hose (just as it makes the 90 degree turn into the manifold), my index finger gets sucked into (into) the hose! I pulled it out cause it scared the crap outta me. But when I covered the hole back up the engine started sputtering. AH HA!! The vacuum leak was causing the hose to fold over itself and the engine wasn't getting enough air from either atmosphere or PCV. So, since it's getting late and I don't feel like going down to Ford to pick up a new part at that moment, what do I do? that's right, Duct tape. worked beautifully. My baby purrs like a kitten once again. I'll post pics of both the failure and the fix when I get the new part.

As an aside, any other Auto/Duct tape stories?
I did what you say.
I replaced the PCV hose that connects to the Intake manifold + a new pcv valve. I bought these at dealer with the part number you gave.
My Focus Ztec is still tumble shaking so bad at stop on DRIVE. However when I put to NEUTRAL, the shaking goes away (reduced). I noticed when on DRIVE, and it is vibrating, I put a little of gaz on the throttle while applying the brakes, the viration shaking thing goes away. Another thing is when I come to a stop after driving at regular speed (60kmh), the car stumble only after 5 seconds on DRIVE at stop light.

What could it be now? The ICV? I do not want to replace the ICV and find that it not solves the shaking. The ICV is almost 80$.

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Old 01-15-2008, 12:11 AM   #80
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This needs to be a sticky. Had the same problem.. hose replaced and the car runs like a champ.
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