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  1. #1
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    Default Broken Motor Mount = Bad Fuel Economy?

    Hey all, I just bought a 2002 Focus SE Wagon 5-Speed, only has 60K on it. Well when I test drove it, it rode pretty good, and then when I drove it home from buying it (both times it had been warmed up and was running smooth), but now I notice when I start it and its a cold start, it shakes like hell. Rear view mirror is vibrating, and when I put it in reverse, I can hear my license plate shaking real bad. Once it warms up it runs great. From what i've read, it could be the motor mounts, my question is, I'm getting horrible mileage, I have half a tank, and only have 60 Miles on my trip odometer, this doesn't sound right, could a broken mount be the cause of my bad mileage? I just got the oil changed, power steering flushed, fuel filter replaced, not much change. I'm probably gonna take it to my mechanic Friday and have him check out the mounts, as thats the only thing I can think of, and if so, get them replaced (BTW how much are OEM Ford mounts for it? I found some at NAPA for $60, but i've heard the aftermarket ones suck).

  2. #2
    Don't Call Me Gaga!
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    The mounts wouldn't cause the fuel consumption issue.... but as with any new project car, tackle one problem at a time, starting with the obvious ones.
    I have too many cars.

  3. #3
    [FJ] Specialist G-forces's Avatar
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Clean your injectors, that could be a contributor. you can run Marvel Mystery oil for a few tanks, along with B-12 (cheaper than Seafoam and just as good) for a couple of tanks. I like to add some octane booster (MMT type) when I use Marvel Mystery oil since M M oil has a lower octane number than 87 gas. Not sure about B-12, some of the things in there are higher and some are lower octane number.

    While you're waiting for those tank-fulls to be used, check for any air leaks... PCV hose by the IM is a big one that fails... and check tightness on all collars on the intake. One more good thing to do with a newly acquired used car, check/clean/improve all the grounds.

    Welcome to FJ.
    Getaway in Stockholm 2: Escort Cosworth vs Supra... adults-only driving on YouTube.

    Silver SVTF w/EAP, #800 of 1,976 3drs, one of 87 built in 2004

  4. #4
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Z, check further down in the main page of the forums. Tousley Ford is a sponsor, you can pick up an OE one for about as cheap as you're going to get it.

    It is most certainly the motor mount causing the vibrations. My sister had the same problem with her wagon.

    For the mileage, we have an '03 ZETEC wagon in the family and I'm not sure it's ever done better than 28MPG, usually it gets around 25MPG.

    My two pence, for what it's worth.

    1.) Get a bottle of Techron, Redline Fuel System Cleaner, or Gumout (with REGANE), run that through your next full tank. Then replace your fuel filter.

    2.) Check the air filter, replace if need be

    3.) Buy some MAF Sensor Cleaner at your auto parts store and clean your MAF. Follow the directions!

    4.) Do an oil change with a good high quality oil like Amzoil or Royal Purple and a Motorcraft, Purolator, or Wix filter. I would only run it for 3000 miles, or maybe a little less. This will let the oil clean out your engine, in case it didn't have the best oil change record. It might not do anything, and is probably gross overkill, but I'm anal like that.

    5.) Make sure you have at least 32PSI in your tires.

    That covers a few basics. From there you'll have to see what happens.

    Enjoy the car!
    Quote Originally Posted by OmniFocus View Post
    If I have to punch everybody in the balls until they wake up from this delusional coma, I'll do it.
    2001 Silver Focus ZX3

  5. #5
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Quote Originally Posted by G-forces View Post
    Clean your injectors, that could be a contributor. you can run Marvel Mystery oil for a few tanks, along with B-12 (cheaper than Seafoam and just as good) for a couple of tanks. I like to add some octane booster (MMT type) when I use Marvel Mystery oil since M M oil has a lower octane number than 87 gas. Not sure about B-12, some of the things in there are higher and some are lower octane number.

    While you're waiting for those tank-fulls to be used, check for any air leaks... PCV hose by the IM is a big one that fails... and check tightness on all collars on the intake. One more good thing to do with a newly acquired used car, check/clean/improve all the grounds.

    Welcome to FJ.
    I've never tried MMO in my gas. Actually, I've never tried it. It really works?

    I did try B-12 once, my car felt like it was filled with rocket fuel, no ignition problems, quite the opposite, it felt like a little bit of a boost.
    Quote Originally Posted by OmniFocus View Post
    If I have to punch everybody in the balls until they wake up from this delusional coma, I'll do it.
    2001 Silver Focus ZX3

  6. #6
    [FJ] Specialist G-forces's Avatar
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Quote Originally Posted by RainyZX3 View Post
    I've never tried MMO in my gas. Actually, I've never tried it. It really works?

    I did try B-12 once, my car felt like it was filled with rocket fuel, no ignition problems, quite the opposite, it felt like a little bit of a boost.
    It works well in gas, if used rarely for special cleaning and injector lubing like this. Of course, Marvel Mystery oil is especially good in oil to break-in new rings, or to clean out gunk in the passages.

    I've noticed the B-12 kick before too. I think B-12 raises octane number a bit, so your knock sensor stays a bit more quiet, and allows a bit more advance timing.
    Getaway in Stockholm 2: Escort Cosworth vs Supra... adults-only driving on YouTube.

    Silver SVTF w/EAP, #800 of 1,976 3drs, one of 87 built in 2004

  7. #7
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Ok thanks for all the suggestions. I just put a bottle of Lucas Fuel System Cleaner in it when I filled up, reset the trip and we'll go from there. I was probably gonna go to my local mechanic on Friday when i'm off Work and School and have them check out the PCV valve and maybe check and see if the motor mount(s) is/are bad. I got the air filter replaced and fuel filter replaced when I went to Jiffy Lube to get my oil changed. I'm not going for a hypermiler car here, I just want to get decent city mileage, because so far I haven't been impressed. Could dirty injectors cause the vibration/shaking when cold?

  8. #8
    [FJ] Specialist G-forces's Avatar
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Yes, dirty injectors can cause uneven fuel burning, power loss, misfires, and shaky idle. Sometimes if they are gummed up by cheap gas and/or long periods of sitting without being run (like only 60K miles on a 8-9 year old car), they will need more aggressive treatment than just one bottle of cleaner... that's why I recommended the cocktail above, the Marv Myst oil is also an excellent combustable lubricant.

    Also, it's not so much the PCV valve as it is the PCV hose where it goes into the IM. The original hoses get soft, split, and leak air like crazy after awhile, now the replacements are armored. An air leak like that (or almost any air leak) can also cause rough and variable idle.

    Of course, it could be that the mounts are bad too, so you are feeling the problem more.
    Getaway in Stockholm 2: Escort Cosworth vs Supra... adults-only driving on YouTube.

    Silver SVTF w/EAP, #800 of 1,976 3drs, one of 87 built in 2004

  9. #9
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Yeah,
    I'd try G-Forces setup. Lucas doesn't do much even on a good car.

    For the sake of god, make a friend with a driveway and never bring your car back to Jiffy Lube! Even if you have to bring him/her a 6 pack every time you do your oil, you'll still save money. But at least you got decent oil.
    Quote Originally Posted by OmniFocus View Post
    If I have to punch everybody in the balls until they wake up from this delusional coma, I'll do it.
    2001 Silver Focus ZX3

  10. #10
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Thanks for the suggestions, although I checked my tires today and they (with the exception of one) were all pretty low pressure, like 15 PSI, so I couldn't find a place with free air before I went to work so first thing I do when I get a chance tomorrow is going to a 7-11 and filling those up. My fiances Malibu was getting crappy mileage and turns out her tires were low and she aired them up to spec and it got fantastic mileage. If that's the cause i'm gonna feel dumb and relieved at the same time. Although i'm still going to the shop tomorrow to get my motor mount checked out. It was about 19 degrees tonight and I started it, and the whole thing was vibrating like no other, so if a mount is bad i'll order a good one off the internet and get it replaced next week.

  11. #11
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Dead motor mount in winter = violent driving to work. Happened to my families 03 focus wagon.

    Get a 12v airpump or a good bike pump so you can inflate your tires without having to drive. The best time to inflate your tires is before they have been driven on for the day as the pressure. I have a 12v pump but usually use a bike pump because it honestly takes less time for me.
    Quote Originally Posted by OmniFocus View Post
    If I have to punch everybody in the balls until they wake up from this delusional coma, I'll do it.
    2001 Silver Focus ZX3

  12. #12
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Yea I filled them all up today, took me forever to find a gas station with Air that actually worked, I do have a 12V pump but its super loud and the people at my apartment complex are pissy. Anyway i'll see if my MPG improves, hopefully it will. I'm taking the car in Monday to get it looked at and see if the motor mount is shot. Another thing, it may have been going on the whole time and I just had the radio on, but when i'm going from a dead stop, and i'm letting the clutch out into First, at the very end of the clutch release, for a split second it sounds like a VW Diesel sound. I know thats a weird comparison, but for a second it does sound like that. Sitting still its fine, but its just that last bit from open clutch to closed that it makes the noise. Any idea?

  13. #13
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    Are you meaning the raspy engine sound, the gearie transmissio sound, or the clickety clickety of the valve train?
    Quote Originally Posted by OmniFocus View Post
    If I have to punch everybody in the balls until they wake up from this delusional coma, I'll do it.
    2001 Silver Focus ZX3

  14. #14
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    I just went out and tried it again to listen to it more closely, tried to record the audio on my phone, didn't work so well, but it seems to be just at very low revs (I don't have a tach so i don't know exactly what's going on) and it does kinda sound like a clacking and a little raspy maybe. Could it also be just the motor mounts are bad and its causing a vibration at low revs and that's what i'm hearing?

  15. #15
    [FJ] Specialist G-forces's Avatar
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    Default Re: Broken Motor Mount = Bad Fuel Economy?

    The raspy sound (like a buzz?) could be your header heat shield (or flex pipe mesh) vibrating when you cross over ~2500-2800 rpm. That rpm range is where a Zetec is loudest and the engine harmonics "constructively interfere" to yield it's greatest vibrations. Just see if you can move the heat shield by hand, the aluminum under one or more bolts may be corroded away (dissimilar metals and it's location makes that a spot that will always be a corrosion problem).
    Getaway in Stockholm 2: Escort Cosworth vs Supra... adults-only driving on YouTube.

    Silver SVTF w/EAP, #800 of 1,976 3drs, one of 87 built in 2004


 
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