My Wife Has A 2001 Focus With The 2.0 Ztec. She wanted me too do a tune up on it so she thought it would helpful to degrease the engine at our local carwash! Needless to say it runs rough at an idel or while you are driving! I did the tune up but diden't help! I took it to a local part store to run a checkup & that came back as a missfire on #4 Cilinder! What do I do now?.
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With out actually hearing it or knowing what engine is in it it hard to be 100% sure but, it depends on if its the 2.0 spi or the 2.0 ztec dual overhead cam, if its the spi, that particular engine is known for dropping the valve seats out of the head, the seats are the sealing steel sealing ring that the valve closes against during different strokes of the engine. its an aluminum head and a steel seat, they will expand and contract at different rates, if the seat doesnt have enough interference when pressed in it can fall out and damage the head, valve and piston, when the seat comes loose you will have a misfire and a noise coming from the engine, now.... that being said it could be a timing belt that has partially slipped... this is a real tough call without seeing and or hearing the car, what codes does it have?, whats the fuel pressure etc.... This is one you should have a qualified tech look at... sorry.
As long as everything you've mentioned is in good working condition I would test your O2 sensors and your mass air flow sensor both could cause a rough erratic idle and even a miss if the O2 sensors send a bad signal to ecu which would affect fuel trim ratio
there is a recall for the fuel pump, but only applies to certain focuses according to the build date. if your car doesn't fall within the build date, it is a customer pay item... the car may very well need a fuel pump, i would say that is probably the best possibility. the other thing about recalls is they do expire, or if the car has already had the recall done you are not able to have the recall performed again. if it has the ztec engine i have seen valve cover gaskets blow out and soak the spark plugs with oil, this also causes the problem your having.hope this helps you and good luck---also what parts does the dealer think it is?
Easiest way to find the PCV on a 2000 ZX3 (ZTEC engine)is to stand directly in front of the engine and look at the right side of the oil filler cap. From there, approx 10 inches directly below the the right side of the cap, you will see a black rubber hose/tube (3/4 inches)inserted into a rubber grommet--the PCV valve!! If you were to follow the hose/tube back through the emission components, you would find it connects to the lower rear of the throttle body.
have you given the car a tune up yet? is the check engine light on? if so, have you had that checked? that car also had a couple of recalls, have you taken it in to have the recalls repaired? I "HAD" a 2000 ford focus se 2.0L. the volume control in the factory radio has the speed control as in the faster you went the higher the volume went, so the miss in the engine might be being sent through the system and it thinks that you want to over come the roadnoise. as far as I can remember it is adjustable.
With having that many miles and the light being on with a code of O2 sensor, I'd say start there. Make sure which O2 sensor it is first, pre or post convertor. It's getting close to another tune up, but check your plugs first.
IS YOUR LOUD VIBRATION A LOUD RATTLE IF SO IT COULD BE YOUR CAT BREAKING UP THIS WILL CAUSE BAD RUNNING ..GIVE YOUR ENGINE A GOOD REV 3 or 4 TIMES OUT OF GEAR AND LISTEN FOR A RATTLE,,,,, HOPE THIS HELPS IF NOT CHECK THAT THE EXHAUST IS NOT BLOCKED ?? BEST OF LUCK-ELL BOY.