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Old 02-22-2010, 04:32 PM   #1
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2000 SE W/ Split Port 2.0L runs rough

hello all,
I have a 2000 Ford Focus SE with 150,000mi on it.it has the 2.0L Split Port engine in it. it runs rough at idle and low speeds. somewhat smoothes out once at highway speed. prior owner already changed plugs, plug wires, all filters, fuel system and intake cleaning. it kinda seems to me that the timing may have jumped a tooth. i have not been able to read the codes yet. plan to tonight. any ideas please let me


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Old 02-22-2010, 05:49 PM   #2
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Could be a timing thing...or it could be the dreaded spi problem of the valve seat dropping. Unfortunatly you do have a lot of miles on it, so I would not be surprised if it is the problem. But rough doesn't necessarly mean that. Maybe get it checked out like get the compression checked or make sure everything is running as it should.
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Old 02-22-2010, 06:43 PM   #3
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movede to spi section maybe better help here.
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Old 02-23-2010, 10:05 AM   #4
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Quote:
Originally Posted by viney266 View Post
movede to spi section maybe better help here.
Except you put it in the owner's lounge, which is even more obscure than the SPI Performance Chat

Anyhow, to the OP, does it get any better when the car warms up ?

Mine acted like that until I replaced the upstream o2 sensor because the heater circuit was bad. After that it was replaced with an inferior aftermarket sensor which made the cold running issue go away (good heater circuit) but it didn't run like it used to when warm. Now with an oem identical sensor it's good.

Anyhow, if the o2 sensor is original it may need to be replaced. The MAF sensor also controls fuel trim and if you have the ability/specs to test it, it would be a good idea too.
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Old 02-25-2010, 08:06 AM   #5
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Update: pulled Codes P0302 Cylinder 2misfire
- pulled all plugs performed compression test
- good compression in cylinders 1, 3, 4
- NO compression at all in cylinder #2
- added a little oil to cylinder no improvement
- added compressed air to cylinder through plug hole turned engine to close both valves
- noted no air leaking through valves
- Used bore scope to perform internal cylinder inspection
- Noted hole in piston and damaged cylinder wall

- most likely cause due to running engine with to hot of a spark plug or wrong plug.
- needs new engine...:(
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Old 02-25-2010, 05:54 PM   #6
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I have an '03 2.oL SPI with 135,000 and it does idle rough. Just started doing that...runs normal during standard driving. 80k on the platinum plugs I put in a while back......getting ready to change those.......
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Old 03-02-2010, 12:03 PM   #7
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Originally Posted by Mr. Ford Focus SE View Post
- most likely cause due to running engine with to hot of a spark plug or wrong plug.
- needs new engine...:(
I'll bet it dropped a valve seat and then the valve hit the piston and put a hole in it.
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Old 03-02-2010, 01:55 PM   #8
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Quote:
Originally Posted by 2003focusowner View Post
I have an '03 2.oL SPI with 135,000 and it does idle rough. Just started doing that...runs normal during standard driving. 80k on the platinum plugs I put in a while back......getting ready to change those.......
And will be connecting a scan tool on it tomorrow night. These symptoms are also evident of a bad egr or MAF sensor.
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Old 03-02-2010, 06:54 PM   #9
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not real sure of what caused the failure yet.. I am switching the engine out though I am not putting in another SOHC. I am switching it over to a DOHC Zetec 2.0L that i just purchased with 50,000 miles on it. after i complete the swap over i plan to tear down the SOHC to just inspect the engine for the cause of failure. I have noticed that the valve seat dropping issue seems to be a major flaw in that engine. so you are most likely right.
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Old 03-02-2010, 08:38 PM   #10
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Assuming its an auto you'll need more than just the motor. you'll need wiring harness, ecu, pass motor mount, exhaust manifold, and i'm prob leavin a few things out but make sure you have everything before you rip into it and good luck
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