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Old 02-10-2013, 07:39 AM   #1
DonatasSVT
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P0133 and P1381. Rough idle on cold starts - SVT

So i have this interesting issue with my focus. I has very rough idle while the engine is cold. Especially in damp weather. When engine warms up (after 5 mins or so) it drives normally.

I scanned with my Predator and it shows P0133 and P1381 codes. However, engine light is off - it was on once about a week ago, but then went off.

I have never changed timing belt. My focus now has 65,000 miles. Tom's tune is installed.

The interesting part is that I had Southbend clutch and aluminum flywheel (if I recall correctly it was Fidanza) installed some years ago. Recently, some problems started:

1) Crankshaft position sensor broke (had code P0320). It was mechanically damaged from inside (no clue how it could happen). I had it replaced and the shop that did it told that somehow flywheel touched the sensor, so to install a new one, they put a small spacer that it would have some clearance from flywheel. It worked pretty ok after the install, even though I noticed that revs drop to a lower point than usual when changing the gear. The engine even stalled a few times but it was quite rare, so I didn't complain.

2) Clutch throw out bearing broke. I had it replaced. The shop told me that the clutch and flywheel look ok, therefore no need to change them. The engine and clutch worked normally after the change.

3) A few weeks after the fixing throw out bearing rough idle started, as I described above.

I have a feeling that somehow all these problems are related. I saw this thread, which sounds quite similar to mine situation but mine worked perfectly fine for several years after the install of Sbend clutch and fly.

Any thoughts?



Last edited by DonatasSVT; 02-10-2013 at 12:37 PM.
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Old 02-10-2013, 10:52 AM   #2
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That is some very next level mechanical posts. I remember reading that and just thinking. Good job to the original poster.

That would see likely then. Did you get a glance of the flywheel before it was put in years ago. Of course ... that is weird that you installed it several years back, and it's not giving you problems.

You said you just got the tune ... I am going out on a limb here, but do you think the tune could have thrown it off a bit as well?

But I still recommend you change your timing belt sometime in the near future.

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Old 02-10-2013, 11:05 AM   #3
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Shoot me a datalog and let me see if I can help

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Old 02-10-2013, 11:47 AM   #4
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Thrust bearing could be bad allowing the crank to shift when you use the clutch
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Old 02-10-2013, 12:36 PM   #5
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Thanks for the first replies.

I don't recall any details of the flywheel prior to its installation. The tune was installed quite some time ago (a few years at least), so it is not the cause for sure.

Tom, is it ok if I datalog with Predator? I'm pretty sure that I wouldn't be able to find xcal anywhere around my place.. Which data type should I datalog?

Last edited by DonatasSVT; 02-10-2013 at 04:28 PM.
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