Symptoms of a valve seat about to drop? - Focus Fanatics
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Old 02-04-2013, 09:24 AM   #1
GUM85
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Unhappy Symptoms of a valve seat about to drop?

I was wondering if there's any tale-tale signs that a valve seat is about to drop? The reason I ask is because my 02 LX has started to idle really rough. It started out as a very mild hiccup in the idle but has increasingly got worse to the point that it idles extremely rough when at a stop light or in park to the point that it will usually die unless you keep one foot on the brake and give it a little bit of throttle with the other. I've noticed it idles fine upon start up when the engine is cold but once the engine reaches operating temp the rough idle kicks in. It still drives fine with no noticeable loss in power. Not sure what's going on with her?


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Old 02-04-2013, 12:27 PM   #2
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It prob already dropped a vlv seat, do a compression check on all cyls, the tool can be rented at any parts store, remember to NOT remove the spark plugs till the engine has cooled down.
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Old 02-06-2013, 01:11 AM   #3
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I really doubt that it's dropped yet. I'm sure it would be noticeable if it did. I'm just worried it might happen soon.
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Old 02-06-2013, 01:39 AM   #4
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It didn't drop a seat. It would be rattling like crazy and running on three cylinders.

Check the hose to your pcv valve, and I suppose the valve itself. Sounds like a standard vacuum leak.
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Old 02-06-2013, 02:02 AM   #5
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Like this?

Click here.
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Old 02-06-2013, 08:20 AM   #6
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Yea, it definitely doesn't sound like that.
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Old 02-06-2013, 09:20 AM   #7
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That's good, mine was slowing telling me it was about to go bad. I went through a few month off and on with that. It would be fine for weeks then it would start ruff idle randomly sitting at a light and woulnd go away for a couple hours, then be fine again.

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Old 02-07-2013, 08:25 AM   #8
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My 2003 LX did what you are describing everyone once and a while before it dropped the valve seat. It would start acting up, I would turn it off and restart it and it would be fine for a while.
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Old 02-07-2013, 09:48 AM   #9
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does it sounds kind of like a subaru because if so your screwbarued
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Old 02-07-2013, 06:52 PM   #10
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The CEL is on. Scanned for code and got P0171 Bank One Cylinder Too Lean.
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