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Discussion Starter #1
05
206,000 miles

Since I purchased this pilot 3 years ago, it has had a shudder at idle. Its not mounts or anything like that, it feels like its the engine/fuel/battery. It was a lot worse when I got it, thats when I went tracking the issue down. Cleaned the top end + intake manifold + throttle body, did timing chain, mount, water pump, OEM recommended plugs and coil packs. I don't remember what the plugs were, but the coil packs are denso. Replaced the battery and cables as well. I'm not sure what helped the shuddering, but something did, because its a lot better. Since then, its been a mild shudder, but its still there. Now it seems to be getting a little worse.

What do you think it could be? Anyone had similar issues? Common vacuum leak? Alternator? Dirty injectors?
 

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Your engine is at 206K miles. Have you reset the valve clearances ? If not, it's due ASAP --could be the cause for a rough idle.
 

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Discussion Starter #3
Your engine is at 206K miles. Have you reset the valve clearances ? If not, it's due ASAP --could be the cause for a rough idle.
I did have the valves "adjusted" by a shop. I had this done because at about 180,000 miles the timing belt tensioner failed and the belt nearly slipped. Had them adjusted just in case. Is this something I can check/rectify myself being a weekend mechanic? I don't have a TON of experience, but I am fairly mechanically inclined.
 

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No codes?

Mine coded EGR around those miles. Idled terribly highway fine. Held in by two very tight bolts. I was lucky to break them free without too much of a struggle.
 

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Discussion Starter #5
No codes?

Mine coded EGR around those miles. Idled terribly highway fine. Held in by two very tight bolts. I was lucky to break them free without too much of a struggle.
No codes. I almost wish there was so I would know where to look.

I wonder if its some sort of vacuum leak?
 

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Vacuum leaks usually result in high idle, not rough. Rough means lack of fuel, lack of ignition or lack of air.
 
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