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2003 Honda Pilot, I have trouble finding why my pilot getting weird idle that does go up and down non stopping at all. I have replaced timing belt, IAC and TPS... still cannot solve it. When the engine cold, it stay smooth at 1,200 till after warm up it go up and down
 

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2003 Honda Pilot, I have trouble finding why my pilot getting weird idle that does go up and down non stopping at all. I have replaced timing belt, IAC and TPS... still cannot solve it. When the engine cold, it stay smooth at 1,200 till after warm up it go up and down
Check for vacuum leaks 1st.
Make sure your intake tube is tight, sealed, not cracked.
Is there a check engine light?
 
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Yes, I would also say to start by looking at the air intake tube, where there might be a crack on the underside near the left hose clamp. Here's a very special VIP PIloteers exclusive; intrepid member @andywatson was gracious enough to post a picture of her crack. :)

radiator recommendations 04 pilot

It can sometimes happen when people bend the old air intake hose a little much. :)

https://d2n97g4vasjwsk.cloudfront.n...3.5L V6/Air Filter Engine - Part 1 - 480p.mp4

Agree with considering the PMS PVC valve as well. How long has it been? Just be very, very careful when you do. :)

 

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I agree, sounds like the typical vacuum leak.

Find the leak with smoke:

Find the leak with Water, Propane, or Starting Fluid:
On a 2003, I'd find it best to just go ahead and replace every rubber hose on the vehicle. I hate cigar smoke, lol.
 
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