Hi All,
Car: 2008 Altima 3.5 CVT, about 115k miles. Sole owner of the vehicle. Spark plugs replaced recently at the dealer. I'm not really a "car guy" but I've been able to handle most repairs myself.
I've got a rough idle while stopped or in neutral where RPMs drop below 700, the engine will shudder for a few moments and then come back up to normal. Rinse and repeat every 20-30 seconds or so. I'm going to go through my list here this weekend, but I have a few questions.
- Check / Clean MAF & Intake.
- Check / Clean Throttle Body & Sensors (Next to the intake? That area)
- Check / Replace Vacuum Tubes.
- Check / Clean the Butterfly Valve on the left side if facing the engine. (Opposite the intake? I don't know what that's called.)
- Seafoam
- Throttle position reset procedure
1) Does anyone know the ID of the little vacuum tubes? Looks like 3.5 or 4mm. I'm going to order silicone replacements.
2) I hear a sound coming from the butterfly valve / left side when facing the engine. The best way I can describe it is the "hiss" or "whine" you hear when you turn a water faucet on partially.
(EDIT) -- The hiss does not stop immediately when the engine is cut off. Goes for a second or two more.
3) Any other suggestions for this?
Thanks