Engine vibration

[Bluj40]

i had a valve adjustment done in january, and the engine has been through ARX treatments, bilstein flushes, and LC experiments and now has M1 EP 5w30 with LC. the engine super clean , i need to take pics at that.I had used Techron bottles, Gumout Regane and 9 months of Fuel Power. The thing is i still get the engine vibration, even at cold startup, my rpm jumps at 2 and stays at 1500rpm at idle until fully warms up. At 58k miles, could it be timing belt and acessory belrts with the tensioner causing all the vibrations at startup and even im driving? Should i go for a timing belt service?
I have an 02 Accord dx

 

[Papa Bear]

Have a look around cordclub.com

 

[CharBaby]

Honda Accords, especially the ones with auto trannys, have always had some vibrations. No need for the timing belt service just yet. Every generation Accord that I have driven form 1984 to the present day ones, have some vibes. Sometimes even violent,(in gear at a stop). Usually it's motor mount design. Not much you can do about it. And the vibes are more noticable in the colder wheather. And you can feel it through the steering wheel, dash and floor. Sometimes the more accessories that you use(A/C, Rear Defog) will increase the viberation even more I've talked to some Honda Techs that say to change out the PCV Valve but, I don't really know! The manual trannys had less vibes and often no vibes at all. Even my wifes Lexus has some vibes,(although mild) when stopped at a signal light on a cold morning. Maybe "AccuraTech" will chime in with some good advice.

 

[AcuraTech]

I agree with Char Baby. Alot of Hondas just seem to transmit the engine vibrations throughout the car, especially when cold. It seems to be most noticable in 4 cylinder cars.

 

[glennc]

Inline fours are difficult to design to be free of vibration. Balance shafts can erase vibration from rotational forces, but not much can be done about the uneven combustion forces. The results depend on many things, of course, but the best you can do is make sure your engine is in good tune and that the mounts are in good shape.

That is, of course, short of swapping in a good proper straight six, and - while you're at it - pointing it so it turns the other set of wheels!

- Glenn (just kidding of course)

 

[seotaji]

i noticed that cleaning out the egr and idle air control systems helped the idle shake A LOT.

more than replacing the engine mounts (which i did).

 

[seotaji]

DISCLAIMER: what works for me, might not for you, i offer these tips without any warranty of any kind, expressed or implied.
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with the engine off, i used throttle body safe cleaner.

i removed the IAC from behind the throttle body (rather difficult, but necessary b/c removing it completely requires you to bleed the cooling system), peeled off the figure 8 gasket (found only at dealer) and sprayed away (while holding a rag under the IAC to catch excess).

spray until clean. let dry. replace gasket. start up your car.

also find your EGR system hoses and valve and clean those too. makes a world of difference.

it too has a gasket, but it's made of paper and easy to find.

honda engines have a problem with carbon build up.

my car when new (95 accord) ran like a top, with nary a shake. as it got older, it started shaking more. i still get 27-32mpg with mixed use though

.

 

[Bluj40]

what should i clean the idle air control with?