altua

I have recently started noticing that after driving at highway speeds(65 to 70 MPH) for a while, when I slowdown and come to a stop, car tends to have a rough idle, reading is close to 600 rpms and I feel the car vibrating.
I am not sure if this is due to EGR or something else or maybe something in my head since I dont see this issue on a cold engine or city driving(no highway driving before).

ezone

How many miles?

Compare to another identical 2010 Civic.

No issues as of yet on any that new, except for a crash job that was shoddily repaired.

altua

my car has 41k miles on it. I dont personally know anyone who owns a 8th gen civic.
I usually get oil changed at the dealer, replace the air filters myself and have not had any repairs done.

ezone

There is no way to adjust the idle speed. The throttle is fly-by-wire.
If the EGR has a problem, it should set a code.

I have not witnessed any that new with motor mount issues.

You have 5/60 powertrain warranty.







Step #1: Verify the complaint. Prove there is a problem.
Have the dealer see if your complaint is legit--- or average-- for the cars.
Or take a used one for a test drive while you are there for your oil change. Get the seafoam out of there.

altua

Thanks! I am taking my car in for an oil change tomorrow.

ezone

Don't say anything about what you put in it.

Some people might try to void your warranty over stuff like that.

altua

eastsider

OK, here's a comparison.

I’ve had my new-to-me 2010 EX (AT, 25.3K miles) for just about a month now. Everything’s been working fine, so I haven’t paid much attention to exact RPMs at idle, etc.

But after reading altua’s post, I modified my first trip of the day this a.m. to include a 9-mile freeway leg at 65-70 mph before stopping and checking idle RPMs. Results: when stopped in “D” after a few seconds, RPMs stabilized at around 625-650 or so, with smooth idle like always, no vibration.

Hope you find a solution to your problem, altua. Been to the dealer yet?

altua

I got the oil changed yesterday and had the dealer look at the car. They did not find anything wrong with it, they also said that since computer controls everything, if something was not right, it would have thrown a code. But, did mention that winter blend can cause issues with the engine response. Since I never noticed this before, they asked me to wait till summer blend is available.
Also recommended that I idle for a few minutes to bring the engine to operational temperature before doing any driving (incity or highway- I almost always reach operational temp before hitting the freeway)

ezone

Seasonal fuel blend changes are supposed to be seamless, although they sometimes aren't. Extremely rare for the average consumer to notice an issue that is truly related to winter/summer fuel (other than gas mileage), unless ambient temperatures are unseasonable.

^^^This is BS^^^.


This part of the answer is kind of what I expected to hear.

Although it usually takes a real oddball running problem to escape the computers' watchful sensors, the computer can only sense certain things. Vibrations are not one of them, unless caused by a misfire.

Did you test drive an identical car?

You have a vibration when the engine idles, or is it a rattle? Bang on the front edge of the hood with your hand, see if it rattles easily.

altua

I am the first owner of the car, so unless they banged it in the factory or in the delivery truck to dealer, no incidents.
Its a vibration, once the car comes to a stop, it gradually starts. Like engine and car body frequencies are matching. It feels like my seat suddenly has a vibration massage.
Forgot to mention, they also looked at the engine mounts and did not find anything wrong their either.

markx916

How bad is the "vibration" on the car? I am assuming its a base model civic? I use to own a 2007 Civic LX, it idle around 650 - 750ish or so, it idle pretty quiet but small vibrations. I was always paranoid and thought it was an issue so I brought it to dealership they said it was fine. If you are idling around 650 - 750 you should be fine. It might just be that you are paranoid like me lol since it was a "newer model" car. I had it when it was 2009 lol so it was about a 2 year old car at that time...

ezone

They are NOT "glass smooth".
This is why I said to compare to an identical car.

What appears to be around 600 on the tach is a normal hot idle speed. It's OK.