It happens mostly when my car is cold yet. When I idle in "drive" sometimes I feel something like stroke which shakes the whole car. It's not very audible but it feels very well through the body. In these moment rpm drops about 2-3 points and then comes back.
What can it be?

 

Bump...
Anybody???

 

i got the same problem. i dont know what it is though, ive been told to replace fuel injectors and pistons cause my car runs on 4 cyl as of now.

 

All my injectors have about 11 ohms resistanse which is good but still doesn't guarantee that they are ok. And I didn't notice any power loss recently so I can presume that my pistons are working more or less fine.

The bottom line is that it is a weird behaviour and so far it looks like only two of us have this problem...

 

Try tightening the loose nut behind the wheel. I hear that solves most problems...

I take you you guys are autos? I've never heard of this situation with them... make sure your fluid is up and bright red!

 

I even replaced that nut - no help

Yes it is auto. It's really time to change my tranny fluid but I have a doubt that it causes car to shake so badly (almost jump). Anyway thanks for the advice. I'll change the fluid soon.

 

Run some PRESSURIZED FI cleaner through the system and see if it helps.

 

What is "PRESSURIZED FI" ? Is it some kind of fuel/injection system cleaner? Where can I get it?

 

it's the type of cleaner that is actually hooked up to the fuel rail and the car runs off of it for like 5-10 minutes. It's done by repair shops, not some thing that you'd do yourself.

 

Thanks dude. I'll talk to my mechanic about it.

 

-how about trying the EZ stuff first.
-check all your... spark plugs,wires, rotor, cap.
-start the car and let it warm then open the hood and see if it has a knock! u will see the engine shake every few sec. (when a chamber is not fully combusting)
-whats the cars idel speed?,
-does it have a hesitation?
-what does the exhaust look like? is it very black? does it smell like fuel?

 

Ok, one by one.
1) Spark plugs just replaced recently. Wires, rotor, cap - to be replaced. Not sure if it can be the cause.
2) No, car doesn't have a knock according to your description.
3) Yes I have a problem with idle speed - it's about 800-850 in neutral but as low as 650 in drive. I'm trying to find a vacuum leak with no success as of yet.
4) Yes, it does have very slight hesitation. I presume it because of a vacuum leak as well.
5) Exhaust look normal. Not black.
Plus I have at least 2 broken exhaust studs.

Idle speed problem and hesitation appeared after my accident two month ago (I rolled over). But this "shake" thing happened before the accident.
I definitely know that I need two fix my idle problem and replace wires/rotor/cap before trying to fix this shake thing. I just wanted to know if somebody else in the forum had these symptoms with their car.