[usmansaleh]

Can you guys help me to figure out the problem!!!

I have two problems in my car.
Mazda 6 2003, 140000 mile, 2.0 engine petrol.

<_<1. Unstable RMP
When I put gear in Neutral or Park My car RMP goes up to 2000 then goes down slowly and stay 1000 + , after driving 10km or more. But less drive its stay normal.

I clean the MAF sensor and throttle body but problem is same.


<_<2. Vibration
I also have small idle vibration in steering wheel and in door. I already changed engine and gear mounts.
But there is still small vibration. But during drive its ok.

Note: When I increase RPM 1000 so there is no vibration. My car Normal RPM is around 800.


Any idea you may suggest.
Thanks

 

[usmansaleh]

Well
I clean IAC Valve
So my RPM is normal now

But Still waiting for Vibration issue. Some one said that drive belt also can create vibration if its not in good condition.
what say you guys???

 

[MrTea]

small vibrations are also hard to tackle over the web, like noises, they are things that you need to feel in order to really know what's going on. you seem to have tackled all the right things so far, so not sure where to go next. though i don't see the belt creating an issue, it's a relatively cheap and easy fix if the vibrations are that bad for you.

glad you got the idle issue worked out though, keep looking around, i'm sure you'll figure out the vibrations as well.

 

[usmansaleh]

so where can I start for vibration issue
normally what are the vibration causes?

All I know about the mounts that I already changed.

 

[usmansaleh]

Today I checked Exhaust System
It is not touching with body frame. Exhaust Mounts are also ok

I also checked spark plugs
while engine was running I removed plug wire one by one.
so the result was:
1 plug wire remove engine loss power but running
2 plug wire remove engine loss power but running
3 plug wire remove engine loss power but running
4 plug wire remove engine loss too much power near to stall

What does it mean ??
Are 1 2 3 plugs are faulty?

any Idea !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!