rough idle

chaby_91 said:

^it's not a bad idea, but I'd rather find and fix the issue than mess with the idle

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No CEL confirmed.

I am confident that my engine is in good condition. I remember doing a compression test, leakdown? test and fuel pressure test. I didn't go any further because I got good results. That was about 10-15k km ago. The engine now has about 157k km, it's still fairly... "young"

I did the power balance test. Any spark plug wire I disconnected made the engine angry.

I disconnected the FPR vacuum line, while preventing change due to vacuum leak. Doing that didn't seem to affect the idle in any way.

There is no fuel filter on this car. Only a screen in the fuel tank.

The car is a manual. Only the idle is rough, between 750 and 1000 rpm. I have not noticed any other issue. If I slowly raise the rpm, it'll keep the shaking low until 1k rpm. If I press harder on the accelerator, the engine vibrates quite a bit then smoothes out after 1000 rpm

I also used TKO 2000 fuel system cleaner through the intake manifold and seafoam through the intake tube. It seemed to have made the idle just a bit smoother. I also filled the tank with premium gas. I did these after talking with 2 mechanics/techs.

I'm thinking that since the only previous owner ran the car like a 200 years old woman, maybe there is some pipe/line somewhere that's filled with gunk or carbon deposit.

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