Low Idle, Coolant Smell

[MAZSPEED12]

Whats up,

When driving the rpms are fine, once at idle, the car will drop to 900 rpm then slowly fall down to 300-400 rpm, and the whole car just vibrates. Then if you rev the car up in netrual it will do the exact same. Also their is a coolant smell, no visible leak, no white smoke, just noticed resivoir dropping it levels. Any clues would be awesome.

Thanks

[BOOSTR]

Coolant smell with the stock spring clamps is 100% normal and resolveable by changing out those stupid ass clamps to the traditional type on all coolant hoses/lines. Other than that the return elbow has leaked in some cases.

How many miles on your car? Dipping idle could have several causes. Any other driveability issues?

[MSP2024]

my return elbow was leaking you could see where it leeked on the intake. you might wanna check your vac lines for the dipping idle

[MAZSPEED12]

The cars got about 48,000 miles, only other thing during acceleration their is a little bit of hesitation and bogs down a bit

[BOOSTR]

Hesitation is also normal with the stock pcm. Unflashed, it will be worse and more consistent. With your mileage I'd change the plugs, pcv, air filter if you have not already. Get some clamps to while you are at the parts store. Those items should solve your dipping idle and coolant smell issue. Might want to run some seafoam to decarbon the engine and put the rest in the tank with a fillup also.

[MAZSPEED12]

Hey Thanks For The Input I Try Getting Those Items Done, Which I Had Already Planned, Gotta Start Some Where.