jmac72187

What is the lowest RPM the car can be at safely?

When I am coming to a stop, put my car in neutral and then press the brakes relatively hard, my RPM's can drop as low as 400-500 RPMs.

Is this ok?

Should I raise my idle? My idle is usually around 650-700.

Dan04COBRA

Sounds like a TPS/IAC issue. I figure you bought the car used? Someone might have fooled around with it usinga handheld tuner.

jmac72187

IAC was replaced and it no longer dies like it was doing. I doubt the car was tuned. It was completely stock and only had 13k miles. It was owed by an older couple who drove an RV.

Could I just replace the TPS? How do I test it?

ShadowDrake

Eh that's fine. If I press the brake hard at a stop the RPM will drop too because you're using all the vacuum for the brake booster. Mine only falls to about 550... normal idle is 650-750. If it's sitting that low for a long period (15+ minutes) it could start to cause issues, but for just stops at lights, even the really long ones, it's fine.

jmac72187

It isn't even that long. It is only down that low for about 1-2 seconds. But it does ge to like 450.