Low idle

ANTONY11

MEMBER
2007 DODGE CHARGER
3.5L
V6
AUTOMATIC
80,778 MILES

Hi, I need someone to help me out real bad as this year my car has been in the workshop more than on the road.

My car has been having radiator problem from beginning of 2019 hence I changed all the radiator parts on my car to find out it was a blown head gasket.
I had changed one of the short runner valves as well the knock sensors because of the radiator problem.

After I got my car it was fine for a couple of weeks but later I had given it a sudden rev and stopped and the rpm was below idle (750). It would stay on idle when I would go at 80 km/hr and stop. It would stay for a while but would drop later. No check engine light as well. I changed the air filter but no change in the idle. Currently even after I start my car it goes straight to low idle and stays there between 750 and 500. If I brake too hard it may touch 500. So when I am at traffic light I put the gear neutral and it would be fine

I had checked for codes I found a code for 1004 but it wasn't written P1004.

1 Reply

CARADIODOC

MECHANIC
33,873 POSTS

Low idle speed on Chrysler products is caused by the Engine Computer losing its memory when a battery cable is disconnected for some other service or repair. Everything else is relearned as soon as you start driving again, without you even noticing, except for "minimum throttle". The computer needs to see a very specific set of conditions for that relearn to take place. Until that occurs, the computer won't know when it must be in control of idle speed.

To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.