1989 Dodge Colt high idle/ leaky plug

HUNTINDOG51

MEMBER
1989 DODGE COLT

Engine Mechanical problem
1989 Dodge Colt Front Wheel Drive Automatic 110000 miles

dodge colt wagon 1.5L

I have 2 different questions but both might lead to the same thing. The first being that there is this plug underneath the manifold and it has started to leak oil. What is this plug? Freeze plug? It has a wire going to it.

Second, is for the past 3 months now the motor has a really high idle. Like a 2500 rpm idle. I have tried spraying cleaner through the fuel injection and all that stuff. Doesn't seem to do anything. Is there some kind of sensor that would effect this? I also change the airflow sensor thinking that was what it was an it wasnt!
thanks for the help

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

The first being that there is this plug underneath the manifold and it has started to leak oil. What is this plug? Could be the oil pressure sending unit-Freeze plug will leak antifreeze not oil.

High idle:

Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor.