2.3 Running really rich at idle


chadzeilenga

10+ Year Member

Joined
Sep 21, 2007
Messages
5
Points
3,001
Age
44
Transmission
Automatic
I've been trying to troubleshoot my 1989 Ranger with Dual Plug 2.3L

So far I've done the following
Fixed timing belt (was off by 2 teeth)
Replaced plugs & wires (#1 wire had a lot of corrosion on it)
Replace pass side coil (it was cracked)
Replaced Fuel Pressure Regulator
Cleaned IAC by filling it up with carb cleaner & letting it soak, then I blew it out with compressed air
Replaced O2 sensor
Removed catalytic converter

The engine runs great with 1 or 2 vacuum lines unhooked. It seems to lean out the mixture and I get a pretty good idle. With the vacuum lines attached it idles really rough and wants to die. When I hold the RPM's around 2k it is smooth and runs fine. It runs like this cold or hot.

Currently on the list to do is:
Clean out Throttle Body
Check timing again
Check the TPS

Does anyone have any suggestions?

Chad
 
It's probably a bad oxygen sensor. The same thing has happened to me. As for disconnectiong the vaccum lines; that will lean out the engine because their is unmeterd air entering the engine.
 
Brand new?

You mean the brand new O2 sensor is bad?
 
Check the wires up from the O2 sensor also.Have seen a new o2 sensor that was bad.Good idea to check TPS.
 
Your '89 computer is quite capable of doing self-diagnosis. Have you checked the computer for error codes?

Just tossing parts at the truck in hopes of fixing it is really a waste of time, effort and money.
 

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