Wierd starting issue

[Dave Stark]

My Comanche starts & runs a little rough cold, but once it is warm it runs great. It usually takes two attempts to get this thing going, after that it does not die, but can hiccup & backfire until it is warm. :help:

 

Here is the info on what i have done so far:

 

-1991

-4.0 OBD1

-5 speed

-2WD

-160k miles

Parts replaced:

-spark plugs, wires, cap & rotor

-Coolant temperature sensor

-Cleaned A/F (K&N)

-Cleaned throttle body

 

I'm happy to have found this great site & plan on doing my own project write-up soon..... :banana:

[garyindiane]

This might help you troubleshoot...

 

http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm

 

-Gary

[Geonovast]

Trying replacing the O2 sensor.

[Dave Stark]

Already replaced O2 sensor, no change. I think i have narrowed it down to the manifold air temp sensor, but we will see. :nuts: I'm also going to change the fuel filter while I'm at it...