1994 jeep 4.0

[Johnson110]

question: how is a distributer cap good for? i changed mine to today after about 36k miles on it! the engine was running funking in the morning, plugs air,gas filter all changed figured i change out the cap and rotor no crackes in it but miles getting high on it! just hate to change parts and not get a response out of engine! engine has 143k on it runs good except for early in the morning!

 

[Lou C]

Re: 1994 jeep 4.0

I usually change mine at the same point, I do the plugs, dist cap and rotor every 30K miles, and do the wires every 60K miles. You may have to clean out the throttle body, or you may have a sensor starting to not read correctly for it to not run well when it is cold. Usually ignition faults will be the same hot or cold, but the fuel enrichment system in the fuel injection may have more relevance to your problem. Mine only has 75K miles on it, runs good hot or cold.

 

[Johnson110]

Re: 1994 jeep 4.0

Thanks Lou for the response, i think you are right bout it being fuel related. i guess it still was worth doing the cap and rotor being that many miles on it!

 

[jimr]

Re: 1994 jeep 4.0

clean or change the Idle Air Control it is probally sticking some when cold

 

[crazy charlie]

Re: 1994 jeep 4.0

Try some seafoam additive or get a fuel injection servicing.I have a 95 with 156k on it and it runs just like my wifes 2004 jeep with 5k on it.Charlie

 

[Johnson110]

Re: 1994 jeep 4.0

Thanks for response, where is the idle control valve located on that 4.0 is it right on the troddle itself?

 

[jimr]

Re: 1994 jeep 4.0

should be on the throttle plate assembly. it adjusts the amount of air the engine get at idle with throttle plate closed