pederl Posted November 13, 2010 Share Posted November 13, 2010 Question, I have a 1989 4.0, do I have a choke, my engine will start but not very good. New fuel filter, plugs, wires, Link to comment Share on other sites More sharing options...
tbrand Posted November 13, 2010 Share Posted November 13, 2010 If you mean a manual choke, no. Can you be more specific about the problem you're having? Does it start ok, then run rough, or is it just hard to start? You could be looking at a lot of things, including distributor cap and rotor, vacuum leaks, any number of engine sensors or a bad fuel pump. Link to comment Share on other sites More sharing options...
pederl Posted November 13, 2010 Author Share Posted November 13, 2010 I have replaced the rotor and cap. It is a manual and it starts ok, but it runs really rough. Link to comment Share on other sites More sharing options...
pederl Posted November 13, 2010 Author Share Posted November 13, 2010 I also cleaned the idle speed motor and the oxygen sensor. Link to comment Share on other sites More sharing options...
Pete M Posted November 16, 2010 Share Posted November 16, 2010 "cleaned" the o2 sensor? Link to comment Share on other sites More sharing options...
Naterenfo1 Posted November 17, 2010 Share Posted November 17, 2010 Definitely could be an exhaust issue. a plugged up catalytic converter could throw your engine off quite a bit. also: Air filter? make sure no rocks or anything ridiculous is in your intake. EGR issue? maybe something with the EGR is being held open, and releasing way to much exhaust back in. (is there an EGR in an 89? or is that pollution pump garbage in there?) good luck :waving: -Nate Link to comment Share on other sites More sharing options...
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