benjy_26 Posted March 22, 2015 Share Posted March 22, 2015 Hello all. I recently removed my heater control valve on my 87 Comanche, and since doing so, my truck has a noticeable miss at cold idle and smells like it's running VERY rich. Once warmed up, the idle evens out. I pulled my plugs a few days ago and they are black and sooty. Any ideas on what to look for? I'm thinking that maybe my thermostat may be stuck open, or I may have a bad coolant temp sensor. thanks in advance! Link to comment Share on other sites More sharing options...
cruiser54 Posted March 24, 2015 Share Posted March 24, 2015 You plugged the line you removed from the HCV right? Link to comment Share on other sites More sharing options...
benjy_26 Posted March 27, 2015 Author Share Posted March 27, 2015 Yes sir! Link to comment Share on other sites More sharing options...
cruiser54 Posted March 27, 2015 Share Posted March 27, 2015 Check the tube/line to the MAP sensor. Link to comment Share on other sites More sharing options...
benjy_26 Posted March 27, 2015 Author Share Posted March 27, 2015 Will do, sir! Thanks for the tip. :) Link to comment Share on other sites More sharing options...
cruiser54 Posted March 27, 2015 Share Posted March 27, 2015 Will do, sir! Thanks for the tip. :) My pleasure as always. Link to comment Share on other sites More sharing options...
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