creepin' Posted March 17, 2018 Share Posted March 17, 2018 Help I have a 92 Comanche big ton with a 4.0 6 cylinder. I have been chasing a problem with it idling rough, it started last year with it starting hard and then a rough idle and it would just randomly shut off sitting at a light. New parts- fuel pump last year, map sensor, tps, iac, fuel filter, cps, o2 sensor. tested fuel pressure 32psi at idle and jumps to 40psi when the vacuums line is removed from the pressure regulator. PLEASE HELP ANY IDEAS Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 17, 2018 Share Posted March 17, 2018 Check for fault codes. https://comancheclub.com/topic/28111-reading-obdi-91-and-92-mj-fault-codes/ Link to comment Share on other sites More sharing options...
creepin' Posted March 17, 2018 Author Share Posted March 17, 2018 I don’t have the check engine light coming on will it still show a fault code? Link to comment Share on other sites More sharing options...
omega_rugal Posted March 17, 2018 Share Posted March 17, 2018 clean the inyectors? TPS out off adjustment Link to comment Share on other sites More sharing options...
creepin' Posted March 17, 2018 Author Share Posted March 17, 2018 How to you clean the injectors? i don’t it would believe the tps is out of adjustment the brand new one is in there just the same and the problem is still the same. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 17, 2018 Share Posted March 17, 2018 2 hours ago, creepin' said: I don’t have the check engine light coming on will it still show a fault code? Yes. At least 90% of fault codes never trigger the CEL. Do this before anything else. Link to comment Share on other sites More sharing options...
creepin' Posted March 17, 2018 Author Share Posted March 17, 2018 Ok I cycled the key on and off and did not get any codes from the flashing check engine light on the information center. Will a scanner show more codes than that will? Link to comment Share on other sites More sharing options...
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