1998 Dodge ram 2505.9 L V8 will hardly idle when cold once it warms up it's smooths out, is there a choke pull off or anything on this engine? Sounds like there's a vacuum leak when it's running really rough but it's fine once it smooths out
Asked by Taurus_442 Feb 08, 2015 at 12:39 PM about the 1998 Dodge RAM 2500 Laramie SLT Quad Cab 4WD
Question type: Maintenance & Repair
3 Answers
there is a couple of things is you could have a sticking IAC Motor (Idle air control motor) and its not letting it open enough ...or you have a bad coolant temp sensor and it thinks that the engine is not cold and not going into the correct fuel loop for a cold engine ...I would take the throttle body off and remove the IAC motor and clean them then after you reinstall them do a battery disconnect for 15 seconds ...the engine may not want to run at first because you reset all the values but just keep it running and once warm restart it several times
Taurus_442 answered 9 years ago
Also upon moderate acceleration the heater switches to defrost every time like there's a loss of vacuum soon as you let go of the accelerator pedal it goes back to the floor position
Did you ever find out what was wrong? This is happening to my 1998 5.9 vin z right now and I cannot seem to find the issue??