car Rpm when first start in the morning is around 950rpm and drop to 750 rpm after driving and shut off for about 30minute,start engine put in drive and the engine rpm drop very low like about 450 then engine start idle bad push on gas pedal engine start back fire shut off car or put into nutral push gas pedal rpm goes up engine run fine after, sometime i stop the car shut engine off and restart it will run fine after it will run fine with the ac off
engine stall ,low rpm , after the car seat for about 30 minute on 2002 Dodge Dakota
by mau808 in Tempe, AZ on May 08, 2011
2 answers 1 comment
ANSWER by DaveJHM on May 08, 2011
An engine performance diagnosis needs to be performed -- there could be a fuel pressure issue, an air intake issue, vacuum leaks, etc. All guesswork until a diagnosis is performed.
ANSWER by Johnny Mopar on May 10, 2011
Low Idle speed or Intermittent engine stalling when taking foot off accelerator pedal (coasting) or coming to a stop is frequently caused by a dirty Throttle Body. The throttle plate and bore may become coated with contaminates from the intake system. This restricts the amount of air flow past the throttle plates at closed throttle to allow the Idle Air Control motor (IAC) to compensate and keep the engine at it’s programmed target idle. If the throttle body plate and bore are coated with contaminates, perform the procedure to clean. On some engines, removal of the throttle body is not necessary. It is not necessary to remove the throttle body on your vehicle. . Spray the entire throttle body bore and both sides of the throttle plate with Mopar Throttle Body Cleaner, p/n 04897156AA. This will remove the bulk of the contaminant. CAUTION: This cleaner should only be used in a well ventilated area. Do not allow contact with skin or eyes. Rubber or butyl gloves and safety glasses are recommended. Wash thoroughly after use. Do not ingest. NOTE: Use only Mopar Throttle Body Cleaner, the use of other cleaning agents may damage components of the throttle body. While holding the throttle open (engine off) , use a small, (1” x 1”) piece of green Scotch Brite scuff pad, (or soft bristle brush), clean the throttle body bore and throttle plate, (including edges). NOTE: It is important that this cleaning procedure be performed thoroughly and completely. The edge of the throttle plate, and the portion of the throttle body bore where the throttle plate comes to rest are the most critical areas where the cleaning should be concentrated. These areas must be free of all deposits when the cleaning is completed. Thoroughly clean the throttle body with Mopar Throttle Body Cleaner, p/n 04897156AA, and blow dry with compressed air. Inspect for any foreign material which may have been left from the cleaning process. CAUTION: Do not blow shop air pressure directly into the throttle shaft or throttle body housing holes.
COMMENT by mau808 on May 15, 2011
I clean the throttle body with the spray cleaner 04897156AA use about one can and half and also replace the IAC it was full of carbon ,did a tune up ,the idle goes up at start but soon as i put in drive and drive off about 1feet it start choking and backfiring ,if i stop and push on gas pedal the idle is fine or i shut the engine off and restart it will run fine, i also have the injector clean through the rail . this happen when i let the engine seat for about 1or 2hour if i startin less then 5or ten minute it would not chock and backfiring .?