Demanchik Posted April 20, 2023 Report Share Posted April 20, 2023 Good day everyone! this is the situation: On a warmed-up car, when you stop at a traffic light, the idle speed becomes 500rpm. This is too low, I noticed that when you stand at a traffic light and press the brakes several times in a row, the idle speed becomes higher, but then it drops again to 500rpm. It's been done: Throttle Body Clean, Spark Plugs Changed,Checked with smoke for vacuum leaks, No check engine light and other, PCV Replaced. And another question, when is the vacuum pump turned on? because I turned it off at all, but it did not affect the brakes in any way, I connected it to the battery - it works. thank you all for your help! Quote Link to comment Share on other sites More sharing options...
2late4u Posted April 20, 2023 Report Share Posted April 20, 2023 which engine, what mileage, have it checked to see if any codes have been stored. Quote Link to comment Share on other sites More sharing options...
Demanchik Posted April 20, 2023 Author Report Share Posted April 20, 2023 Just now, 2late4u said: which engine, what mileage, have it checked to see if any codes have been stored. 3.6 , 224000kms, no stored codes Quote Link to comment Share on other sites More sharing options...
John/Horace Posted April 20, 2023 Report Share Posted April 20, 2023 Codes scan first, MAP sensor maybe. https://www.rockauto.com/en/catalog/dodge,2013,journey,3.6l+v6,1505070,exhaust+&+emission,manifold+pressure+(map)+sensor,11207 Quote Link to comment Share on other sites More sharing options...
Demanchik Posted April 20, 2023 Author Report Share Posted April 20, 2023 I driving about one week with unplugged vacuum pump, no codes, no affect to brake pedal( it is nice and strong braking). When he ever start working? Because i think he is a problem. larryl 1 Quote Link to comment Share on other sites More sharing options...
John/Horace Posted April 20, 2023 Report Share Posted April 20, 2023 No codes on your scanner. Dealer or better high end scanner might see codes. Some scanners only show basic obd codes. Must be sensor that turns on vac pump I guess. Quote Link to comment Share on other sites More sharing options...
Demanchik Posted April 20, 2023 Author Report Share Posted April 20, 2023 1 hour ago, John/Horace said: No codes on your scanner. Dealer or better high end scanner might see codes. Some scanners only show basic obd codes. Must be sensor that turns on vac pump I guess. i use many scanners like launch, and professionals , no codes Quote Link to comment Share on other sites More sharing options...
John/Horace Posted April 21, 2023 Report Share Posted April 21, 2023 (edited) Nice, Good scanners used. Were the old compressed intake manifolds seals reused when plugs were changed. Its better to change them , small air leaks can create cylinder misfire, maybe idle issue. Vac leaks can be tricky to find even with puffer. Does turning on a/c increase engine idle speed, curious. Edited April 21, 2023 by John/Horace Quote Link to comment Share on other sites More sharing options...
Demanchik Posted April 21, 2023 Author Report Share Posted April 21, 2023 14 minutes ago, John/Horace said: Nice, Good scanners used. Were the old compressed intake manifolds seals reused when plugs were changed. Its better to change them , small air leaks can create cylinder misfire, maybe idle issue. Vac leaks can be tricky to find even with puffer. Does turning on a/c increase engine idle speed, curious. intake seal done as well, just forget to wright. when turn on ac it goes up to 600 rpm, but sometime can drop again. When i push i little accelerator idle goes up to 600-650rpm. Quote Link to comment Share on other sites More sharing options...
John/Horace Posted April 21, 2023 Report Share Posted April 21, 2023 You have really covered all the usual issues, it seems. No codes is the most odd thing. As you know, drive by wire cars controlled by very low voltage signals from throttle and pedal sensor to ecm. May have to wait for it to get a bit worse and trigger a code. Something is running right on the edge. Reseat the plugs again to throttle body, pedal, map, etc. I hate parts throwing at cars, but on cheap wear items like CPS or map sensor I sometimes do. Quote Link to comment Share on other sites More sharing options...
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