2018 MD115A2 <br>Progressive problem started with a hard start. While cranking, the engine will fire and cough white smoke intermittently. After multiple tries it will start with a cloud of white smoke and rev to a high rpm. Comes back to idle 800 rpm. It ran fine through all rpms. After shut down it will start fine if you started it within 15-30 minutes. After sitting longer than 30 minutes the same hard start process. This has been doing this for the last four outings with multiple stop and starts while fishing.<br><br>Problem has progressed to hard start, rough idle, running around 1200-1600 rpm it runs rough and almost stalls, bump it up past 2000 rpm it will stable out and run fine. Bring back down to idle and it idles fine with no misses while waiting our turn to at the boat launch over 10 minutes in and out of idle. <br><br>On muffs in the driveway. No hard start, idles fine until holding throttle around 1200-1600 it'll start missing and wants to stall, now bump above 2000 rpm, it's missing with erratic rpm fluctuating up and down when trying to stay at a set rpm. When throttling down to neutral, it will stay reving above 2000 rpm missing with erratic rpm. Sometime it'll come back down to idle, but idle rough. Other time have to turn key off to get rpms down. Immediate restart it'll idle, but rough and will continue the same process when throttling to 1200-1600.<br><br> On the muffs I've had it start as normal and idle for over 15 minutes and throttle straight to 2200 rpms and leave it there for 5 minutes with no issues at all. Drop it down to 1200-1600 rpms for a bit and the above process repeats itself. Pulling plugs resulted in #1,2,4 half the ceramic is brownish white and other half black. Also slightly wet. #3 plug brownish white and dry.<br><br>Coils ohm test ranged from .7-.8 and 14.29-14.6<br>Fuel injectors 37001 ohm test from 2.3-2.4 also applied 12v, heard clicking and fuel would come out exhaust<br>Air injectors ohm test 1.8 all four<br>TPS closed 4.7, 4.8, .8, .79<br>TPS wide open 4.6, 4.8, 4.2, 4.3<br>Air rail psi 100<br>Fuel rail psi 110<br>compression all four 120 psi<br><br>Self diagnostics:<br>1. 100-200 hours<br>2. battery voltage low once<br>3. air compressor cooling water abnormally high <br> cooling water temperature was once high (prior owner)<br>4. air compressor cooling water temp high<br> cooling water temp was once high (prior owner)<br>5. oil was once low (prior owner)<br>6. CPS malfunction<br> wire was once broken/CPS malfunction<br><br>I have cleared all codes to see if CPS malfunction would come back, it has not. No other codes have come up either.<br>I have done an ECU/TPS reset.<br><br>Thankful for any help.<br>Bryan
Forgot to add CPS ohm and gap were good.
Forgot to add CPS ohm and gap were good.
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