[GRABBE]

Idling issue with my 03 cummins my rpms bounce around from 500 to 1500....it will idle down and nearly die then idle back up to 1500 then down again...its just when its idling....runs like a top down the highway....doesnt burn any oil or have any blow by......can anybody shed any light on the situation on what this might be....and how much $$$$$ to fix....thanx



03 dodge 3500 4x4 dually 6spd man....sittin on rockstars with a hydrolic haybed

 

[superman279]

You need to monitor rail pressure during these conditions, that will tell you a lot.

 

[GRABBE]

how do i go about monitoring the rail pressure is there a gauge i can buy and hows it work??

 

[LNaugle]

Sounds like the fca but you deffinetly need to see what fuel psi is doing... Hows it start in the am?

 

[GRABBE]

Whats a fca cost and how hard is it to replace??

 

[GRABBE]

Its starts fine in the morning regardless of how cold it is.........

 

[superman279]

You need a rail pressure gauge or a scanner that can monitor PID's. If the rail pressure is fluctuating (most likely it is), the FCA could be the culprit if you have no other symptoms. It takes maybe 10 minutes to replace it, T25 torx bolts. The manual states that you can take it off and shake it to test it. If you hear something rattle, its good. However, many people on here say that this test is useless, so I wouldn't trust it too much.

 

[GRABBE]

got any ideas on what a (FCA) cost?? sound like a simple fix...But im not familar with the fca...is it pretty simple??

 

[LNaugle]

I dont remeber price... check genos garage... easy to replace...

 

[GRABBE]

Ok thanx for the info.....ill see what i can find out.....

 

[GRABBE]

Could i get this fca from dodge or could i get it from cummins... anybody know a part number for this fca??

 

[GRABBE]

Found a video on you tube about this MPROP or FCA and the guy said he got his from bosch...which was some cheaper than dodge...part number 92840066 does this sound right...would the bosch brand be a good choice???

 

[Moochoff]

1. Dont buy anything from a dodge dealership... And I would get a hold of a shop that can monitor your rail psi. Replacing parts without finding the cause first isn't the way to go about fixing it

 

[LNaugle]

doesnt matter, early duramax uses same one...