Hi everyone! the last couple weeks my truck has been acting funny. It seems to hang between 3-4 and the 4-5 shifts. If I watch the rail pressure on my cts it sometimes drops as low as 4.5k lbs, but it never throws a code. I rebuilt the filer head last week and now it seems to build pressure better, but then just falls off. At first I thought it was defueling real bad, but it does it even at 1/2 throttle in my 40hp tune. what could be causing it? It is random it doesn't do it every time
LBZ: dropping rail pressure with no code
- Thread starter Jon7891
- Start date
thank you! That's what I was thinking. I ordered a race valve this afternoon but I just wanted to see if anyone else had any ideas.
Ok guys here's the weird thing. tonight I pulled a 9,000lb toy hauler and it didn't lose rail pressure once. I know that its not a lot of weight but I would think that with the extra load it would drop??