New to d max need some help.
#11
No lift pump completely stock. Which now I think about it, if my cp3 was bad with that primer pump not getting hard my truck probably wouldn't run. I have absolutely no problems starting the truck it doesn't die the way I drive you can't even tell there's a problem. Until you get on it and need more than 10k rail pressure then it won't make anymore press. What pump are you referring to that your replacing?
#13
You had starting and dying issues though right? You also have a lift pump correct? That's where this gets different I don't have a single sign of a problem till you try to push the truck. It has rail press to start, run and drive just fine. I can even get on the hi way and get up to speed and cruise at 60-70 fine, unless I try to get on it and go faster than anyone really needs to it stops pulling and rail press slowly drops from 10k to about 7-8k with just a tad bit of black smoke and I can still get 18-20 psi of boost. As I slowly lift if I try to run it hard rail press will shoot up to 15-20k for just a sec. I'm starting to lean towards injectors returning too much. I plan to do a return test on the pump and the injectors to further isolate and see if I can find the issue better before I buy anything.
#14
Yes it was starting and stalling . Wouldn't keep prime. I just got the truck and someone put a cheap fuel pump on the frame of the truck . It's all rusted been there a long time . I got 150 miles before it went into limp mode and my troubles began .
Last edited by thunderhead; 12-13-2015 at 08:20 PM.
#15
Yeah I don't have any of that going on, no limp mode , no starting issues no dying issues. Only time I had a problem is after I changed the filter the next Morning it wouldn't start so I tried priming and found out the primer wouldnt pump up. But after I got it started I haven't had a problem since and the primer still doesn't pump up or ever get hard.
#16
#17
I have my boost gauge tapped into the heater port in the intake. Just going to have to efi delete the heater...... the problem was the cp3 pump then about 3 days after I replaced the pump the injectors started smoking at idle.... so I replaced all the injectors also.... what a nightmare that was. Had to replace 3 now of the new ones that were still having high rates. All is good now.