Low boost PSI

[Diablo386]

(08-22-2018 )Rawze Wrote:  

(08-22-2018 )Diablo386 Wrote:  

(08-22-2018 )Rawze Wrote:  

(08-22-2018 )Diablo386 Wrote:  I had a question Rawze.....going back to my ECM with a possibility of a bad program; with all that oil consumption and oil leaking into my CAC and the whole air system would this be indication of me needing a rebuild? Truck never had a spec of oil before the new ECM and now running the new ECM the last day I drove it it used 1 gallon with me running it for 24 hour. Also would it be possible the harness is defective somewhere from when that battery cable shorted and fried my origina ECM and could be why I’m not getting sufficient boost? Thank you sir!

does it have a lot of blo-by?

It’s got blow by but nowhere near smoking like a sailor. Blow by is the same as when it was running good. Truck has 745k miles. Oh and I forgot to add on the thread that my lift pump is not working at all. Used to work before and when I tried starting it the day it was acting up lift pump kept coming on and off by it self and when I came to the fact that I knew it was a bad ECM that left me stranded lift pump never came back on. Installed new ECM and lift pump never came on. Doesn’t read any codes on the cluster only when I replace fuel filters and air gets sucked in becausr lift pump can’t prime so I get a low fuel pressure.

Lift pump can be a bad fuse, bad relay, bad lift pump, or bad ECM programming.

Checked fuse, checked relay...both good, I also checked the ECM wire going to the relay, and it is sending out voltage but lift pump is not receiving it. I’ve been hooking my power probe to the lift pump to get it to prime. It does work tho so it’s not bad. And I haven’t gotten into opening all that wire insulation and tracing that wire from Relay to the lift pump. Burned wire possibly from the short? Or like you said a bad program. I’m spoke with Haggs and he wants to help Look at my computer I just need to get my own computer adapter and software so I can hook up to my truck so he can remote into it and he’s going to inspect everything on the ECm and let me know if i have a bad program.