03 cummins surging while cruising above 80 - Competition Diesel.Com

03five9 · 06-05-2018, 09:13 AM

03 S/O 184xxx Miles brand new Bosch +50hp injectors from injectors direct installed a couple months ago has afe turbo header CAI 4in straight pipe factory programming. I was running about 85 on I10 when it started surging rpms steady but my boost gauge was jumping between 8-10psi so I changed my fuel filter which was replaced only about 3k miles ago took it out on the freeway again same thing but I can bring it down to 75 and it’s perfectly normal maybe even 79 lol but at 80 boost starts bouncing again. Saturday I found my turbo flange gasket split and I had a broken bolt. Pulled turbo replaced flange and bolts and haven’t been able to test out if that fixed it. I don’t have any fuel gauges but the lift pump was replaced 35k miles ago so don’t think that’s the cause. So does anyone think that could cause my issue and maybe fixed it or can I have some more insight and thought on the what the issue is? Also if I’m cruising 80+ I got plenty of power can pull 80-100 steady

03five9 · 06-06-2018, 11:47 AM

Ttt

Brokentoys · 06-06-2018, 03:29 PM

Do you have a rail pressure gauge or a way to see commanded vs actual pressure?

03five9 · 06-06-2018, 04:07 PM

No rpg I’m hoping to get with my cousin this weekend and hook up the snap on scanner to go for a ride.

03five9 · 06-06-2018, 04:07 PM

No rpg I’m hoping to get with my cousin this weekend and hook up the snap on scanner to go for a ride.

03five9 · 06-08-2018, 08:55 AM

Seems the turbo flange fixed my issue definitely getting better mileage and more boost

06-05-2018, 09:13 AM	#1
03five9 Name: 03five9 Title: Rookie Status: Not Here Join Date: Sep 2017 Member`s Gallery Posts: 17	03 cummins surging while cruising above 80 03 S/O 184xxx Miles brand new Bosch +50hp injectors from injectors direct installed a couple months ago has afe turbo header CAI 4in straight pipe factory programming. I was running about 85 on I10 when it started surging rpms steady but my boost gauge was jumping between 8-10psi so I changed my fuel filter which was replaced only about 3k miles ago took it out on the freeway again same thing but I can bring it down to 75 and it’s perfectly normal maybe even 79 lol but at 80 boost starts bouncing again. Saturday I found my turbo flange gasket split and I had a broken bolt. Pulled turbo replaced flange and bolts and haven’t been able to test out if that fixed it. I don’t have any fuel gauges but the lift pump was replaced 35k miles ago so don’t think that’s the cause. So does anyone think that could cause my issue and maybe fixed it or can I have some more insight and thought on the what the issue is? Also if I’m cruising 80+ I got plenty of power can pull 80-100 steady

06-06-2018, 03:29 PM	#3
Brokentoys Name: Brokentoys Title: Rookie Status: Not Here Join Date: Apr 2018 Member`s Gallery Posts: 14	Do you have a rail pressure gauge or a way to see commanded vs actual pressure? __________________ 2004.5 2500 qcsb Auto MM3, Sxe369, 100% over injectors, 12mm cp3, AD200, trans build by PDD all shafts billet, high stall Dpc converter, headstuds, 103 springs, HD pushrods, ect...

06-06-2018, 11:47 AM	#2
03five9 Name: 03five9 Title: Rookie Status: Not Here Join Date: Sep 2017 Member`s Gallery Posts: 17	Ttt

06-06-2018, 04:07 PM	#4
03five9 Name: 03five9 Title: Rookie Status: Not Here Join Date: Sep 2017 Member`s Gallery Posts: 17	No rpg I’m hoping to get with my cousin this weekend and hook up the snap on scanner to go for a ride.

06-08-2018, 08:55 AM	#6
03five9 Name: 03five9 Title: Rookie Status: Not Here Join Date: Sep 2017 Member`s Gallery Posts: 17	Seems the turbo flange fixed my issue definitely getting better mileage and more boost