Engine stumbles after injector install

[Gray Brick]

Installed upgraded Deatschwerks and car stumbles at light load. 


idle and under 20% throttle while driving the Flex runs fantastic.


No leaks in intake or associated items... did pressure test.


What gives?


Any suggestions?


Thank you.

[bpd1151]

Did you have your tune file adjusted for them?

I would start there 1st......

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[glock-coma]

Silly question but did you remember to plug your HPFP back in?


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[TopherSho]

Installed upgraded Deatschwerks and car stumbles at light load. 

idle and under 20% throttle while driving the Flex runs fantastic.

No leaks in intake or associated items... did pressure test.

What gives?

Any suggestions?

Thank you.

Is this under high gear at cruising speeds?   IE 5th or 6th gear without a downshift?

[Gray Brick]

Tune was adjusted for them.


I will check the HPFP tomorrow.


Engine runs perfect in each gear until 20%+ throttle.

[TopherSho]

Tune was adjusted for them.


I will check the HPFP tomorrow.


Engine runs perfect in each gear until 20%+ throttle.

I agree,  if it bails on and after 20% its fuel delivery.  the handheld should show a sudden drop in fuel rail pressure .. if it shows steady pressure i start thinking leaky injector or wetting the plugs somehow.   

[Gray Brick]

I will check the LPFP and HPFP for drop this weekend.


Deatschwerks seems to think it is the tune. Waiting to hear back from Brad.