Lean at 4000RPM and Engine Dies

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May 12, 2016 | 10:17 AM

#16

StreetEvo

Evolving Member

Joined: Sep 2005

Posts: 109

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From: Va Beach, VA

Does it spike rich prior to going lean? If this is occurring, you could be flooding the cylinder which will sometimes show as a super rich spike followed by running lean. Pull the plugs and see if they soaked.

May 17, 2016 | 09:38 AM

#17

mrfred

EvoM Guru

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Joined: Mar 2006

Posts: 9,675

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From: Tri-Cities, WA // Portland, OR

Quote:

Originally Posted by ReivaXVrai2

I have finished my current build on my 05 Evo 8, and in the process of tuning, we can't get the car above 4000RPM. When it gets there, it shoots to 21AFR, and tries to die. I'm running a Walbro 450LPH E85 pump, -8AN lines to the rail, Fore Fuel Filter, FIC rail, FIC 2150cc injectors, FuelLab AFPR, and stock return line. My injectors are seeing 10.5v with the car off, but the key on, when I ground the multimeter on the plug ground, but 12.5v when I use the battery ground. I can't figure out what's going on and it''s frustrating the **** out of me. Help, please?

And if you read the battery with key on / eng off, it says 12.5 V?