Help... EFI Engine problems

toby7777Member

Funny how the "Fuel Injection Survey" post came up just before I was going to post.

I am in the middle of dyno tuning my EFI engine and am having a real problem with the engine running poorly at 5000+ rpm. My current setup is:
Weber Manifold with 48mm TWM TB's
Haltech Fuel Management system
54lb injectors
A1000 Aeromotive pump
MSD 6A
MSD Dist

I have scoped the tach signal and signal to coil and everything looks fine at the higher rpm. I have swapped injectors and fuel pump. I have an 02 sensor hooked up to a wide band and readings are great (13.2-13.8) until I hit 5000 rpm and then everything goes haywire. 02 readings at 5000 are all over from 10.2 to 14.8 which to me sounds like a misfire. It feels as if there is a rev limiter installed. The Haltech is the only thing with a rev limiter and that is set at 6500. If anyone has any ideas??

Thanks,
Toby

6/26/058:18 AM

Original Post

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