jons01f150

Now both banks running lean and surging like crazy!!!

Can't find any real vacuum leaks

Any ideas

Please help

2001 F150 5.4l

joshtowal

If you have a scan tool that you can watch the fuel trims, o2 sensors, and rpms, that would be ideal if you're looking for a hard to find vacuum leak. Only thing to do here would be to go back over everything. Make sure that all hoses are hooked up and be 100% sure that the gaskets are sealing and bolts are torqued to spec.

twoskinsoneman

what kind of intake? I would be checking the install carefully

Marc D

Use a can of carb cleaner and spray around the manifold while the engine is idling. If you hear the motor increase in speed where you spray will be your leak. Also check your PCV valve to make sure it's not stuck open.

jons01f150

Its a Dorman

What should it be torqued down to

I read a lot of different answers on this

JCR 56

18ft.lbs.

twoskinsoneman

What about the spacers between the upper intake and lower? I noticed my dorman came with two sets at different heights depending on the P/N of the intake coming off. If you don't use the right ones the gasket won't be compressed properly.

LEN671

Any updates on this issue?

What was the readings on Banks 1 and 2?