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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I installed a magnuson supercharger on a 2007 4.6 liter 3

Customer Question

I installed a magnuson supercharger on a 2007 4.6 liter 3 valve gt its performance is fantastic however it tends to pulsate or surge when I try to keep it in a steady state or cruise control. It has a bypass valve for efficiency under low engine loads I bypassed this but the surging continues. Under full throttle it is not noticeable. Any ideas?
JA: Have you checked the fuse? What size is your engine?
Customer: yes, 4.6 litre
JA: What year is your GT?
Customer: 2007
JA: Are you fixing your GT yourself? What have you tried so far?
Customer: bypassing the supercharger compressor valve
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 months ago.
Category: Ford
Expert:  Gary replied 11 months ago.

Hi there,

I see you have not been attended to as yet, apologies from justanswer.

Did you have the PCM reflashed after the supercharger installation?


Customer: replied 10 months ago.
which came with the kit
Expert:  Gary replied 10 months ago.

How many miles on this engine now?

Did you look at your intake valves during the manifold swap?

Did they look clean or carboned up?

If the engine is healthy, then you need to talk to the supplier.

It may need to go onto a dyno, for remapping while observing A/F ratio data.