240_to_miata

iTrader: (2)

I am getting major signal interference due to either my megasquirt or walbro fuel pump. It is mostly the higher FM radio stations (104.1, 105.5, 107.7 ect). They will come in perfectly clear with ACC on. when i turn the car to on (engine running or not) i completely loose the radio stations.

I have a pioneer head unit grounded to the metal frame, OEM antena, MS1, walbro 190hp.

Any help would be great, I just noticed this today and with my commute next year i want some free tunes!

BenR

iTrader: (2)

What spark plug wires?

Prospero

Do you have the issue when you prime the fuel pump with the motor off?

240_to_miata

iTrader: (2)

random NGK's that came with the car... but it doesnt matter, it happens even with the key to ON and the engine not running.

240_to_miata

iTrader: (2)

Yes, but its hard to tell if its the MS or fuel pump because they both power up. Ill try disconnecting my MS and turning it to on. the factory ecu will still turn the fuel pump on. I run in parallel.

fmowry

iTrader: (8)

When you say grounded to the metal frame, do you mean the frame that houses the radio, or the car frame? The housing for the radio isn't a very good ground. Ground the radio to to the body. Clean the paint off in that spot and use a good ground.

Frank

240_to_miata

iTrader: (2)

Its actually a ghetto *** ground to a bolt by the shifter. U think a good ground will help a lot? Im moving the radio to the lower DIN and installing gauges above it this weekend, ill get a good ground then.

Prospero

Try to get a ground wire from as close to the PPF as you can get. When you hook up the gauges you can always share a 10ga ground from near the power plant frame with the gauges and stereo. The only consideration is when using electronic gauges, be sure to ground them all to the same place. Otherwise you could get problems.

Cheers,
Prospero