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Blue relay buzzing - 2001 Isuzu Trooper

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Buzzing sound coming from under the back end


Under the left side of your back seat is a fuse / relay box . When you first turn the key on the fuel pump relay turns on for a few seconds to prime the fuel system . That relay is in that fuse / relay box ,that is what your hearing . Does the vehicle start an run good , no problems other then the buzzing sound .The vehicle battery is also under the rear seat on the right side . How To Locate and disconnect Battery Buick Lesabre Pontiac Bonneville 00...

Feb 19, 2016 | 2002 Buick LeSabre Custom

1 Answer

96 windstar eec wiring scematic


Find another relay with an identical part number(maybe the fuel pump relay)& swap it in place of the suspect EEC relay.See if the buzzing quits.If it does,the EEC relay is bad.There might be a ac WOT cutout relay or fan relay with an identical part number that you can use instead of the fuel pump relay.The fuel pump relay & EEC relay will both have to be in place in order for the engine to start.A relay should click when you turn the key on,but it shouldn't make a buzzing noise.BTW-the EEC relay is energized when you turn the key on and then it supplies ignition on power to the computer,injectors,solenoids and fuel pump relay.Therefore, if the EEC relay is defective, these components are Not going to work.If you don't hear the fuel pump prime when the key is first turned on,that's a sign the EEC relay is bad.One of the injector wires should have battery voltage, if the EEC relay is powering up.If your vehicle doesn't have a matching relay to the EEC relay(except for the fuel pump relay)just pull the FP relay out and slide it into place of the suspect EEC relay for testing purposes.If the buzzing noise stops,then replace the relay because there's no way to test if the car will start without having both relays in place.

Oct 11, 2015 | 1996 Ford Windstar

1 Answer

Why does main relay buzz and gets no fuel?


the relay buzz indicates the contacts in the relay can`t make the proper contact to stay closed there for vibrate causing the buzz noise you hear. this is causing no fuel so you should check to see what is causing the relay not to close, such as too much draw in the system or weak voltage to the relay.

Aug 25, 2014 | Cars & Trucks

2 Answers

Relay makes buzzing noies


This is usually a sign that the contact points in the Relay are bad and the Relay needs replacement. Another problem can be the wiring to the Relay no longer connects a terminal to the Relay. The Relay would not lock or stay engaged and the Coil inside the Relay would buzz because it can not connect and engage the magnets inside the Relay coil.

Mar 02, 2013 | 1997 Ford F150 Regular Cab

2 Answers

Fuel relay buzzing, no start


I'm having the same problem. What did it end up being?

Feb 14, 2010 | 2004 Pontiac Sunfire

1 Answer

Relay for turn signal buzzes when turned on


The only reason that a relay buzzes is it is getting either a poor ground or a lack of power,clean your body grounding points and make sure you have a full 12v supply to the relay.If you have low voltage to the relay check the fuse and clean off any corrosion,if not that replace the turn signal switch./

Dec 05, 2009 | 1995 Nissan Pathfinder

1 Answer

My 2003 expedition will not start only loud buzzing noise from the fuze box.


try changing the ignition relay,or put your finger on each relay while the buzzing is going on,and find the one that is vibrating most ie..(buzzing!!!)

Oct 26, 2009 | 2003 Ford Expedition

3 Answers

It want start


Double check your connections and replace the fuse. That sound usually indicates there is a short.

Aug 27, 2009 | 2000 Jeep Grand Cherokee

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