Bad mfi relay symptoms. Then I got to thinking fuel pump relay, but after a little more research I found that it was one in the same with the MFI relay and this doesn't sound like the symptoms of a bad MFI relay. This blog will show you how to tell if a relay is bad in a car, truck, or SUV. Apr 17, 2012 · SaveShare Like logitech80 Discussion starter 1059 posts · Joined 2008 #3 ·Apr 18, 2012 If it leans out that means bad mfi relay SaveShare Like 0Reply desiromeo812 478 posts · Joined 2011 #4 ·Apr 18, 2012 Jan 22, 2025 · Conclusion Understanding how to identify a bad electrical relay is essential for maintaining the reliability of your electrical systems. The main relay is a critical component in a vehicle's electrical system, responsible for controlling the flow of power to various electrical components. It can also result in a stalling engine while driving, or warning lights on your dashboard. #1. Learn about them here. By recognizing the symptoms of relay failure and employing effective testing methods, you can diagnose issues accurately and take corrective action. The power transistor and coils measure OK. May 23, 2025 · Symptoms Of A Bad Main Relay The most common symptom of a bad main relay is that you won’t be able to start your car, and nothing may happen when you turn the key. Dec 6, 2007 · On my 98 GST, are both the MFI relay and Fuel Pump Relay right next to each other and look exactly alike (a black box/relay, that has four flat prongs). The ECU works in another car. Typically, the "black" relay is bad and should be replaced with the updated blue relay. Not sure if it was because the number was too long Aug 6, 2009 · My car turns over but won't start. A couple of days later he came to my place and we swapped the high beam lamp relay (blue trace in the picture) with the fuel pump relay; the high beam lamp relay being the same type as that of the fuel pump. Is this what happens when the stock black fuel relay fuse malfunctions? anyone have this issue and know how it feels? I've been Jun 24, 2004 · I checked some grounds and the mpi fuse spot has no ground with the key on. I would expect MFI or your FP control relay contacts opening and closing (clicking) would create obvious symptoms while driving. . Is there a way to test this relay to see if it is the problem? Mike Jul 28, 2014 · I have about 2000 miles on my 2014 evo x, and at wide open throttle, I would feel loss of power from 6000rpm upwards, then hesitation/cough at 7000rpm-7500rpm. When the main relay fails, it can cause a range of issues that can impact the vehicle's performance and functionality. Unable to Start Your Vehicle May 22, 2025 · A failing main relay can cause a lot of problematic symptoms for your vehicle’s fuel system and computer. In this article, we'll explore the common symptoms of a bad main relay and what they mean for your vehicle. A faulty fuel pump relay is one of the many causes of fuel supply problems. The number on both of them was E8T101 7823That's exactly how it was written on the parts. The fuel pump relay is the one with two black/white striped wires in it. Jun 11, 2007 · I know a lot of guys are trying to find the MFI/MPI relay, here's where it is and what it looks like on a 95 GSX. When the fuel pump relay goes out, the fuel pump will struggle to enter high-voltage mode. Find out the crucial signs of a failing main relay that could leave you stranded—don't ignore these warning signals! Apr 29, 2022 · Electrical relay switches in a vehicle play a vital role to make sure certain circuits and units do not get overloaded. The symptoms are usually random and inconsistent, so I personally believe that a wideband AFR is the best long-term solution. The relay is located in the engine bay fuse box as seen below. The most common symptom of a bad relay is the car running lean. Maybe check AEM settings for those solenoids. would this be because of a faulty mfi relay or would the ecu be responsible for this? Apr 9, 2019 · The fuel pump relay on the 2008+ Evolution X is a common trouble area. So, I'm stumped and I have class first thing in the morning, any suggestions? Aug 13, 2009 · So he determined that it was a faulty fuel pump relay. Below, I’ve highlighted a more detailed list of the signs of a bad or failing main relay to look for. No spark. Therefore, it is the best that you change the fuel pump relay periodically. The MFI Fuel Engine Control Relay makes a buzzing sound when the ignition is on. The answers of Experts will help you to determine if you have Mitsubishi fuel pump relay problems. He then turned the high beams on with the fuel pump relay in place. Apr 19, 2017 · However, even these relays last only about a year or so. The part number from Mitsubishi is 8627A024. May 12, 2023 · The ECU controls the solenoids using pulse modulation/duty cycle variation which is why they rapidly click on/off. Jun 23, 2010 · But now same deal, starts for 5 mins then dies and doesn't usually start back up. The other one is the MFI relay. v7wuai y1am pxlwpqbm egk lel ygp 3gyenu kdj7 digr ljg1d