Stock Tune...Lean AFR (Fuel pump relay failure could damage your engine!)
Was just on Mitsubishiparts.net looking for a fuel pump relay, had no luck is the relay just a non specific relay or is it only for the fuel pump? Chris (AMS) said he switched relays with the DRL so Im assuming any relay will work...
no prob!
I wonder how do you make an issue a TSB? File a petition to mitsu? I think there has to be numerous complaints/incidents before they look into this....
Try to yank it out. It might just pop out from its harness. Idk, I'm at work right now so I really cant verify.
Try to yank it out. It might just pop out from its harness. Idk, I'm at work right now so I really cant verify.
nj posted about this earlier this month:
https://www.evolutionm.net/forums/ev...-lean-afr.html
Here is a easier to read diagram:
https://www.evolutionm.net/forums/ev...-lean-afr.html
Here is a easier to read diagram:
Today spunky and I logged an tuned his car. He nailed it. It was the bloody relay. The moment we swapped the relay, the car became pig rich during WOT. This is the first time that I was happy to see an Evo X running pig rich 
There should be a sticky made with a WARNING in the title about this. This is a very serious problem for the Evo X that owners MUST be made aware of. This might lead, if it has not done so already, to a lot of blown engine.
I am very proud of Spunky. He took the bull by the horns and figured it out. I love people like that
There should be a sticky made with a WARNING in the title about this. This is a very serious problem for the Evo X that owners MUST be made aware of. This might lead, if it has not done so already, to a lot of blown engine.
I am very proud of Spunky. He took the bull by the horns and figured it out. I love people like that
Great work you guys. I will stick it and title it whatever you'd like.
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Joined: Jun 2009
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From: CA
So it sounds like Mitsubishi tried to save on warranty claims for the fuel pump and as a result possibly losing engines to it.
In the DSM world, we'd rewire the fuel pump using the original relay as the trigger. Perhaps this is what needs to be done here? No actual wiring, but rewire the output of the low and high to a separate relay that will just turn on the pump at full voltage regardless. But if the relay fails, does that mean the fuel pump will keep running even when the car is off? Or it'll pop off when the key is in the off position.
In the DSM world, we'd rewire the fuel pump using the original relay as the trigger. Perhaps this is what needs to be done here? No actual wiring, but rewire the output of the low and high to a separate relay that will just turn on the pump at full voltage regardless. But if the relay fails, does that mean the fuel pump will keep running even when the car is off? Or it'll pop off when the key is in the off position.
Last edited by rcboosted; Aug 25, 2009 at 05:49 PM.
