Ok guys i need your expertise again. My RA is tuned for 94 oct fuel and this past weekend i was driving home from a road trip and i could only find 91 oct and my laptop crashed so i couldnt load up a different map. So i put in just enough 91 to get me home and then i filled up with 94. Now the problem is when i go WOT my AFR's are 13.5 to 14 so of coarse im not going into boost till i can get this figured out. Im wondering if my tune is out of wack or maybe my 02 sensor is fried.

 

It won't have anything to do with your putting in different fuel.


Check the two most infamous possibilities:

1. Fuel Pressure Regulator hose popped off.
2. Fuel Pump "high voltage mode" Relay is dead.

Rich

 

thanks Rich. I dont have a service manual so is the relay circled above the fuel pump relay?

 

You'll need to do a search, I'm afraid. I'm overseas on business right now, and my memory isn't that good, lol.

Rich

 

Haha thanks for the honesty. Well i figured it out and did a relay test i found on here and it was bad. Swapped it out and now my afrs are back down to around 11.5 at WOT. Thanks again

 

So stupid that a $15 part can risk the integrity of an expensive engine!

Bad design. No sensor double-check, no CEL, no "always-high-voltage" fail-safe...

Rich

 

Here's a little note for anyone without a wideband...

Get one.



Rich

 

got A link?

 

You want the MOON on a STICK, you do.

https://www.evolutionm.net/forums/ev...open-pics.html

https://www.evolutionm.net/forums/ev...-page-4-a.html

http://www.evoxforums.com/forums/showthread.php?t=17957

If there are more, feel free to post 'em up. I'm sure there was at least one other good one around... but I can't seem to find it.

Rich

 

so after reading those articles, paying closer attention to my A/F guage, and checking my relay which turn out to be a black one and giving it the shake test which it failed i'm pretty sure its been gone for a couple months now that i think about it... so i've swapped it for the highbeam relay till i can get a new one from the dealer

so do i just wonder into my dealer and be like gimme the blue relay cuz mines black?

all the relays with an engine symbol are blue with the except of course the fuel pump relay which is black... the remaining relays are all black... i assume the black fuel pump relay is the only one that should be swaped?

 

when i went into mitsu asking about a blue relay the parts guy just looked at me. Hell i even printed off information off of here to explain and he still didnt know what i was talking about. i think my dealership is full of grade A dipsticks

 

that's about par for the course

 

so i went into my service dept.. told the manager what i needed and why... being an RA owner himself he hooked me up with a blue relay for my fuel pump for nothin

now question is are these relays the up to date replacements?


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