Spunkysandoval

iTrader: (7)

Hi all,

Just wanted to share with everyone here my little experience today.

my fuel pressure regulator vacum line came of of the intake manifold today, and this caused my car to run very poor under WOT and high load conditions.

I'm not exactly sure why it came off other than the high ambient temps and the poor design on the intake manifold FPR hose nipple. The nipple is just a smooth pipe and it allows the hose to slide right off under boost.

If your car is running like poop and looses power under load and WOT, check your fpr regulator vacum hose

EDIT:

I was looking through the general forum and found this member also experienced the same problem. Mitsu shure does know how to make a great car a real POS with stupid little design flaws like this and the fuel pump relay that is inevatibly going to fail on every evo X at around 2X,xxx miles. Mine failed some where in there : mitsu

thread is here

https://www.evolutionm.net/forums/ev...d-my-idle.html

anyone else who has experienced this problem please chime in here

OMEGA BLACK 79

Thank you for the heads up! I will be keeping an eye on it. Actually, I'll just go ahead and secure it some how. Zip tie maybe.

flyguycfi

iTrader: (4)

Why don't you just add a zip tie and stop whining about a simple vacuum line? This certainly isn't the catastrophic design flaw you imply.

tephra

iTrader: (6)

^ it is a design floor... and it can have catastrophic consequences.

maybe thats why these babies are so rich from the factory

Hiboost

iTrader: (9)

The more I think about it, the more I'm going to put a small hose clamp on that connection. It might be on there ok now but if I break the seal and the hose has less friction, any amount of higher boost could send it flying off and really cause issues for your motor depending on how fast you catch it. Thankfully I have a wideband and knocklite on my steering column so that I have some indication something went wrong.

tephra

iTrader: (6)

yeh just ziptie it...

DarwinX

iTrader: (12)

Why didn't Mitsubishi do this on the assembly line? Did the Mitsubishi engineers not know that this line would see pressure, and the poor way in which they secured it to the intake manifold?

EvoX_SA

iTrader: (2)

Mine and another guy from San Antonio had the same problem. JMS saw this and fixed it for me and I took it to the dealership and they replaced it and said it seems to be a common problem.

SilverEvoX

iTrader: (2)

It typically is only blowing off on higher than stock boosted vehicles, mine blew off and I went to mitsu after noticed my AFR's going crazy lean, they got me a better looking and tighter fitting hose that is doing just fine now without any hassle. You can zip tie the stocker also but don't try to use more than one or two because I tried 3 and it was barely above the nipple so when I tightened it I tore the stock FPR hose and needed that new one.

Bhsj13

revived LOL!!! yesterday i ran WOT 4th gear,BANG!! though i def broke something. changed plugs and today did the same thing. i looked closer under the hood and found the FPR hose was off. this probably caused a super lean condition under high load/boost causing the loud bang. luckily i didnt blow anything. zip tied it and now it's fine.

RazorLab

iTrader: (8)

You really had to bump a eight year old thread to say that?

Bhsj13

yes sir!! lol

4b11slayer

Thats why any evo thats modded should have a afr guage

LetsGetThisDone

iTrader: (1)

Popping the reference line off instantly leans the car out to like zero fuel. It doesn't even really hurt the motor. There's so little fuel there's not even enough combustion to make heat to hurt parts.

six40

If I had a wideband I would've more than likely still been on my factory engine. I blew mine due to my own ignorance - but it could've been saved. Needless to say, a wideband was wired in, mounted and fully functional before the car ran again