Hey guys, Just thought id share my funny experience ive had with my evo today.

For the past 6 months, my evo kept throwing a check engine light error, so obviously i got the code checked. The tuner told me its just a exhaust re-circulation code and not to worry about it, he then cleared the code and all was good....for like 5 minutes. Anyways i just didnt bother worrying about it as i jsut assumed maybe i blew my cat.

In addition to the check engine light, i also had an oil pressure problem on idle, which also started 6 months ago, usually the oil pressure light would flicker and drop to about 5psi of pressure. Keep in mind at this point in time I didnt even think that the exhaust re-circulation and the pressure problem was even remotely related. Anyway, so i obviously got it checked by another tuning shop, he said its most likely worn bearings, so he threw in some thicker oil....which didn't help much except increase the oil temp.

Then just today, i was bored sh**less, so i decided to google "evo exhaust re-circulation", and found on one of these forums that its a common problem for the hose to get disconnected when you increase the boost. So i thought maybe this was my problem, so i ran downstairs and checked out the intake, and what do you know! Found the pipe had been disconnected, so i reconnected and clamped on the hose, cleared all the codes and started up the car....

It ran like bloody new!

Now here is the part that made my day, not only did plugging back this hose fix my CEL, it also fixed my idle, which resulted in no more oil pressure problems! My oil was now at 15psi as oppose to 5 which meant no more oil light flickers. And as a bonus, before i plugged in the hose, my car was pushing 1.3 bar of boost, now its pushing 1.5 bar! Which is funny because i thought my turbo was worn, so i bought a near new evo 9 turbo, which i probably wont be needing for a while now that my turbo actually did have some juice left.

The car now takes off from a stop much better, theres nearly no rough idle, and throttle response is so much better. All from just this one little vacuum hose! I also sprayed some maf sensor cleaner on all the terminals around the EGR.

But yea, so freakin happy! Going to sleep well tonight ;p

 

Exactly which hose was it? It's always nice fixing a problem that cost no money and makes you love the car all over again, I'm usually under the hood everyday checking things over and always zip tie any hose that sees positive pressure.

 

Hey mate,

Its hard to describe but ill give it a shot. Theres 2 hoses that connect to this piece :

http://www.lancerregister.com/attach...1&d=1187001462

It is located right under the intake manifold below the throttle body. You will literally have to put your hand under the intake a feel your way to it.

The bottom link is a blueprint of the rear of the engine, the black arrow points out the EGR solenoid, thats where the hose is.

http://thefrost.net/randomfiles/rand...lenoid_Loc.JPG

 

Thus, the Number# 1 rule of modify/repairing an Evo is ALWAYS DO A LEAK TEST FIRST!

 

No the number one rule is remove EGR and do a block off plate then do a BLT...

 

Haha yessss! Will be doing a proper boost leak test once i upgrade the turbo and tune the car to e85

I wanted to remove the egr, but it required too much effort! I just clamped that silly hose and was done with it. Poor engineering on mitsubishis part, they should of clamped it.

 

I've had my EGR removed for 4 years. Gets rid of a bunch of hoses and about 6-7lbs weight.

 

There is not much work to remove the EGR. Two bolts that hold it to the manifold and put the block off plate in place and then put the two bolts back in along with pulling the hoses off. 5 minutes max.

I wouldn't wait to do a boost leak test.

 

Would this actually cause the oil pressure to be low? 6 months @ 5psi would be sketch.

 

Oh really?? I couldnt even see the valve, i just felt my way through, so assumed i would need to remove the piping and throttle body just to get to it. Is it really beneficial to remove it?

 

Umm yea it caused some erratic idle, so drops around 500-600rpm, as oppose to 800-1000 revs. Currently sitting at 10-15psi. Though even 10 worries me still.