I am getting no smell, no smoke, nothing funny is happening, no residue that i can see, no rust on plugs, no nothing. Its just whenever i check the coolant is down.

I first noticed this when it started getting warmer out. Naturally i used the A/C and i noticed that i was low on coolant. Didnt think anything about it. It was around there when i started boosting again too. i filled it twice and it stopped doing it. But it also got colder so i stopped using the a/c.

Monday it starts geting warm again so i use the a/c. after the tune was done, the coolant was gone. filled it again and drove home. Drive arouund again tuesday back to the shop and it was low. Filled it and drove back to my town to a gas station, checked and it was low. filled it again and then got to my house to find it was over flowing. wtf?

I then took it to mitsubishi on thursday, checked all over for leaks, did a collant pressure test, everything checked out fine. he filled it up and told me to monitor it. Go home, let it cool and look that the level. Then go out and beat the **** out of it, let it cool and check again. I did this and it was fine at the same level. ( pump gas) Also it was cold so there was no a/c

Today, because it didnt burn an yesterday, i put the race gas map back in along with race gas to see if it would burn again because it didnt burn any yesterday. Today it was hot so used the a/c and it burned. Boost reached 24 psi max today.

So there are only a couple things that could be happening.
- I have a partially blown headgasket that leaks at higher than normal boost ( but keep in mind there are no other signs)
- Something tied into the a/c that is causing coolant to leak and or burn.
- i have a leak somewhere in the coolant system
- i may have a bubble in the coolant system somewhere (idea from a friend)

So tomorrow i am going to check my a/c theory and just run the a/c at normal boost to see what i get. Then it will be running race gas again on pump psi levels and then running it on high psi to see what happens. After that, drain my coolant system and see if i can get rid of a bubble that may be in there.

:-(

 

My brother has said that he has never seen any smoke come out except black carbon which is normal. Never had any droplets spray on his windshield nor has it smelled funny at all. The pattern obviously shows a blown headgasket but there are not any other signs that would show it.

It would be nice to get it on a dyno but there isnt one close by.

 

Hmm, ok, sounds like you've done all the right things in troubleshooting the issue. I can see how its driving you nuts. Since the dyno is out of question, the best thing to do is to do a cylinder leak down test. You can pick one up from your local autoparts store and the test is really easy. They usually run between 25 to 70 bucks or so. The steps are basically removing one spark plug at a time, hooking up the compression tester and cranking the car for about 5 seconds or until the needle stops at a certain reading. You should see readings of 175 if I am recalling this correctly, I'll double check though.

 

done it and it was 180 across
That was a couple weeks ago when i first noticed the problem

Ill do another one tomorrow

 

Ok, now you got me wondering what it could be, LOL. Let me ponder on this one some more and see if I can come up some more ideas.

 

lol
aint this some ****?

Im going to bed

 

hmm i dont think the a/c would have anything to do with it... first thing i thought of after reading your responses is that warmer intake charge is causing excessive knock

has this mostly happened (or been the worst) on the hotter days (and not happened when its colder)? a relatively small change in ambient temperature can cause bigger changes in actual intake air temperatures because of the intercooler losing efficiency and whatnot... i think you should try to avoid situations that would cause the knock/misfire until you get something to monitor the knock sensor so you can be sure your engine isnt going to grenade :/

has it thrown any CELs?

 

Haha, we'll figure it out . I concur with the "I am going to bed" statement!!

 

From what I am reading here I think you have stretched the stock head bolts. Higher load and boost is lifting the head and sending minor leaks into your combustion chambers. Think if it as a free water injection system, and because it must be several smaller leaks that only occur under higher load and boost you aren't seeing any sign of the coolant burning in the combustion chambers.

Just get ARP headstuds and a new head gasket in there and I bet you will be fine. The AC being on during hot weather is just additional stress on the stock cooling system especially when it starts running low on fluid and air pockets are created. This is exactly what I want to avoid on the Evo this time around and you can bet I am replacing the stock headbolts before it happens! My Eclipse ran like that for over a year and had the same exact symptoms you are describing here. Doing a compression test once you pull over would never show a problem but I bet a leakdown test over time would possibly show up. The problem is it usually only leaks under high load or boost so unless you can test the compression under those conditions it will continue to be elusive. Have them test for exhaust gasses in your coolant as that is one of the few ways to confirm all of this.