So yeah yesterday and the day before im driving along and i do a 3rd and 4th gear pull. At around 5.5k in 4th the car mis fires and i have no ****ing clue why.

Yesterday it misfired twice in 3rd and 3 times in 4th all in the same pull. The car has been consuming some coolant for a while but it hasnt been consistant. The Day before yesterday it was completely dry at the shop so i filled it up. Got home it was down quite a bit. I filled it at the gas station drove a mile to home where i parked it, checked and it was filled to the top. Most likey it was over flowing out of the top of the reservoir. I checked it again today and it was past full. Are there any other reasons why it could do this?

There is no smoke, rust on the plugs, no nothing. The car runs fine without any problems except its eating coolant.

I took it to mitsubishi today and he checked for any leaks and there was nothing. Pressure check showed no leaks but it did loose a little pressure. When he started it up no smoke came out of the tail pipe afterwards. They are going to call mitsubishi and see what they think. If its a head gasket, theyll replace the headgasket under warranty.

Im supposed to watch it and and monitor the consumption. Im gonna look at the level when its cool, go beat the **** outta it and then let it cool down again to see the level.

Theres nothing in the oil and no smell. Temp stays solid

 

check the oil, if you are getting coolant into the chamber or the oil, the oil will turn milky to yellow. did they tell you what code numbers the ecu threw? if it is a p0300-p0304 they have a reflash to fix it

 

no oil in the coolant

 

Stock head bolts? What PSI you running?

Different radiator cap on there?

Anything upgraded, modified with the fans/radiator/hoses?

Kinda need the whole story in order to help you.

If the coolant system gets too hot it will puke out coolant, as well as if the Rad Cap is different. Coolant temp sensor could have died not allowing the fans to operate. Check to see if they come on at all.

 

Chris -- sorry to hear you are having those problems man. Chris aren't you running the 272's in your car?

 

Does your temp guage rise?

 

I've been datalogging the last few days with stock parts on the car to get a baseline of the car's performance from the factory. After trying a few minor tweaks to the AFC I noticed that there seems to be a lean spot between 4800 and 5500 that knock likes to rear it's ugly head, so your misfires around that RPM don't suprise me. This weekend I'll be bolting on Buschur Stage 2 and we'll see how tuning goes in that RPM range. As far as your issues it could be you are too lean in just that RPM range and getting some knock. If that's the case and your boost is over 20 psi you could have lifted your head and stretched the stock head bolts over time. This happened to me after running my Eclipse hard at Watkins Glen. Normal driving was no problem so initially it was hard to pin down, but long trips or higher boost would push coolant and form tiny leaks throughout the headgasket. If I did a pressure test after it cooled down even a few minutes, no leaks would be found. Without more info such as boost and mods you run for fuel control I am just guessing here, could be something minor or your ECU just needs a reflash.

 

yeah im on the stock head bolts and i just got a race gas tune. When it starte doing this i was boosting to about 23 psi on race gas and when i got the tune i turned it up to 25 tapering down to 19 at redline. ( yes yes i know thats high)

to tell you the truth i really dont care if its blown or not. I just i wanna know what the hell is going on because car is running strong with no rust on the plugs and no smoke. I kinda wish it was blown so i would know what it is. id hate to replace all of that crap and spend the money to find out something else is wrong.

the temp guage doesnt rise at all.

i think that it may be the head is lifting when its in high boost. but im not seeing any smoke at all.

everything is stock with the cooling system...even the cap

 

with the misfiring i think that i may be blowing out my sparks or the car is knocking. It is only doing it when its hot outside so it may be knocking. when it got colder it stopped. Im gonna get some colder plugs tomorrow and throw the race map back in it. but then again, i still have 30k on these stock plugs

it didnt burn any yesterday but i put the race gas map back in it today, turned the boost up to 24 and it ate it. at 21 psi it doesnt burn a drop

i dont think that ignition issue and coolant issue are related the

 

damn
your evo is f_ck_d

 

right

 

HHmmm, with as much coolant that you are loosing you should be able to smell it or atleast see something. I would check the following things:

1. Coolant hoses and radiator
2. Thermostat housing
3. Turbo coolant lines
4. Water pump (leave the car off for 2 hours or so and look right underneath
the timing belt side, if the water pump is bad, you will see coolant right
below that area)
5. Check your heater core and hoses
(If the heater core is leaking you can smell coolant inside the car)
6. Check coolant lines that go to the throttle body
7. Check really carefully with a good light between the head and the block to
see if ther is any signs of coolant.

Also, while under high boost check your coolant level before you do a run and then check it again after you are done, verify it is just under high boost or low boost. Also while under boost, check your review mirrors to see if you are putting out white smoke. See if you can do a compression test too, this will tell you if your head gasket is giving out. Hope this helps.

 

no that im thinking about it, it only does it this when i am running higher boost (duh) because it stopped doing it and started again when i got the tune done. Oh well, i would still like to know why there arent any other signs of coolant entering the cylinders.

 

I see, so atleast you determined that it does it just under high load. I am wondering if under high boost the stock head bolts are giving way, letting the coolant escape out. But even this would leave some type of residue or coolant smell. You should try doing a run and pullin over right after and checking out then to see if there is anything of the obvious.

 

What you can also do is get some time on the dyno and do some high boost runs, I am sure you'll definitely find your culprit that way!! Just make sure you have extra coolant bottles with you