Ok not sure if i'm unlucky enough to have 2 separate problems at the same time or if both problems are related.

-My Evo 8 has about 68k on it.....car has light mods.

Just last October my car starting sputtering really hard when im WOT. Thought it would go away but it keeps happening. The wierd part is that when im cruising at high speeds or WOT my coolant temp shoots to HOT instantly, and then drops back down to normal when slowing down.

- I had a greddy profec boost controller in my car, swapped it out for a forge unos....problem still there.

- I had my actuator checked and its working fine, but the little rod sticking out of the actuator is stiff. Is it possible to move that actuator rod with your hand? Or does it need alot of pressure to get it to move.

-A mechanic i went to derived that the problem must be coming from where that rod in the actuator is connected. Against the bottom section of the exhaust manifold.

the car has been running fine for 6 months although the problem still comes up, the car is still drivable. The sputtering feels like a loss of power and the car shutters. Funny thing is that the car does this when its warming up, after a good long WOT pull the problem goes away until the next time i turn on the car and take it out, but the coolant gauge STILL shoots to HOT. This is a very wierd problem i know, but i am trying to pull as many resources as possible to find out what it could be.


- any help or advice from the EvoM community would be greatful.

I love my Evo, dont want it to go anywhere...lol

Thank you

 

i'd be really careful... i had a similar problem with the stutter at WOT... now i have a hole the size of an orange in my block... still unsure of the exact cause in my case... cuz when it blew i was only at about 4k in third not WOT... leaning towards bad tune... or possibly a malfunctioning MBC.... but the new engine starts goin in monday

i never had problems with the coolant temp tho

 

Is it possibly an issue related to knock? Sometimes I have a stuttering problem after a 7k+ shift. It usually occurs after seeing some knock at 6k+ (couple hits).

 

replace your temp sensor

 

Spark blowout, get yourself some new plugs and gap them smaller than where you're currently at. Good Luck

 

Last thing do a boost leak test.

 

The coolant temp thing would worry me the most.

I think it would be wise to check the oil for coolant and visa versa in case you have lifted the head gasket.

 

A Blown Head Gasket will not produce these sort of effects

The car would blow blue smoke out it's tail pipe if he had a blow head gasket.

Check your coolant reservoir, if the fluid is brownish in color and feels oily your HG is leaking.

 

it would be white smoke if its a head gasket this could be signs of a headgasket on its way out though..whats your AFR at WOT?

 

Whitish blue smoke dude, but the HG isn't the issue, I'm just about 100% positive on that.

 

idk about that the temp is going up...seems like a sign to me its hard to pinpoint things on evos it could be a variety of things like the temp sensor and bad sparkplugs causing both you never know

 

Not totally true, I lifted the head and this was the first thing that happened. Temps shot up and lowered almost immediately. Id do a compression test, then check temp sensor.

 

Get a compression check ASAP. before you warp the head.

 

i wouldnt drive it a lot if i were you, get it fixed first,

but i agree with these guys, check your oil and coolant and see if theres mixture
and CHECK PLUGS!

 

check the thermostat maybe "burp" the coolant system to get rid of the temperature issue