The Central Hub for DSM Community and Information

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. This is where the DSM platform history is documented and archived. Log in to help us in our mission, and to remove most ads from the browsing experience.

horrible idle, I know why, I think...help

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

tstkl

20+ Year Contributor
3,889
74
Feb 10, 2005
SoCal, California
ok, so I just installed the following: dejon tools: 3 inch exhaust, sheet metal intake manifold, upper intercooler piping, lower intercooler piping, intake pipe, j pipe, and the following non dejon parts. gm maf, maft, k&n air filter, johnny race car rear facing outlets 8 inch fmic.

some background info: ive had every problem you could imagine with the smim, but the one im working on right now is the, "demon bolt". the center bolt between runner 2 and 3 was stripped, and when i went to the dealer to get a replacement since it caused a leak (i think) they gave me two that would "work" after installing one of them, the head of the bolt broke off. looking at the second bolt lead me to realise they gave me a 8x30 bolt rather than a 8x28 bolt. this means the bolt was 2mm too long and caused it to bottom out and break the head off. the stock metal gaskets made it leak a lot. i went to napa and bought a paper gasket with silicon lining around it. i have now installed that, and the following story is the problems i am currently having. also keep in mind that installing a gm maf at 450cc injectors when you have stock, 450cc injectors causes your car to run extremely lean. right now i have it set to 8 or 9, which is somewhere above 500cc.

just installed a silicon lined paper gasket for the intake manifold, used all the bolts except the demon bolt. started the car,... no go. ok it did this before when there was a leak, lets try again with my foot to the floor. there we go, now lets just keep it, ahhhh.... the tach kept dropping too fast for my likings and i gave it gas again and again. didnt look to good. i turned her off and got out (never tried to let it idle as i just assumed it wouldnt. look whos the ass now) my new dejon exhaust was smoking. looking at the log, i noticed its still running lean, no surprise. added a few clicks to see what it would do and tried again. this time i just started with the clutch and gas in. this happened a few more times, me being an idiot and not seeing if it would idle or not and adding fuel due to the decreasing smoke coming out of my exhaust. got some pics with my cell but i dunno how to put them on my computer since i dont have bluetooth. finally i called paul and asked him what i should do next. he suggested trying brake cleaner since he doesnt see how it could possibly be running at -10 hg/in at around idle. (thats what it was and still is running at. btw in addition to adding fuel, i was also tightening the bolts a little each time, dont want any new demon bolts, but was hoping that would work.)

tried the brake cleaner and guess what? a few times it would go up like 50-100 rpms. most of the time it did nothing. thats with me spraying in the same spot. so i follow pauls advice and check the manifold. apparently when he bought a smim one of the welds was cracked and they had to get it rewelded. interesting side note, i can hear a HUGE leak, but cant tell where its coming from, THANKS TO MY LOUD AS HELL DEJON EXHAUST. so i get my pocketlogger and put it on the wind sheild, as far as it can go. then i start spraying. the o2 reading is at .01. the rpm is at about 750-900, up and down. i start spraying. every time i spray by the demon bolt, guess what happens. the rpms stay the same (well they change a little, but they do even if i dont spray, its a negligable amount.) but the o2 climbs. whaaa?!??!?!?!?! maybe it is the demon bolt.... maybe its not? she idles at -10 hg/in.... should i try and drive her the 30ish miles to paul to let him fix it? i want to, but im scared. anyone who lives in the east bay want to follow me so i dont have to worry so much. preferably with a truck of some kind and a tow hitch. maybe even a trailer....
 
took the car to paul today and did a boost leak test. apparently i didnt bolt the jpipe on more than hand tight, my bad, thats not what was causing the problems though. theres a huge leak right by the demon bolt. hes going to take the manifold off and get the bolt out. expected return date is monday. then i can start tuning, put this vr4 pump in there, and see what i can run. im hoping that race gas and 22psi will put me into the 12's, but well see when the day comes. I doubt ill have good shifts since i havent driven the car since august. (today i drove it very cautiously...) the jpipe gasket was blown, thats funny. with that leak gone(the bolt) i should be good to go hopefully.
 
Add Value - Be Respectful - No Trolling - No Misinformation - Participate Often!
Support Vendors who Support the DSM Community

Build Thread Updates

Latest Classifieds

Back
Top