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Resolved HELP ME get my car running right again

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Luke_DSM

Probationary Member
10
1
Sep 12, 2019
Winfield, Alabama
So, i own a 1999 Mitsubishi Eclipse Gst Spyder with these mods done to it:
(I'm just now getting into cars)
Small 16g turbo with install kit

Front mount intercooler

Evo8 560cc injectors

Fuel lab adjustable Fuel pressure regulator

Walbro 255 fuel pump

3 inch turbo back exhaust

Greddy boost controller and turbo timer

Prosport volt, oil pressure, fuel pressure, boost and wide band air fuel gauges.

Evo valve cover.

Injen air intake kit.

Greddy type s blow off valve

Ceddy mods flash tuning software on h8 black box ecu

Taxtrics tuning cable for flat sh tuning




My problem is, yesterday morning my exhaust came unbolted from the engine exit, and was pushing exhaust out of the engine rather than through the system. Since i am in high school, i didn't have time to go to a supply store and buy new bolts and nuts to put it back together, so i waited until after school to go to my house, change clothes the go to the supply store. At the only supply store that was open at the time (5pm) the didn't have the stuff i needed, so i decided to go home and wake up early in the morning to go to a different store. Well on the way back home my car spudered and killed out randomly, so i coasted to a nearby parking lot to see what had happened. I tried to crank it up again, and it cranked, ran for a couple seconds then killed out.

I called my brother, got him to get some bolts and nuts from somewhere (he found a place that was opened) and put the exhaust back on.

Problem solved right? Wrong.

Now when i crank the car it idles normal, but when i touch the gas pedal, it throws my wideband gauge off and makes it go crazy and it kills out.

My theory - Since i drove the car for a little bit without the exhaust passing by the Oxygen Sensor l, the sensor was telling my car that i wasn't pushing out any exhaust, and the car needed more gas in the engine, causing it to flood my engine.

But get this... i left my car overnight to let the engine drain, so when i came back i could crank it and the sensor would see that everything is okay now. When i cranked it up, it idled perfect, until i pressed the gas and it flooded the engine again.

I don't know what to do and this is my daily car to get to school and work so if you can help please do asap. i have the tuning software on a laptop just don't know how to use it.

If you need videos to see what it's doing i will be more than happy to show you.

Thanks!
 

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Exhaust is hot. Was it pushing out around any wiring? Check for any melted wires if it was pushing out around any.
 
Sounds like a boost leak OR the mass air sensor is not reading all of the air entering the engine for some reason,
 
Do you have a cat? Happened to someone I know but his cat was completely clogged causing a restriction. Not saying that’s your issue but worth a shot(that is if you still have a cat on the car). :idontknow::confused:
 
Perhaps you’re right that the o2 was reading lean, therefore causing the car to push a lot more fuel. Just giving you ideas, but check your spark plugs for fouling and like previously stated, check for burnt wires and such. Report back.
 
Mine did this EXACT same thing when I was working on the car and accidentally left the upper intercooler pipe disconnected so the MAF sensor had no idea what was actually entering the engine and same thing, my A/F gauge would go crazy. It would start and idle the same way, but die when I tried to move the car unless I really pushed the accelerator but it ran like crap. Not sure if this helps at all but it seems to be exactly what was happening to me and it was something to do with the MAFS not knowing what is going on.
 
Mine did this EXACT same thing when I was working on the car and accidentally left the upper intercooler pipe disconnected so the MAF sensor had no idea what was actually entering the engine and same thing, my A/F gauge would go crazy. It would start and idle the same way, but die when I tried to move the car unless I really pushed the accelerator but it ran like crap. Not sure if this helps at all but it seems to be exactly what was happening to me and it was something to do with the MAFS not knowing what is going on.
will definitely be checking on that tomorrow
 
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