spoolin2bars

iTrader: (1)

let me just say first that the car has ran great for the last 2 years since buying it from my buddy. he had it tuned at FM during one of their annual gatherings. anyways, last week i drove home from work as usual. when i tried to leave later that night my car wouldn't start. long story short, it was a sensor ground that was hardened from heat and broke off the connector. apparently when this happens, the link opens the injectors wide open till the chambers are full. fixed the ground and the car started and ran again. ran like **** obviously, figured it would burn off the extra gas and oil that were in the chambers and run better and it did. problem now is that it stumbles and stalls. sometimes it will idle perfect for minutes and then out of nowhere just stall! also when driving, it will be running normal and then it will stumble 1 ot 2 times every few minutes. can't get into boost because it cuts out. (not like a hard boost cut type feeling, more like a fuel cut type of stumble) i put a wideband on today and when it stumbles it goes lean. i assume it's fuel delivery and not ignition because it goes lean and not rich. i imagine if it went rich for a sec. when it stumbles it would mean the injector fired but the spark didn't and vise versa.
i've checked the injector clips and harness, replaced some nasty hard vac lines that went from the intake to fpr to fpr solenoid. checked the wiring and vac line to the link map sensor. (blk. box) i thought maybe the o2 could be bad at first, but it seems to be reading ok on the link keypad. only when it stumbles does it jump around. also, it seems to be fine during cold startup, but once it warms up a little and the idle comes down, it starts to stumble and drive shitty.
one thing i did before i found out about the link making the injectors stay open due to the gound deal was i took the injectors to a local shop and had them cleaned and tested. they said they seem to work fine and leakdown tested them under pressure and they were good.
my trackday event is coming up soon and i've run out of ideas. please, if anyone has experience with link ecu and can proivide some feedback, lmk. thanks in advance.

m2cupcar

iTrader: (5)

So it was perfect until the ground went bad, then you replaced the ground and now it's better but not perfect? I'd recheck your new ground first.

spoolin2bars

iTrader: (1)

cool, i'll double check it. but if it wasn't good, the car would be flooding, like completely filling the combustion chambers. when i fixed that, it started running again. but before i knew that was the problem, i had the injectors cleaned. i also fixed the iat wire that was broken inside the sleeving. i know that's good because the iat reading on the keypad never jumps to 100 intermittently like it used to. the reason these wires had to be fixed is because of the heat in the engine bay. my car has 195,000 miles and over 100,000 of them turbocharged! someone said that if the coolant temp sensor is cutting in/out (like from another heat damaged wire) it could affect the car with these symptoms. is there 2 coolant temp sensors? i guess i can check that next.