quik95lt1

iTrader: (7)

its absolutly a tune issue.......car ran fine before the install......runs fine until it gets into closed loop........about 85% of mail orders ive seen locally have been FAR too rich at part throttle.....there are many things that can be making the ECM flip out in CL in the tune......use datamaster and log your RPM/LTFT's/STFT's/MAP/TCS/ECT/Fueling Mode and WB02 if you can.....if you dont have one you need to pick one up.....

lt11994

The current problem I'm having is getting datamaster to read my pcm

bloodyslayer42

I have a 1995 z28 Camaro. I picked the car up for a few dollars it was half way done so I finished it. The car has a cc306 can and lots PS bolt one. The car will only run in a open loop. The fans kick on as soon as I start the car. I replaced the coolant temp sensor and the o2s and it is still running a open loop I put the stock Mar back on it and no change. It is burning very rich and back fires between 1 and 2 thousand rpm. Would the can cause these problems because of my factory tune. I also put a new OEM optispark on plugs wires coil and icm. I am waiting for my software to get here so I can data log but any insight would be good thanks.

bloodyslayer42

I have a 1995 z28 Camaro. I picked the car up for a few dollars it was half way done so I finished it. The car has a cc306 can and lots of bolt ons. The car will only run in a open loop. The fans kick on as soon as I start the car. I replaced the coolant temp sensor and the o2s and it is still running a open loop I put the stock Maf back on it and no change. It is burning very rich and back fires between 1 and 2 thousand rpm. Would the cam cause these problems because of my factory tune. I also put a new OEM optispark on plugs wires coil and icm. I am waiting for my software to get here so I can data log but any insight would be good thanks.

lt11994

Maybe someone can help me in terms of giving directions on how to upload a datalog? I have one of the car acting badly in closed loop, however parked in free rev. For now here is a screen shot of Datamaster,



I think there is definitely a knock count issue, lol and that is obviously retarding spark. My question is what is causing all this false knock? Valvetrain noise, maybe? If anyone can provide a way to upload this file let me know I'd love to get this figured out.

lt11994

Anybody? Pretty sure I need an lt4 knock module and that'll fix my problem

gregrob

iTrader: (8)

You can email me your tune and I can play with it. You most likely will not need an LT1 knock module

FAD2BLK93

If its only doing it in closed loop wouldn't it be a sensor issue? Since the computer reads them all.just throwing it out there. Have u tried unplugging an o2 to keep it in open loop? How did that work out? Run any different?

lt11994

No I havent only because it definitely runs much better while its in open loop. This is the only thing that is obvious to me as of now, especially after reading about how sensitive these stock knock sensors can be.

lt11994

Ok so I am still having this problem. I adjusted the valves and installed an LT4 knock module. I am still getting a constant knock retard at idle. 4 degrees, and it varies with throttle, only in closed loop. Seems to run ok in open loop however. Where do I go next?

FASTFATBOY

iTrader: (23)

Unless I forgot everythhing, MAP should not read 100 KPA at Idle. Thats a WOT reading. Why does it say 100KPA at the top?

Isnt 57 KPA kinda high for idle?

IAC is also very high.

lt11994

I have no idea why they are that high or where they're supposed to be for that matter

FASTFATBOY

iTrader: (23)

I know 100kpa is a wide open throttle map reading.

IAC at idle should be in the 40's

EDIT

The top Map is atmospheric pressure.

defaultexistence

iTrader: (11)

You also need tO select f-car it's set on y-car in that log...

firehawk238

iTrader: (1)

while running the car untuned you might have fuel soaked your O2 sensors and ruined them. might try replacing them and see what the car does after that.

lt11994

http://www.njfboa.org/WBT/log1.uni
http://www.njfboa.org/WBT/log2.uni
These are 2 logs
I have checked the injector wires and they seem fine. I just did another datalog of the car. I unplugged the temp sensor and the car didnt start so I plugged it back in. I then got code 15 (coolant temp low, expected) and code 16, the code no one ever wants to see.

Heres what I dont understand. 1. I cleared both codes and both went away and didnt come back so was it a hiccup? 2. If this was an Opti problem, why would it only happen in closed loop (literally a night and day difference). 3. Did me unplugging the temp sensor cause the code 16 possibly? 4. If I did have an Opti problem wouldnt the code stay there? I hope you can veiw those logs

lt11994

Anybody want to read these logs for me? Please. I'll pay at this point.

Green3spd

iTrader: (7)

Still sounds like an O2 sensor. When you monitor the O2's, do they SLOWLY drop in count or do they stay at 100+? Expect them to jump,around quite a bit but see if they just steadily drop.

FASTFATBOY

iTrader: (23)

His 02's look fine, I cant figure why his IAC is maxed out. His st/lt fuel is fine. Weird.

96TransAmboosted

iTrader: (8)

Does it have an aftermarket Throttle body