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Hi everybody
I own 94 TA LT1 4l60e and 2.72 gears
It is stock with some mods for now
-rebuild tranny with corvette oil pump, z-pack and rougher/faster shifting
-trans oil cooler
-engine oil cooler
- 94 vented opti
-k&n air filter
-cat delete
-TB coolant bypass
-intake elbow silencer delete
-oil temp / fuel press / vacuum - gages
-160 t-stat
-fan switch
I want to tune it.
Let's get started
Factory bin file attached
You should probably start by stating what problems you’re actually having so that they can be addressed before wasting time tuning.
Well
I was cruising and got a SES light with code 44. Left bank lean condition. I had it earlier but i found a problem with HVAC vacuum leak. I fixed it, cleared the DTC.
Today after all I checked the engine for leakes with smoke machine and found one in optispark. I moded 94 non-vented opti to vented earlier as you can see above. I converted it back to non-vented and checked everything again. No leaks. Done.
But I watch throug the Eehack logs and I dont know if theese are normal parameters: (there is no much differences before and after vacuum fix in logs BTW )
MAF is 7.5 g/s at idle
IAC position sometimes 6 to 9 at idle
BLM is on
Also maybe smth is wrong
Here are logs
So, can anybody take a look? Or I need some logs from good working stock car. I will compare.
i haven't looked at your logs, but with the maf and iac so low you probably have another vacuum leak or unmetered air somewhere. the maf isn't reading much airflow, but the IAC is trying to lower your RPM. it's a very old car so anything rubber or plastic is suspect but also things like your 'intake elbow silencer delete' need to be rechecked.
New logs. I drove a car all day on my business.
What I found
Sometimes LBLM and RBLM drops less than 110
AVGBLM too
Generally on deacceleration but not always
Checked, for vacuum leaks again. I have no leaks. I'm using smoke machine and I believe i would see if smoke came from somewhere.
The only thing I havent checked is brake booster. I'll check it later, but brakes seems to be okay.
I can attach those logs if needed
i know from experience that if your brake booster leaks on an fbody, your brakes barely work at all.. but definitely do check it.
Most likely the booster will be ok.
Idle is 900-1200
replaced the iac with used one
then it rised to 2000
used scan 94 95 to reset iac position
after clicking on that button about 5 or more times it has dropped to normal idle and IAC was about 10-14 steps
after restarting the car rpm is about 750-800
but target rpm is 650
IAC is about 20-25
Faulty IAC?
your TPS is at 1%.... why is your TPS at 1%? it wont try to attain your idle target if the TPS is open.
Good question. I'll try eehach to measure tps. Scan 94 95 always shows 1%
One more moment. The only leak i have is on the pic below. And I can do nothing with it. TB shaft.
its normal for it to leak a bit there. it looks like you haven't adjusted your idle screw. make sure your throttle plates are closed as much as possible (just not so much that they jam in the bore). after doing all this, pull your PCM BAT fuse for a bit just to make sure ecm memory is clear.
Now tps is 0. Strange. I did nothing about adjusting that screw. Rmp just raised and thats it. 700. Then 800 in a week. Then 900 and so on
Idle iac is 40 steps. Is it okay?
Idle is 850.
I'll try to install new tps. I dont like how it operates
Faulty tps.
Fixed.
Today was a next step with my pontiac
I made mods with ECM.
Installed EEPROM sockets for both sides. I want to say that there is no need in installing credit card pices. And no need to cut the bottom in a socket.
All you need is heated table and heatgun.
If you dont have a heated table you just can use household iron and a paper towel as a spacer.
Everything works perfect.
then I made some "cosmetic" mods:
1. Cat potection disable. I have cat delete.
2. Lowered the overheat enrichment protection
3. Lowered BLM Hysteresis for more accurate idle
4. AC clutch disable within lower TPS
5. Disabled AIR PUMP - DOESNT WORK!!! AIR pump still engages on start. And I see in logs. How to finally disable it?
6.Lower TEMP fans kicking.
7.Lowered IDLE to 500. Works perfect.