Hi All,
Been lurking for awhile while working on my TBI swap, but I am now to the tuning and could use some help.
The rig is a 1974 Jeep CJ5 that has a Chevy 350 in it mated to a 3 speed manual transmission. I believe it's a T-15.
The block number reads 14010207 which from some research leads me to believe it is a 4 bolt main from an 80-84 C/K Truck.
I did the Junkyard TBI conversion with a 7747 ECU.
Junkyards parts:
Throttle body/Injectors
IAC
TPS
MAP sensor
Wiring Harness
7747 ECU
New Parts:
O2 Sensor (one wire, thinking I should upgrade to the three wire)
Coolant sensor
Knock sensor
Many other parts
I got everything wired and installed. She fires up using a BIN from this website, but doesn't run that well. I can pitter patter around town, but if I try to get up and go, there is no power. Even getting going from a stop takes quite a bit more throttle and a lot more clutch work than I think it should.
I am pretty new to tuning and have been reading up on it on this website and others. I have done some data logging and some of the issues I am having are as follows:
1. Injector Duty Cycle at idle is 400% or more and if I rev the engine it all it shoots way up to 1000% or more.
2. My IAC valve seems to work when I initially start, but then it seems to get stuck at 145. My idle never gets down to the 600 range like I would like. Sits around 800-950.
3. I read somewhere that a stock 350 should have about 17 for Vacuum. Mine sits around 14-15 at idle. I don't think it is cammed.. It doesn't sound cammed. I also can't find any "more" vacuum leaks. I had found a big one when I fired it up originally and revved way too high at idle.
4. I do not have VSS at this time. I might invest in the future, but ideally I want to get this running pretty good and then add it if necessary.
5. I am not certain I am able to get into closed loop because my bung is pretty far down on the exhaust. PO had put the really long exhaust manifolds on. I need to replace them with some that have the bung closer to the engine I think.
The BIN I am using is: 88 ASCN GMC 5.7 Manual - pulled from this site ASCN 88 GMC 5.7 Manual Trans.binASDW 87 R-V Truck 5.7TBI 4 speed manual.bin
UPDATED 4.28.2020 USING 87 ASDW: ASDW 87 R-V Truck 5.7TBI 4 speed manual.bin
XDF file is: $42-1227747-v5.9.3 -1227747-V5.9.3.xdf
ADX File is: $42-1227747-v5.2 -1227747-V5.2.adx
I do have an Innovate wide band O2 sensor that I want to try to integrate into the system... Just need to figure out how.
Here is a photo of what the datalog looks like after a few minutes after start up and just idling.
Datalog Photo.jpg
Here is the full datalog file. It's several minutes of idle with a couple of some throttle with AND without load here and there:
datalog 2.xdl
Thanks for any help and advice in advance!
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