Ok, so a couple more questions with this optical eye, if i'm understanding the threads right, it will be yellow (or brown?) to ECM pin A10, black to ground, and pink/black trace to +12v switched? Also, since this is a retro fit, where would these wires be wired into since they really weren't needed for controlling anything being prior to ECM, ABS, etc? Below is what i have for wires from the optical VSS
1507572_259660920860562_1392387831_n.jpg
Last edited by rokcrawlin85; 02-11-2014 at 03:40 AM.
Bump
Yellow wire should feed the cruise control atleast it did on my 83 G20. I simply spliced into it and hooked it to the VSS pin.Originally Posted by rokcrawlin85
I know it's been forever since I've gotten anything done on this. I finally got the blazer back in one piece (well mostly). I need some helpful ideas of where to start looking for my latest issues with the TBI now that it's back up and running. Its running with a crazy high idle whether its cold or warm. I need ideas on how to go about pin pointing my problem area. I'm suspecting a vac leak, but with it spinning so fast it's really hard to try to do much of anything around the motor. Starting fluid and I don't get along so well.... Any help with ways to track down potential faults?
Just wanted to see what a custom eye sees with my park and drive idle. I think generally it looks pretty smooth and clean just need to pull some fuel out to help the BLM's. Wanted to know if something else stands out to some of you? This is on a old 1228747 ECM using $4F
Thanks for any replys.
Does anything stand out as odd? I noticed when playing it back that the BLM's rise to add fuel initially then drop down to lean it out. Is it normal for the BLM's to cycle this way at times?
Hey guys, I'm back after a long long long break. Finally got an itch to get back on my rig. Hoping to ask a few questions and pick your brains for tuning my motor. Spent the better part of today running back and forth from burning to driving. Long story short, I've run out of injector duty cycle. It falls flat on it's face and can't pump enough fuel after climbing above 2000 RPM and about 3/4 throttle. I was getting very excited tuning today. Things were actually going quite well. Actually seeing improvements with every tune I tried. Then I've come to the sad conclusion, I'm out of injector.
Here's what I've done so far,
Upped the fuel pressure from 15 to 18 PSI. Lowered the entire fuel table by .85 to compensate for the added fuel then started tuning again. I took a screen shot so you can look at and notice the massive demand for fuel on the table. I can't give it enough to make it happy.
I guess I'm in need of knowing if I'm going to have to upgrade to larger injectors to satisfy this motor, or are there some numbers/parameters I can change in the tables to make it pump more? I know I've left out a lot of info I'm sure you'll want. Please please just ask and I'll post it up. Would really like to know what my next step is going to have to be. Thank you much for any help.
ECM-1228747
If you can read it, all that info should be across the header on the screenshot.
Attachment 10361
Last edited by rokcrawlin85; 03-21-2016 at 03:32 AM.
Just was looking around in the bin, does 98 for a BPW sound correct? As far as I'm aware, I'm just using the stock 350 TBI injectors, so 55#? If my searching is correct that most bins with 55# injectors run a BPW of 138? By changing this number in the bin, what effect does it have on the injectors? Smaller the BPW=? Larger the BPW=?
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