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  1. K

    Surging problem and cause

    Thank you for all the replies. I started this thread in Feb and it is now Dec. I had to walk away from it for awhile because of the frustration and stressing myself out. But I've picked it back up for a couple of weeks now. I have spent countless hours reading forums on this subject (surging...
  2. K

    Surging problem and cause

    I have a couple questions that I'm having trouble finding any information about. 1. Where should the throttle plates be set on the throttle body? I would assume that the IAC would make the adjustment for idle but my throttle plates are set at opened as far as they can be set open. Doesn't...
  3. K

    Surging problem and cause

    Here's an update on the situation. Pulled the timing cover to check the timing chain and gears I wanted to know if I had the plastic gears and see what kind of condition they were in and they looked fine I went ahead and replaced them with a double roller chain. Pulled the oil pan and changed...
  4. K

    Surging problem and cause

    yes it does have dual tanks. 87 r10 5.7L
  5. K

    Surging problem and cause

    This is a little of topic but can somebody tell me what the pink/white stripe wire is at the bulkhead of the fuse box? It would be the 3rd wire down on the right side, my guess was the fuel sending unit but this wire has fluctuating voltage. I don't recall fuel sending unit wire having...
  6. K

    Surging problem and cause

    This is the chart I was using
  7. K

    Surging problem and cause

    Can somebody look at this wiring diagram? Where do the injectors get there ground from if Lt Green and Blue are supposed to have 12 to 14v and the Red and White wire is going to the positive on the ICM and Ignition Coil? I seem to remember having a ground at the red and white wires when I was...
  8. K

    Surging problem and cause

    OK well according to that I'm right on the money as far as volts are concerned.
  9. K

    Surging problem and cause

    What kind of readings do ya'll get at the MAP sensor output? It seems if I had an adjustable MAP sensor I could set it at 2v at idle and would be good to go, but who knows. I just can't seem to let this MAP sensor thing go until I find out what the correct reading is supposed to be. Maybe my...
  10. K

    Surging problem and cause

    Well I'm glad you posted that chart, my engine pulls a steady 20 to 21hg at 650 to 700 rpm. I was watching my timing mark with the timing light the other day it was running at about 8 degree advanced and just like a switch flipped it dropped to about 4 degree. My distributor gear looks good...
  11. K

    Surging problem and cause

    My ground strap is good I even added a second one to be sure. My CEL works and I don't get any codes unless I unplug something. I tried a new distributor this last weekend and no change. It wasn't an AC Delco those things are 400+$. I've replaced the temp sensor twice. TPS, ESC, ECM still no...
  12. K

    Surging problem and cause

    anybody have thoughts on possibly a bad PROM?
  13. K

    Surging problem and cause

    Well yesterday I chased out a melted wire that turned out to be the tail lights wire off of the headlight switch I had to unwrap the wires and pull them apart and get that bad wire outta there, went ahead and checked the rest of them, looks ok now. I changed the ECM, MAP, CTS, TPS and ESC still...
  14. K

    Surging problem and cause

    Sorry can you explain to me a little better where that connector is? what color are the wires? I don't know where the governor is lol. I found the the green vss buffer and also found a bunch of melted wires coming off the headlight switch :/
  15. K

    Surging problem and cause

    Alright new ECM is in and no change but here's what I found. Checking the voltage at the ECM with key on voltage is at 4.6v which should be 4.9v although with engine running it is .7v and it should be 2.0v, another thing TCC voltage 0v and should be 14v running and no speed sensor signal 0v...
  16. K

    Surging problem and cause

    It could have been on when it was unplugged and I just didn't notice I've had all the sensors unplugged at one time or another but I'm gonna check tomorrow to make sure. Got my EMC in today so going to over all my grounds again give it a try tomorrow.
  17. K

    Surging problem and cause

    Ok thanks, I have that diagram but still thanks. Yes my check engine light works and I have confirmed it by unplugging MAP sensor. I don't get any codes when everything is hooked up properly.
  18. K

    Surging problem and cause

    Yea I had the wire disconnected before I started testing the wires at the ECM and didn't reset the computer so I was kind of thinking that may be why I wasn't getting any volts after I plugged it in. Do you know what kind of test I need to do on the ESC to tell if its good or not? I've never...
  19. K

    Surging problem and cause

    Nevermind I found it. I will have to check that out today when I get home. I plan on having this thing figured out this weekend. Fingers crossed
  20. K

    Surging problem and cause

    Well at times it did seem to make a difference plugging in the tan/black wire. but yesterday there was no difference. What is the ESC? is that where my egr vacuum plugs in?
  21. K

    Surging problem and cause

    Found a good article about GM's ICM http://www.gmtuners.com/tech/CTS_ICM.htm http://www.gmtuners.com/tech/modes.htm
  22. K

    Surging problem and cause

    https://www.turboimagehost.com/p/31480984/6293071.jpg.html Ok using the ID chart above I did some test on the wires at the ECM harness yesterday with the engine running. I didn't get to go through every wire but I did test the ones highlighted on the chart. My EST REF LOW (BLK/RED) was 0 as...
  23. K

    Tbi conversion help

    I thought this was the EGR solenoid?
  24. K

    Surging problem and cause

    I have read and heard from numerous sources that there was a lot of problems with this these TBI's (ECM's failing, ICM's failing, Distributor problems). Does anybody know what those problems were caused from and if they can be fixed without converting to a carb? I would hate to replace an ECM...
  25. K

    Surging problem and cause

    Well I put in the new AC Delco ICM and same result. Injectors completely shut off at idle. Yes the distributor and ICM was replaced by the previous owner and is new. It's some aftermarket brand not sure what. I tested the pick-up coil with my volt meter and it seems to be fine. I'm stumped...

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