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  1. J

    1993 Chevy K3500 - Rough idle and stall

    I purchased what was described as New, Flow Matched Fuel Injectors. The brand is GP Sorensen. But, it was basically the only thing AutoZone had in stock.
  2. J

    1993 Chevy K3500 - Rough idle and stall

    @PlayingWithTBI, good point on the grounding straps. I forgot to mention this in my earlier post. When replacing the battery cables I noticed the grounding strap from the engine to the frame was completely severed. Since the body ground strap was right there I replaced both making sure they...
  3. J

    1993 Chevy K3500 - Rough idle and stall

    In the recording of the driving session in the scan tool the long term fuel trim (BLM) stayed at 135 or above. This including periods of idling and driving. I believe higher numbers are lean and normal is 128. (could be wrong to feel free to correct me.) On a cold start it idles about between...
  4. J

    1993 Chevy K3500 - Rough idle and stall

    Well, when we took the truck out the next day we ran into additional trouble but more on that later in the post. I hooked up the scanner and went for a drive (emissions testing and motor vehicle if all goes good). I remembered to record the scan this time so I could go back and look at it. As...
  5. J

    1993 Chevy K3500 - Rough idle and stall

    Well, friends, we have progress! I completed the smoke testing of the intake. I completely removed the throttle body from the intake and injected smoke into just the intake to test the gasket. As it turns out, the EGR valve leaked like crazy. Replaced the EGR valve. I reassembled the...
  6. J

    1993 Chevy K3500 - Rough idle and stall

    Happy Friday friends! This week got really busy at work and I haven't looked at the truck again until today. I connected my scanner to the truck and monitored the short and long term fuel trends (INT and BLM counters). Both were less than 128 but above 120. I went ahead and replaced the...
  7. J

    1993 Chevy K3500 - Rough idle and stall

    @Schurkey, thank you for the detailed reply! Here is a photo of the intake manifold before I cleaned it up. (broken bolt has already been extracted.) The 'plenum' I'm talking about is the space beneath the intake where you can see the lifter rods. I did use a gasket set that had the rear...
  8. J

    1993 Chevy K3500 - Rough idle and stall

    @Schurkey, here are the compression numbers by cylinder: 1 - 160 2 - 170 3 - 165 4 - 160 5 - 160 6 - 160 7 - 160 8 - 170 I'm not sure how to look at the fuel trims but I'll research that. If you know how to do that with TunerPro RT, I'm all ears... The coolant sensor does read at ambient temp...
  9. J

    1993 Chevy K3500 - Rough idle and stall

    Thanks, I'll look into it further. I was looking at the scan data I collected last night and noticed the automatic spark advance was almost 17 degrees advanced of TDC. Is this a normal range? UPDATE: Answered my own question, these timing values align with the values in the .bin file tables...
  10. J

    1993 Chevy K3500 - Rough idle and stall

    Okay, it has been a full day. My ALDL cable arrived yesterday and I was able to connect to the PCM with TunerProRT using the $85 .xdl and .adx files from here: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?317-16147060-PCM-Information-85 (@EagleMark post from 01-02-2012). I started...
  11. J

    1993 Chevy K3500 - Rough idle and stall

    @PlayingWithTBI, I want to make sure I'm using the correct tables for reverence in checking the calibration of the IAC. The document you linked refers to a "Target Idle RPM vs Coolant Temp" table. I understand that every vehicle could be different. The tables I'm seeing in the base .bin for...
  12. J

    1993 Chevy K3500 - Rough idle and stall

    Well, looks like the truck is a driveway ornament for this week. I'll have to get to it next weekend. Thanks for the info! I'll follow up when I have more info.
  13. J

    1993 Chevy K3500 - Rough idle and stall

    Thanks for your quick reply! The ‘calibration’ process I read was simply to drive the vehicle above 40 MPH for 10 minutes to let the computer adjust. Based on the document you linked to, that wasn’t it. (I think those directions were with the new IAC valve.) I don’t have a scan tool or data...
  14. J

    1993 Chevy K3500 - Rough idle and stall

    Hello Friends! My son and I are working on a 'project truck' that is his first truck. It was found in someone's backyard and hadn't been regularly driven in almost two years. It wouldn't start but a TBI rebuild kit and new injectors later, we drove it home. When idling, there was a noticeable...

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