Recent content by Markmartin01

  1. Markmartin01

    Stumble under load, out of ideas

    I've read conflicting opinions on the knock sensor. Some say without continuity the ECM defaults to a low timing default, some say the ECM only intervenes once knock is detected. I don't know enough about these early ECM tables to know which is actually correct.
  2. Markmartin01

    Stumble under load, out of ideas

    Partially solved. The stumble once warm was the temp sensor. It would ohm fine until it got nearly to operating temp, then it went to 4M ohms. Still has a warm idle hunt, so that's the next part. That also never occurred until recently, seems to coincide with the temp sensor failure.
  3. Markmartin01

    Stumble under load, out of ideas

    I did run it down the road with a gauge on it and it stayed steady at 12 PSI. HOWEVER....this morning I notice a no start and no fuel spray on startup. So it's entirely possible the FP had micro drops that the pressure gauge wasn't sensitive enough to reflect. Need to do some electrical...
  4. Markmartin01

    Stumble under load, out of ideas

    @Schurkey Fuel pressure gauge I tried on my '14 yukon as a control and it was accurate. Knock sensor is currently unhooked because it loves to come unplugged (not a good positive click) but has never caused an issue before....could it suddenly show different behavior out of the blue? Put a...
  5. Markmartin01

    Stumble under load, out of ideas

    91 RCSB Z71, stock under the hood other than a small Elgin RV cam. Has always ran fine, started it the other day and it has an occasional rough idle and what sounds like a lean condition under low RPM load, haven't tried WOT as that just sounds like a bad idea. Cap, rotor, wires are clean and...
  6. Markmartin01

    Gets hot after adding shroud?

    So I have a 91, 350, pretty run of the mill truck. Converted to 16" electric fan a couple of years ago after the water pump mount sheared and about threw the mechanical fan through my face. Cooled fine at speed without a shroud, wants to get hot after driving on the freeway and pulling off...
  7. Markmartin01

    To LS or not to LS, that is the question

    I have considered this myself. I think the question for me comes down to power curve and intended use of the truck. TBI was a torque focused motor that makes good power under 4k. LS engines have outstanding heads that flow great and make killer HP but generally at a higher rpm. So are you towing...
  8. Markmartin01

    Factory color that no one will admit to!!

    GM used multiple color variants of the same paint code and the only way to mix it correct is visual comparison and tinting. Nissan was the worst though, they had 11 variants of the same champagne color on sentras in the late 90's. I mixed a ton of PPG back in the day and it's a nightmare.
  9. Markmartin01

    Side molding

    Year 3 for mine and they've held fine. Make sure the paint is clean and temp is up. If it's a little cool you'll struggle getting the foam tape to stick. Hotter the better.
  10. Markmartin01

    Side molding

    I used the precut kit from LMC. You can get a roll and cut your own but the edges will be raw rubber and not finished edges.
  11. Markmartin01

    I want to replace the Moonie gauges in my 88

    Both valid points, thanks for the input. Just wanted to make OP aware of the issue before hand so he doesn't have to trial and error through it like I did.
  12. Markmartin01

    I want to replace the Moonie gauges in my 88

    If you huck the original cluster keep in mind you will have to find a way to excite the alternator regulator as the charge light in the original cluster completes that circuit.
  13. Markmartin01

    Pass on the intellitronix digital cluster!

    I did see the note @someotherguy , but that's a note about LS use. There are also no turn signals as it states, doesn't specify anything on speedo issues, doesn't mention that the alternator regulator is excited by the "charge" bulb in the original cluster, and so on. There is also apparently...
  14. Markmartin01

    Cold Air Intake on TBI 350.

    There is an episode of Enginemasters on Motortrend where they play with various air filters and configurations on a dyno. Granted, they were only testing single filter top mounted options on a carb, but the best possible config for HP on the dyno was an air filter that was breathing through the...
  15. Markmartin01

    Pass on the intellitronix digital cluster!

    for 88-91, originally the VSS was converted by the cluster itself so without the speedo plugged into the circuit, it's completely useless open circuit. Maybe if I did some PCB stipping and some solder work and enough trial and error I "might" have been able to make it work. In the end, I just...
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