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  1. Road Trip

    Microsecond misfire at hiway speed

    Greetings Srg1016, I just stumbled across this thread thanks to yesterday's status update. I noticed that you didn't mention any SES light, so I'm going to assume that you are experiencing this millisecond misfire yet no SES light / stored DTC codes? I'd like to first explain how this is...
  2. Road Trip

    1994 k1500 wild misfire

    Hello name, The differences in the resistance values of various new spark plug wires isn't something to be overly concerned about since we're using such high voltages to drive them. For me, the primary attraction of the wire-wound spark plug wires is that they remain the same 1,2...5+ years...
  3. Road Trip

    350 stroker build (ca smog legal?)

    That's a twist. Maybe because I'm deep in the heart of the rust belt, I've always been subjected to an annual safety inspection here in NY/NE. Ouch. Thankfully I'm headed to NH, and my 25 year old truck easily clears the 20 year old hurdle for no longer being tested for emissions. (Even...
  4. Road Trip

    350 stroker build (ca smog legal?)

    I must look like a s*cker in person then, for with my luck if I was in Cali they would be all in my chili, if you know what I mean. :0) For example, some years ago back when gas hit $4.00/gallon for the very first time, I flew on a one-way flight to TX and bought a well-worn 300K mile '01 Honda...
  5. Road Trip

    Gas Mileage

    Not only was your engine 'acting' smaller due to the lower air density, but also your Pathfinder was acting like it had a virtual smaller total frontal area at elevation in CO as compared to driving the same speed while pushing through 'closer to sea level air density' in TX. And of course the...
  6. Road Trip

    1997 c2500 rear end

    4.10 = ~10% higher engine rpm in 3rd gear for any given speed vs your current setup. Given the size of your trailer, your engine will thank you for the improved gear ratio. :0) BTW, *nice* photo of a hard-working rig!
  7. Road Trip

    1997 c2500 rear end

    Upgrading to a 4.10 gives the engine ~10% more advantage over the payload than your current 3.73. Another way of looking at it is to imagine staying with the 3.73 but upping the 454 10% in displacement (+45ci) to a 499ci engine. Equally good, just implemented on the other end of the powertrain...
  8. Road Trip

    Gas Mileage

    A lot of GMT400 owners don't realize that when you task a single ignition coil to feed high KV pulses/sparks to all *8* cylinders, that if the very best materials & manufacturing methods aren't used, sooner rather than later in this high duty cycle environment the coil will lose control of all...
  9. Road Trip

    How could I fix this

    Nice recovery! I'm of the opinion that wiring harness failures are similar to the rusty areas that you repaired. That is, people think that an aging wiring harness is equally bad throughout it's entirety. In reality, even in a harness exhibiting flaky behavior the wear/damage is nearly always...
  10. Road Trip

    1999 L31 Engine with nearly 260k, Timing chain plus what else?

    File me under acquainted rather than reasonably proficient -- it's been a lot of years since I've stopped and taken the time to analyze a circuit like this: And of course his 2nd Law: His Laws are part of my overall electrical belief system, and I have used the general principles to...
  11. Road Trip

    1994 k1500 wild misfire

    I appreciate the very complete status update. Glad to hear that the new fuel filter and EGR valve took care of the issues that they did. And most importantly, you took the time to feed this info back to the forum as another real world data points for others to learn from. The short answer is...
  12. Road Trip

    I’m a DA…what maintenance have you screwed up?

    Highly recommended. If you ever trip over a 425ci Olds, that is one hard-pulling, effortlessly shrugged off over-enthusiastic use by a teenager, powerplant. If there was a weak spot I never found it. The one I had was a '66, and had a switch-pitch Turbo 400 behind it. The car I had it in was...
  13. Road Trip

    I’m a DA…what maintenance have you screwed up?

    The single biggest mistake I've ever made in the engine bay all started by making an assumption that a Pontiac V8 is a Pontiac V8, since it's all based off the same block? Back in the late '70s, while I was working in a 1 1/2 man garage, the shop owner had a very good long time customer who...
  14. Road Trip

    Cruise control fuse location

    Greetings vellsfj, I pulled this from the '91 electrical manual, but it should match what you've got. To answer your question, yes there is a fuse protecting the truck from either a Cruise Control failure and/or chafe in the wiring feeding it: If this both answers your question and also...
  15. Road Trip

    1994 k1500 wild misfire

    This is good troubleshooting info. Many times knowing all the ways that an engine will work correctly can help us eliminate some of the possibilities of what is causing the engine to misbehave at specific times. By the way, I fully believe that an engine can run well cold but misfire when up...
  16. Road Trip

    1999 L31 Engine with nearly 260k, Timing chain plus what else?

    Wow. Wondering if there's room for a layer of carefully-trimmed Dynamat on top of that cover? I was really thinking of upgrading to that aluminum cover down the road, but at the same time I don't want to amplify the chain noise? Thanks for the heads-up based on your firsthand experience...
  17. Road Trip

    1999 L31 Engine with nearly 260k, Timing chain plus what else?

    I like your thought process, for Preventive Maintenance now is preferable to being stuck on the side of the road later, especially during precious vacation / family outing time. **** Here's a thought. I'm thinking that your L31 Vortec was built with a roller chain, and they can run a lot of...
  18. Road Trip

    Collapsed Lifters 95 GenV Big Block

    Greetings grampadirt, As a fellow 454 owner I've been watching with interest. Once you get these Polylocks installed it would be great if you could include a photo or 2 of what it looks like? IMHO, one can never have too many photos of the porcupine heads with the valve covers off. :0) By...
  19. Road Trip

    Bad running after manual swap

    I'm with the Nitro Junkie, electrical troubleshooting with a bad ground plane is like troubleshooting on top of jello. But troubleshooting on top of a solid ground plane is like troubleshooting on top of granite. As you said, even if restoring the grounds to new/better than new condition...
  20. Road Trip

    1994 k1500 wild misfire

    Sounds good! By the way, bonus points if you find something amiss you then take clear photos and share them here so that others can learn from it. Sometimes showing how it's not done is even more informative than showing how it's supposed to be done. The whole compare & contrast teaching...
  21. Road Trip

    1994 k1500 wild misfire

    Hello name, There actually is 1 best way, and many many suboptimal ways to route the spark plug wires on a SBC. Especially the ones in the GMT400 family, for the way these engines are tasked vs the emissions calibration the secondary side of the ignition system is run right up against the...
  22. Road Trip

    Ambient temp sensor

    Greetings twebuh, I scanned the '99 FSM .pdf file, and first found the removal and replacement guidance for this sensor: Elsewhere, I discovered in the wiring diagrams that this temp signal is handled by electrical circuit #735. Rescanning for all instances of '735' I subsequently...
  23. Road Trip

    93 K1500 Speedo/odometer intermittently function

    @thinger2 is on the money with his guidance. Here's a couple of illustrations from the '93 FSM to give you a visual clue or 2 about what he's talking about. By the way, the ground that affects nearly everything in the cab was named G202 by the General. Physical location illustration: And...
  24. Road Trip

    Bad running after manual swap

    Hello JPVortex, I checked the '94 FSM wiring diagrams for the TBI setup, and there are actually *3* physically separate communication paths between the '94 PCU (ECU) and the troubleshooter in the interior. 1 for the SES light, and *2* in the ALDL connector. * The first is a dedicated circuit...
  25. Road Trip

    Code 32 with a high flow exhaust.

    Hello Nick88, When dealing with any function like this, from my troubleshooting perspective they fall into 3 distinct categories: * ALWAYS works (Never throws a Code 32) * Intermittently Works / Fails (Periodically throws a Code 32) * NEVER works (Can't get Code 32 to clear) ****...

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