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  1. N

    Vortec 350 doesn't start. Spark advance shows 0deg.

    Cap and rotor contacts were in very bad condition. Started instantly after cap& rotor change. Rearmost cap attaching screw didn't tighten to the distributor, so I replaced it with a small bolt + 2 nuts.
  2. N

    Vortec 350 doesn't start. Spark advance shows 0deg.

    1999 Tahoe 350 vortec. Has been sitting a week or two. Doesn't start. Gas smell is coming from exhaust, so it's an ignition problem. When it's turning, scanning software shows constant 0 degrees of spark advance. Last time the truck was started after some sitting, it had occasional stumbling...
  3. N

    Yukon/Tahoe Performance

    7.8 seconds for a Suburban with those mods sounds unbelievable. Not saying I don't believe you. :) That's pretty much the same as my LT1 Caprice stw. I thought my Tahoe was doing OK at 10 seconds (4-door, 4x4, L31, 265/75R16, 3.73:1, under 120k, some tuning, idles great).
  4. N

    L31 Spark retard at hi rpm & load

    Thanks, everybody! I tuned it using 1st gear only. (Not easy to do multiple 100mph+ runs to log hi rpms at 3rd :) ) I get KR only occasionally now at 1st. I had to go very near to stock settings at high rpms. My trans is working flawlessly (knocking the wood). I'll upgrade to 411 at some...
  5. N

    L31 Spark retard at hi rpm & load

    Thanks a lot for that information, it's very good to know! It's probably the same thing causing this. I saw a lot of retard at first gear also at 28 degrees. However going from about 23 to 17.5 didn't change anything; some KR at 2nd gear, never at 1st. Did your transmission act up in any way...
  6. N

    L31 Spark retard at hi rpm & load

    Thanks for your answers! I think I'll try lowering the advance a greater amount first.
  7. N

    L31 Spark retard at hi rpm & load

    Hi, I was tuning my '99 Tahoe and noticed there's some knock retard at high load and high rpm. I started with a tune with much advanced timing, and ended up retarding the timing at high rpm even compared to stock tune. It helped some, but it's still there. A wot run regularily brings a...
  8. N

    New R&P clunk at every pinion round

    Thanks! You're right, I better get the clunk away before proceeding. If there's not any clear visible fault in the pinion, maybe changing the setup a little will help. Backlash is about .007", so it's close to the low limit for 5-cut gears.
  9. N

    New R&P clunk at every pinion round

    Hi, I installed new ring and pinion. After finishing everything and putting oil in, I rotated the pinion. I noticed, there's a strange, kind of slight clunking sound at every rotation at the same spot. I guess there's some kind of defect in a pinion tooth. I was thinking about first draining...
  10. N

    My Big 3 Kits

    The kits still available, Xanatost? I'm interested in a kit for top post dual batteries in '99 Tahoe. Could the starter cable be 0 gauge, too?
  11. N

    Thought I’d update progress after a year of ownership

    Thanks! That's the same size I was going to have. :)
  12. N

    96 Tahoe vibrating at speed

    My Tahoe had rapid shaking that started between 50 and 55mph. Seemed to get worse the faster I drove. I don't think I ever drove faster than 65. I noticed one of the rear u-joint strap bolts was backed off from its thread. Apparently had been so for a while. I tightened it up, which helped...
  13. N

    Thought I’d update progress after a year of ownership

    Great work, 95bucket! I'm considering having steelies and center caps. What size are those tires?
  14. N

    Let's talk about rear gear ratio on these 1500's, mostly street driving, limited towing

    I'm going to regear a 1999 Tahoe 4x4. Where is the ABS reluctor ring on these trucks; T-case or rear axle? Do I have to swap that also, or is it just a programming issue?
  15. N

    Hello from Finland!

    Hi there! I've had some 80's to 90's GM cars and trucks earlier. Currently I have a '95 caprice stw and a 1950 Chevy project. Now I'm waiting for a 1999 Tahoe to arrive to me from California! This seems like a good forum. I've been lurking here every now and then, and have some questions...

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