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  1. 95TwinTT

    New Member & i hope someone has some other ideas

    Assuming all is correct mechanically and all sensors are good, you are down to fuel map and timing tables. I’m sure Justin can make it right. Good luck……. Oh, and welcome to the forum……. :)
  2. 95TwinTT

    New Member & i hope someone has some other ideas

    Couple of things to verify… Any chance the O2 sensors got mixed up while doing the new exhaust? There are four O2’s, Bank One = Tan with white and Purple with white Bank two = Tan and Purple All four use pink and...
  3. 95TwinTT

    New Member & i hope someone has some other ideas

    Still have all the Cat's and O2 sensor's? Do you know what caused the original engine to fail?
  4. 95TwinTT

    should i change out fuel pump?

    The fuel pressure should be slightly lower while at idle or cruising. Fuel pressure regulator on the end of the fuel rail, lets more fuel return to the tank controlled by vacuum from the intake manifold. Try checking the fuel pressure without starting the engine. It does not sound...
  5. 95TwinTT

    Spark plugs>!>?

    I think the multiple spark discharge (MSD) ignition is a waste of money unless you are using one of their other features like rev limiter or spark retard for boost. Most after market, ignition boxes just overdrive the coils with higher input voltage. If they were that much of an advantage...
  6. 95TwinTT

    Timing Adjustments??

    Small changes with testing makes sense. The computer using MAP for one axis of the timing table, means that weather conditions can also affect the results. It would be interesting to know where the computer takes the timing, when the tan wire is hooked back up. Sorry I can’t be more...
  7. 95TwinTT

    Timing Adjustments??

    The Haynes manual describes a routine for checking or adjusting the timing on a 95. The 95 was still using the OBD-1. They mention a tan wire with black stripe that is located under the dash, below the glove box. It needs to be disconnected to disable the EST system. (Electronic Spark...
  8. 95TwinTT

    Selling the Hoe' (third times a charm!)

    This is not a good time to be taking on debt. I’m sure you have a solid job and a six year loan is not a big deal, but in today’s economy, six years is an eternity. You might want to put it off until after the November elections. That may answer a few important questions………. GM will be...
  9. 95TwinTT

    Electric Fans

    The Perma Cool fan package has a temp sensor fastened to the inside of it's frame that senses the temp from the radiator. It has trim pots that you set for on/off temps plus some safety over rides as well. The relays are also built in. They also have an extra wire connection for manual...
  10. 95TwinTT

    Supercharging questions??

    If you are planning on using the OBD2 with the S/C, talk to one of the “tuners” that does forced induction and follow their instructions. Adding air by itself does not increase power. If your going into a bone stock engine, the compression ratio is probably around 10 to 1. There is not...
  11. 95TwinTT

    manual in a 99 yukon?

    The 4L80e trans is certainly tuff enough for anything you might want to do, but it will require a commitment to see it through. Many guys have started down this road and lost interest. You need to do the research up front before you start. If four wheel drive is involved, there are more...
  12. 95TwinTT

    HID lamp warm-up

    I don't know anyone with after market HID's, but I have Factory HID's in a new GM car and they don't have any warm up time. Same with everyone I know with factory HID's. They instantly light up at full brightness and never change color or brightness. It has to be something with the...
  13. 95TwinTT

    A/C question

    Air Conditioners work best with the proper amount of freon to match the system displacement. Too little and the liquid does not reach the evaporator, too much and there is not enough room for liquid freon, to totally evaporate. Either condition causes poor performance. After replacement...
  14. 95TwinTT

    spark plug gap

    1988 through 1995 calls for .035 in. 1996 and later calls for .060 in. Should be on the emissions label under the hood.
  15. 95TwinTT

    1996 Yukon Transfer Case Problem?

    DO NOT remove the cross member with the rivits. The cross member you want to mess with is the one that has the transmission mount on it. It has bolts holding it to the frame. Those bolts have been known to be difficult if they are rusted. The nut on the top has to travel over an inch or...
  16. 95TwinTT

    1998-1999 Tahoe 2 Door model info, please help!

    My understanding is the "Sport" is more about trim and features and the Z71 is more about stiff shocks and suspension. I think the sport came with the wheel farings and leather seats, etc. If you like a rough ride, Z71 is the way to go. :)
  17. 95TwinTT

    Drum brake Gurus, please come inside.

    Hey, Thanks. Just so you know.......... The brake adjuster can not advance to the next tooth of the wheel, unless there is enough movement to allow it to reach the next tooth. In other words, It can not over adjust itself..... Use your parking brake as much as you want........
  18. 95TwinTT

    Drum brake Gurus, please come inside.

    FYI This is what the Haynes Repair Manual mentions about self adjusters... "Back the vehicle up, making repeated stops, to actuate the self-adjusters, which work only when the vehicle is in reverse." :)
  19. 95TwinTT

    Drum brake Gurus, please come inside.

    It is very likely that the parking brake can adjust the brakes as well. I know for certain that the adjustment also happens in reverse for those of us that never use the parking brake. I have not used the parking brake in any of my cars and trucks for the past 45 years and they always had...
  20. 95TwinTT

    trans ?

    My “Tuner” stopped by yesterday and today for a pair of 3 hour “fine tunning” sessions. As you know wide open throttle on a dyno is easy to set up, but highway and city cruising smoothness takes time. We did the city yesterday and the highway today. We use a LM2 wideband in the tailpipe as a...
  21. 95TwinTT

    Drum brake Gurus, please come inside.

    It was my understanding that the auto adjustors were intended to adjust while braking in Reverse. if there too much travel, the flexing allows the adjuster to reach another tooth on the wheel. Brake shoes are typically made to be more effecient on forward braking than reverse. That is...
  22. 95TwinTT

    trans ?

    I found that the existing cross member for the 4L60 can be slid back to the next set of holes in the frame and works for the 4L80 using the same mount. If the trans is coming from a “doner” truck, take the transfer case and both drive shafts as well. As far as acceleration, it is true...
  23. 95TwinTT

    trans ?

    The 4L80e fits just fine. If you are removing it from the HD PU truck, include the wiring harness, ECM, shift linkage if manual 4x4 and dip stick and tube if possible. OBD2 handles the trans but needs to have the tweaked. There are a few minor “pin out” differences between the two wiring...
  24. 95TwinTT

    What have you done for your Tahoe today?

    Just put on a new set of tires, Pirelli Scorpion Zero’s. 285/55R18’s Modified the rear leaf springs for added stability under hard acceleration. Upped the stall speed to 3500 rpms. :)
  25. 95TwinTT

    Running Boards

    With so many guys that dislike stock running boards, there must be 8 "C" brackets floating around out there somewhere. If nothing else, still hanging on the underside of many these Tahoes. Let's be "green" and recycle them. Get them together and send them to nodora96. :hands:

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