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  1. Markmx6

    Factory Stand Alone 0411 PCM for 4L80e

    Which software are you using for programming? HPtuners will read the PCM without licensing anything and it will give you all of that information. I also believe that there will be the last four digits of 0411 if it is one. it will also have red and blue printed on the case near the connector.
  2. Markmx6

    No spark

    That would do it. Good to hear you got it running
  3. Markmx6

    1982 GMC - What do I have? What can I tow?

    I would not use the bumper to tow anything over about 3-4k lbs, but I am assuming you are using a frame receiver and using the term Bumper tow. Then you should be ok for that aspect for 10k lbs. You also mentioned a 12 bolt axle. Should be 14, I don't believe there were 12 bolt dually axles...
  4. Markmx6

    No spark

    Contrary to the older belief, you do not need back pressure for an engine to run. You may need to make adjustments to timing and the carburetor to make it run right, but running straight manifolds or headers won't hurt it. Now if you have an engine that is tuned properly with an exhaust on it...
  5. Markmx6

    4L80e 1987 C 10 ls swap not shifting

    That makes perfect sense.
  6. Markmx6

    4L80e 1987 C 10 ls swap not shifting

    Will it do the same thing if you do not have power to the transmission? I thought the 4l80 was second gear with the solenoids all off, and no power would cause that too. I had a 4l80 that I installed in an 85 and when you first put it in drive it would go into first, shift into second when...
  7. Markmx6

    No spark

    I had a suburban that was acting kind of similar and it was driving me nuts. I had the distributor cap off and would crank the motor and see that the rotor had moved, so I thought I was good. I ended up pulling the distributor and found the gear on the bottom was worn out. The distributor would...
  8. Markmx6

    No spark

    Definitely check power to the distributor first, but keep in mind the valve cover is usually a poor place to get ground, the exhaust manifold or cylinder head is a better location. The pop is what is making me think... Was it like an ignition pop? or was it possibly a mechanical pop? If it was...
  9. Markmx6

    Factory Stand Alone 0411 PCM for 4L80e

    I just did it to a 69 gmc with a 350 and a Carter afb carb. The harder part is getting a tach signal to the ECM. I was able to use the tach output on the HEI and a resistor, (I don't recall which value, I tried several) and once I got a clean signal then I had to adjust the tach settings in...
  10. Markmx6

    Protecting catalytic converters?

    That info was accurate as of last year. I haven't worked for him for over 20 years, but he still helps get me parts at wholesale once in a while. I agree the newer replacement cats aren't as valuable as the older ones are. Also in AZ if you turn in scrap with a value over $30 they take your...
  11. Markmx6

    Protecting catalytic converters?

    Here in AZ used cats aren't worth shit. Recyclers won't pay you much for them, the emissions repair shop I used to work for sells them for $20 each to a recycler... You can buy a new cat off of Rockauto for $60. The only ones that are expensive are the ones that are unusual, Ford F-150's etc...
  12. Markmx6

    Old77's 1989 S10 tinkering project

    My first vehicle was an '82 S10 with the the 2.8 V6 and a 5 speed. Loved that truck, then blew the #4 connecting rod out both sides of the block... always wanted to do a V8 swap, never got around to it.
  13. Markmx6

    97 454 L29 Vortec into a 80 K25

    HP Tuners is kinda stupid. you need two credits to license the PCM and that includes the tune that is currently programmed. Then it costs 2 credits to license a new tune even if it is one you download from somewhere else so you can upload it to the PCM... For instance if you get a random 0411...
  14. Markmx6

    97 454 L29 Vortec into a 80 K25

    I totally get that. Here is the pricing as I see it for a Vortec to CNP Reluctor wheel $175 from Efi Connection Crank sensor $10 from Amazon PCM pins $10 from either Efi Connection or Mouser Coils and connectors $Varies depending on the junkyard, mine cost $60 PCM You area already getting one...
  15. Markmx6

    97 454 L29 Vortec into a 80 K25

    When you build your bench harness for tuning outside the vehicle, it may just be worth your time to buy one. Ebay has one for $40. I built mine for damn near nothing, but I had a lot of crap laying around. A google search for 0411 bench harness will give you links to buy one or instructions to...
  16. Markmx6

    97 454 L29 Vortec into a 80 K25

    I was pretty sure that the reason EFI Connection had difficulty having the reluctor wheels manufactured was that they are in fact dual sided like the L21, it just doesn't look like it in the pictures. Here is another site to look at before you start cutting, if I remember correctly this guy had...
  17. Markmx6

    97 454 L29 Vortec into a 80 K25

    http://www.gmtruckcentral.com/articles/24x.html This has some useful information for you. I read through this several times before I started cutting wires
  18. Markmx6

    Tying Saddle Tanks with a T?

    On my 78 the left tank lasts a while and then when you switch to the left tank it runs out very quickly. Switch back to the left tank and you have half a tank again. Either the return line to the right tank is clogged or just not switching over. I guess I am not certain what you are trying to...
  19. Markmx6

    1987 V2500 TBI Wiring Harness / Diagram?

    Do you know which PCM/ECM you have? www.Gearhead-efi.com has ECM pinout diagrams for just about all of the TBI units. They also have a buttload of information about tuning and upgrading if you are interested. A factory service manual like Matt mentioned will still be the best because it will...
  20. Markmx6

    Factory Stand Alone 0411 PCM for 4L80e

    The last one I bought was $17, but they have gone up a little. I already have HPTuners and a bench flash setup, so programming is easy. I'd be happy to help if you get serious about it.
  21. Markmx6

    Factory Stand Alone 0411 PCM for 4L80e

    To go to EFI using an 0411 you will need at least a 4 tooth reluctor wheel (usually behind the timing chain) or you can go to 24x and use coil on plug and get rid of the distributor cap (you still need it in place to run the oil pump) There are all kinds of options. I converted a 99 454 to...
  22. Markmx6

    97 454 L29 Vortec into a 80 K25

    That sucks about the reluctor, I must have been lucky, but it was about 2 years ago... I didn't have my 8.1 at the time so I didn't have it to use as a reference. I just mounted the coils to the factory vortec valve covers. I made some standoffs using some bolts. I ran the bolts from inside the...
  23. Markmx6

    97 454 L29 Vortec into a 80 K25

    Also I would make sure you budget for headers or manifolds for your exhaust. The square body frame rails are 30 inches wide and the OBS is 40 inches wide. That bit me because I wasn't anticipating it when I put a 91 TBI 454 in an 85 C10 that had a 350...
  24. Markmx6

    97 454 L29 Vortec into a 80 K25

    On my 99 Suburban with the 454 I also ran the CNP setup with the 0411. You can buy the reluctor wheel for around $40 because it is the same one the L21 454 uses. If I can find a link I'll post where I got mine from, just make sure to get the crank sensor with it. EFI Connection has them, but at...
  25. Markmx6

    Air Conditioning Swap

    The electrical isn't that bad. Just trace your harness' for power and ground. Wiring can be really simple, you just have to break the sections down into smaller pieces in your mind.

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