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Topic Review (Newest First)
12-09-2019 08:46 AM
Marty, SoCal
Quote:
Originally Posted by Scrammbledeggs View Post
start off by saying I did the 5.3/4l60e swap into a 1981 cj8,put all the emissions parts in cats,o2 sensors,charcoal canister, purge valve,tank pressure sensor,check engine lite,sent the harness and computer to wayne,have driven it about 500 miles now with no cel so far.The jeep had the 151 in it before the swap,now with the v8 its a lot of fun.So now I take it to the referee to get the blessing and he askswhat I did to it before hooking it up to his computer,so I tell him I got the donor parts from a 2005 Tahoe and he stops me rite there and says I couldn't do the swap because the Tahoe is considered a medium duty machine and the scrambler is a light duty machine(wtf).If anybody has any ideas please help I don't want to just give up on this project,to much time and money to just forget it. All ears
In Commiefornia, the donor engine must be from the same weight class vehicle as the jeep, meaning that in the case of the CJ, you must get the donor engine and all wiring and smog accessories from a light duty vehicle with a gross weight of 6000lbs or lower. The emissions label will say "Light Duty Truck". Not sure what the GVWR is on a Tahoe. You must find a stock, unmodified PCM with a GM VIN from a light duty truck, California emissions certified if your CJ originally was sold with CA emissions. Maybe from a 5.3l Trailblazer or H3 Hummer? The only thing you can modify on the PCM is anti-theft if it had it.

All the rules are on the BAR's website, in the 2019 Smog Check Reference guide, Appendix D, on page 45:
https://smogcheck.ca.gov/pdf/Smog_Ch...ence_Guide.pdf
12-09-2019 07:54 AM
fredycruger
Quote:
Originally Posted by ultimate fighter View Post

nice UF you got it done
12-09-2019 05:49 AM
AHenry014 Here is my experience. I asked Wayne about changing the VIN in the GM PCM and he said he can only change it to another compatible GM vin, not the jeep vin. Mine comes up as an 05 silverado i believe. When i took it in for emissions, i told them it was swapped and would pull a GM vin when plugged in. All they did was change the engine size spec for my Jeep vin within the CT emissions system, so it will forever be 5.3 liters. It was a fairly painless experience, just ensure you are otherwise emissions legal for your area. They nearly failed me for a non-op check engine light, but i relocated it to the knee panel. It happens to be fairly obscured by the wiper stalk, which is why they missed it.

Reading back to your post, i am astonished that they are trying to plug the thing in at all. Its pre-obd2, so it should be rolled and sniffed. You would pass with flying colors with all the modern equipment. Maybe find another spot and not tell them? You could get the cj8 with a v8 right? If they really care, tell them its an EFI modified 304/360. No one will be the wiser.
12-07-2019 06:23 AM
cj7ole Ask Wayne, he has probably been there before. Must be something in the ECU that id's the donor, maybe that can be part of the flash? BTH mine was from an '07 Tahoe, he did the ecu and harness in 2011. Sure glad I don't live in Kalifornia. I like JayMcJay's approach.
12-06-2019 09:47 PM
Scrammbledeggs If he hooks up to me then I’m locked into Sacramento then they got me,
12-06-2019 07:15 PM
ultimate fighter
12-06-2019 01:51 PM
JayMcJay
Quote:
Originally Posted by Scrammbledeggs View Post
So when he hooks up to it with his machine Whats going to tell him itís from
I dunno. I'm just thinking that if he failed you based strictly on your story and not data, tell him a different story.
So that you're not lying, I'll tell you it came from a 2005 Camaro.
Hey, it came from a 2005 Camaro.
Now you can say 'I was told it's from a 2005 Camaro'

If it turns out that once he connects up to it he is able to tell you that it's from a Tahoe somehow you'll stand corrected. you can then say 'huh. weird. I was told it was from a 2005 Camaro. I'll have to look into that'.
12-06-2019 01:45 PM
Scrammbledeggs So when he hooks up to it with his machine Whats going to tell him it’s from
12-05-2019 03:49 PM
JayMcJay Tell him it's out of a 2005 Camaro. Problem solved?
12-05-2019 03:28 PM
Scrammbledeggs
california swap

start off by saying I did the 5.3/4l60e swap into a 1981 cj8,put all the emissions parts in cats,o2 sensors,charcoal canister, purge valve,tank pressure sensor,check engine lite,sent the harness and computer to wayne,have driven it about 500 miles now with no cel so far.The jeep had the 151 in it before the swap,now with the v8 its a lot of fun.So now I take it to the referee to get the blessing and he askswhat I did to it before hooking it up to his computer,so I tell him I got the donor parts from a 2005 Tahoe and he stops me rite there and says I couldn't do the swap because the Tahoe is considered a medium duty machine and the scrambler is a light duty machine(wtf).If anybody has any ideas please help I don't want to just give up on this project,to much time and money to just forget it. All ears
10-22-2019 09:53 AM
motorsports3
Quote:
Originally Posted by bkh98 View Post
I have a brand new unopened Novak emulator I'm not going to use that I'll sell.
PM sent
10-21-2019 06:42 PM
bkh98 I have a brand new unopened Novak emulator I'm not going to use that I'll sell.
10-21-2019 02:11 PM
deri0953
Quote:
Originally Posted by motorsports3 View Post
Has anyone managed to get the stock tach to work on a TJ without an emulators, or has anyone built their own emulator? Some guy on Facebook claims to have done it, but I canít get the results to duplicate. Iíd rather not have to use an emulator if possible, and Iíd rather not have to buy one.
I made my stock tachometer work in my '01 TJ and in an '04 TJ 10-11 years ago. I did a lot of searching at the time and as far as I could tell, mine was the first, or at least the first posted online. It still works as it should in both Jeeps. Both Jeeps have 5.3 LM7 engines. I posted all of the information that I had learned in the process on Jeeps Unlimited. All of that stuff is gone now. I also sent it to Novak when they started asking questions a few years later. I'd like to believe that their emulator is directly connected to what I had learned in the process. I contacted Advance Adapters about it as well, but they were not interested.

I did not go the route of designing a circuit to send to the Jeep computer, even though that is within the scope of where I work and what I do. Instead, I went with an all mechanical setup that still uses the Jeep crank and camshaft sensors. It cost less than $100, but there were quite a few hours of machining time for a camshaft sensor trigger and for a trigger ring that goes on the GM balancer. It's not the simplest setup, but it has worked well so far. If I were to do it again, I would just purchase the Novak emulator and be done with it.
10-21-2019 12:57 PM
motorsports3
Quote:
Originally Posted by Alexia View Post
I made my own custom circuit board and wrote code for a microcontroller that translates all the messages from GMLAN to Chrysler PCI. It has taken me a while to accomplish this since there are no longer drop in transceiver chips for the PCI bus.

It is something I intend to sell as product in the future so I need to setup a vendor account here once I am back in the USA.
Thatís awesome. I canít wait and hope to be able to run it one day.
10-21-2019 12:42 PM
Alexia
Quote:
Originally Posted by motorsports3 View Post
I remember you were talking us about that. Ultimately that would be my goal but way beyond my skills right now.

Do you mind sharing what you did to get the tach to work? So I could atleast go that route.

Trying to stay away from the whole emulator thing.
I made my own custom circuit board and wrote code for a microcontroller that translates all the messages from GMLAN to Chrysler PCI. It has taken me a while to accomplish this since there are no longer drop in transceiver chips for the PCI bus.

It is something I intend to sell as product in the future so I need to setup a vendor account here once I am back in the USA.
10-21-2019 12:37 PM
cobra30689 Gotta pick some brains here if I may.....planning a swap on a YJ. Thinking about going with a GM NV3500 (NOT the Jeep 3550, a lot of the forum searches I have done manage to confuse the two) with a 5 bolt case flange, and a hybrid 231 transfer case, front half sourced from an older S10....as they are still dirt cheap in my area. Has anyone gone this route? My concern is the length....as I have never seen one closeup and have no frame of reference. Thanks in advance....
10-21-2019 12:09 PM
motorsports3
Quote:
Originally Posted by Alexia View Post
I run the entire instrument cluster in my LJ off the Gen IV GM ECM in my swap and tossed the stock computer. It is not an emulator though.
I remember you were talking us about that. Ultimately that would be my goal but way beyond my skills right now.

Do you mind sharing what you did to get the tach to work? So I could atleast go that route.

Trying to stay away from the whole emulator thing.
10-21-2019 12:01 PM
Alexia
Quote:
Originally Posted by motorsports3 View Post
Has anyone managed to get the stock tach to work on a TJ without an emulators, or has anyone built their own emulator? Some guy on Facebook claims to have done it, but I canít get the results to duplicate. Iíd rather not have to use an emulator if possible, and Iíd rather not have to buy one.
I run the entire instrument cluster in my LJ off the Gen IV GM ECM in my swap and tossed the stock computer. It is not an emulator though.
10-21-2019 08:47 AM
motorsports3 Yeah thatís all what Iíve heard /Thought, but this is what he is saying you have to do:


ďTACHOMETER:

And now for the info you came here for. First off, I cannot take full credit for this. Greg Byars was kind enough bounce a few messages back and forth with me with research he did, and in the end, it was a $0 working setup😁

First and foremost, you will need access to tuning software to make adjustments to your Tach Output settings on your GM ECM. What you need to change in you tach output settings (see photos) is the HIgh and Low resolutions. Some ECM's will have a "Pullup" or "No Pullup" Type option in addition to the Resolution. Set the Type (if applies) to "No Pullup", set you High Resolution to "1" and your Low Resolution to "1" (see photos). Flash this back to the ECM.

Next, you will need to locate your Tach Output wire on your GM ECM, it is a solid white wire on pin 10. (99-02 ECM tach wire is on the RED connector while 03-07 is on the GREEN connector. This applies to the 4.8/5.3/6.0 engines)

Then, on the BLACK connector on your Jeep ECM, you want to locate pin 8 (CRANKSHAFT POSITION SENSOR SIGNAL). This is a GRAY wire with a BLACK STRIPE.

Then locate pin 18 (CMP SIGNAL). This is a TAN wire with a YELLOW STRIPE.

This is where things get stupid simple. Simply take Pins 8 and 18 of the Jeep ECM and connect them directly to pin 10 in the GM ECM. Congratulations, you now have a working Tachometer without the need for expensive converters / emulator boxes.

(Drops Mic) 🎤Ē
10-21-2019 07:45 AM
feva4u
Quote:
Originally Posted by AHenry014 View Post
After conducting a TON of research into the subject, i went with the Novak emulator. You have three options:
1. Novak Module, 200 bucks i believe. If you go this route, make sure to ask Novak for instructions on how to program the PCM for their module.
2. Redline gauges. They disassemble your cluster and put "standard" tach guts in there. I was quoted something like 400 for that. This eliminates the need for an emulator.
3. Custom gauge set, autometer or the like, most expensive and obviously deletes the factory cluster.
You forgot the Pre-millennial Pirate4x4 option of shifting when you hit the rev limiter and not worrying about what RPM your at.
10-21-2019 07:39 AM
AHenry014
Quote:
Originally Posted by motorsports3 View Post
Has anyone managed to get the stock tach to work on a TJ without an emulators, or has anyone built their own emulator? Some guy on Facebook claims to have done it, but I canít get the results to duplicate. Iíd rather not have to use an emulator if possible, and Iíd rather not have to buy one.
After conducting a TON of research into the subject, i went with the Novak emulator. You have three options:
1. Novak Module, 200 bucks i believe. If you go this route, make sure to ask Novak for instructions on how to program the PCM for their module.
2. Redline gauges. They disassemble your cluster and put "standard" tach guts in there. I was quoted something like 400 for that. This eliminates the need for an emulator.
3. Custom gauge set, autometer or the like, most expensive and obviously deletes the factory cluster.
10-20-2019 11:16 PM
motorsports3 Has anyone managed to get the stock tach to work on a TJ without an emulators, or has anyone built their own emulator? Some guy on Facebook claims to have done it, but I canít get the results to duplicate. Iíd rather not have to use an emulator if possible, and Iíd rather not have to buy one.
10-15-2019 04:28 PM
HankScorpi0
Quote:
Originally Posted by Cool Hand Luke View Post
I would have to modify my exhaust to accomodate a 2nd o2 sensor "upstream", run another $100 into o2 sensors, and spend $600 for a tune/dyno session locally. I'm $700 into this which is nearly the cost of the Holly setup which is self tuning, provides gauges (I don't have any wired up yet), and can make custom changes on the fly. Then when I start building the motor, or adding forced induction, I need another tune. Just want to get it running good before I start dialing stuff in.. Is there any flaws in my thinking?
Yeah you don't need holly efi. The stock pcm can do it all I have a buddy who went the holly route in his ls swapped Malibu it's still a big learning curve for tuning.
10-15-2019 02:05 PM
AHenry014
Quote:
Originally Posted by Cool Hand Luke View Post
I would have to modify my exhaust, run another $100 into o2 sensors, and spend $600 for a tune/dyno session locally. I'm $700 into this which is nearly the cost of the Holly setup. Then when I start building the motor, or adding forced induction, I need another tune. Just want to get it running good before I start dialing stuff in..
How is it currently tuned? If youre on the factory PCM with VATS removed, i would check the codes to see what its looking for. It will tell you if they eliminated the rear o2 sensors or not. Yes, youll need to buy two sensors (or grab a used pair from a part out) but its an easy mod to get it running as intended for the time being.

If your end goal is to get to the holley setup, youll need at least one side with an o2 bung (or after it Y's) anyhow. It utilizes a wideband o2 for self tuning.

EDIT: how are you controlling fuel pressure? Do you have a MAF?
10-15-2019 01:46 PM
Cool Hand Luke
Quote:
Originally Posted by HankScorpi0 View Post
The holly setup is ok but you can get her running a lot cheaper by getting 02 sensors right after the stock manifolds. Just get a tune to eliminate rear 02 post cat
I would have to modify my exhaust to accomodate a 2nd o2 sensor "upstream", run another $100 into o2 sensors, and spend $600 for a tune/dyno session locally. I'm $700 into this which is nearly the cost of the Holly setup which is self tuning, provides gauges (I don't have any wired up yet), and can make custom changes on the fly. Then when I start building the motor, or adding forced induction, I need another tune. Just want to get it running good before I start dialing stuff in.. Is there any flaws in my thinking?
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