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#1033971 - 01/05/16 03:17 AM Customized ZZ4 EPROMs for sale  
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Bitflipper Offline
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I have a number of customized ZZ4 EPROMs for sale. These EPROMs can only be used in ECM model number 1228079 - if you have an '87 or '88 Monte Carlo SS with the stock computer then this is the ECM that you have. Earlier model years require you to swap out your ECM for a 1228079. I am NOT selling any ECMs as they are readily available on ebay and from other members.

Note that the EPROMs I am selling are modified from the stock ZZ4 parameters in the following ways:

- The spark advance that is added when an ALDL diagnostic cable/scanner is plugged in is deleted in these EPROMs. That means your car will behave the same way regardless of whether or not you have a scanner plugged in.

- The Air Diverter is programmed to use RPM in the stock ZZ4 parameters whereas the L69 chip uses the VSS. I put the Air Diverter control back to using VSS in these EPROMs as I find that the car drives better this way when coasting downhill in low gear. This change makes no difference if the Air Diverter is deleted as there is no feedback from or trouble code related to the Air Diverter.

- The ZZ4 parameters delete the Baro sensor. Since the Monte Carlo SS has a Baro sensor, I re-enabled it for what it's worth.

- The stock ZZ4 deletes the EGR functionality entirely. I re-enabled the EGR functionality in these EPROMs. This means that you can still run your EGR if you so choose, but if it is deleted, the vacuum line for the EGR MUST be blocked off or a nasty vacuum leak will ensue. Note that the EGR trouble code 53 remains DELETED in these EPROMs, only the potential functionality of the EGR is re-enabled. Said a different way, regardless of the state of the EGR, the SES light will never come up with code 53, not after 20 minutes of highway driving, not ever.

Please note - any mention of deleted emissions equipment above is not a recommendation. In fact, it may be illegal to delete these parts in your state/province.

Price for one EPROM is $65 USD shipped in the US ($70 to Canada). If you want an EPROM with one or more of the customizations listed above changed back to the ZZ4 defaults then the price for one personalized EPROM is $85 shipped in the US ($90 to Canada). If you want anything else personalized (eg. other trouble codes deleted) then you can write me to inquire as to whether it can be done and at what price.

I do not know how long I will be able to offer these EPROMs for sale as there are only a limited number of EPROMs of this vintage readily available, and demands on my time may change. For the time being, if you want one of these EPROMs, PM me and I will send you my PayPal address.


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#1033993 - 01/06/16 01:35 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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tomh115 Offline
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I'm interested in the modified eprom as described and discussed in the forum post. Sending a pm to request payment info.


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1987 Monte Carlo SS Aerocoupe
Objects in mirror are losing
https://www.flickr.com/gp/34317731@N08/3xk4xk
#1034807 - 02/02/16 04:37 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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I will be testing this in my 83 using an 86/87 ECM and custom chip.

I have 2 ECM's, 1 from an SS and the other is none SS but the correct part #.

Last edited by oemtech; 02/02/16 04:40 AM.

Dale (AKA - Oemtech - Oemy)
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83 Monte Carlo SS
My Monte Carlo SS Web Site
#1034863 - 02/04/16 02:03 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Pa85ss Offline
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I received mine. Its working good
Thanks

#1035893 - 03/04/16 08:34 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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Installed the 87/88 ECM with the custom chip in my 83 and starts, runs and no codes. Will do more testing in the next week or so. IE - remove EGR.

Last edited by oemtech; 03/05/16 12:50 AM.

Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1035894 - 03/04/16 09:35 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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That rocks, thanks for the update Dale. That's an 87/88 ECM, you're using there, '86 was different.

Anyone with an early model year SS that does not have a knock sensor (no-ESC, no Electronic Spark Control, however you want to say it) can now buy a custom ZZ4 EPROM from me if you like. Just make sure I know it's the no-ESC one that you need.


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#1035902 - 03/05/16 12:59 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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OBTW - I have a 2nd 87/88 ECM and a spare ZZ4 chip.


Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1036706 - 03/23/16 05:20 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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For any early model year forth gen Monte Carlo SS members who might have been concerned about whether or not they have an ESC and if they can use the 1228079 ECM with a ZZ4 chip - today it was proven that ALL forth gen Monte Carlo SS's were installed with a knock sensor and ESC. More info here:

ZZ4 Prom Chip?

All Monte Carlo SS model years 1983-1988 can use the customized ZZ4 chip I have created (or stock chip, or stock ZZ4 chip). 1983-1986 need to acquire a 1228079 ECM to put the chip in and swap the ECM.

Thanks to member oemtech for helping me prove this out for certain.


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#1038154 - 04/21/16 11:38 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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I installed the updated ZZ4 chip with ESC and it runs great.

I have a 2nd 87/88 ECM & bitflipper sent 2nd ZZ4 chip. Went to install the chip & the orientation was 180 degrees out from the one I have in my 83. When I have some time I will swap ECM's to test.


Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1038755 - 05/06/16 11:26 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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ProjectMonte Offline
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It looks like it has been a few months since this was posted, but I am curious if you still have any of these EPROMs for sale.

#1038768 - 05/06/16 03:11 PM Re: Customized ZZ4 EPROMs for sale [Re: ProjectMonte]  
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Bitflipper Offline
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I have a few burned and ready to go. I'll send you a PM.


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#1044309 - 10/12/16 04:50 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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This may not be the best timing for this because many of you guys are probably preparing to winterize your car but it's out of my hands:

I will soon be relocating to once again take up full time work in an intense info tech position. There is a good chance I will have to cease offering these ZZ4/L69 hybrid EPROMs for sale.

Today I bought out the last of the TMS2532JL EPROMs here in the SF Bay Area where I imagine some long gone silicon valley technology company liquidated them to the surplus store in San Jose, CA. So regardless of demands of my new position, once those are gone, I'm likely completely shutting down production of these EPROMs because they are simply too difficult to find at a reasonable price.

If you are interested in one of these EPROMs I would suggest you contact me soon as I may disappear indefinitely before too long.

In any case, please read the first post in this thread and understand what it is that I am offering for sale and what the minimum ECM requirements are to use the ZZ4/L69 hybrid EPROM.


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#1053241 - 09/06/17 03:49 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Marino Offline
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Newmarket
Hi Bitflipper Can you modified Hypertech Chip Stage2 chip! Let me know thanks?

#1053245 - 09/06/17 11:15 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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Only if the chip is meant for the 1987/1988 Monte Carlo SS ECM - model # 1228079. I don't have the source code (nor does anyone AFAIK) for any of the other ECM model years so it's impossible to know what the chip parameters are for anything other than 1228079.

What do you want done to it?


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#1053591 - 09/25/17 05:52 PM Re: Customized ZZ4 EPROMs for sale [Re: tomh115]  
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Marino Offline
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Can you burn Hypertech stage 2 chip and delete EGR code 53!

#1053599 - 09/25/17 08:14 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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Again, I have to ask you what ECM you have that Hypertech Stage 2 chip in. You need to pull your ECM out of the harness and tell me the numbers on the white sticker that is on the ECM housing. If it matches the 1987/1988 Monte Carlo SS ECM then yes, I would be able to do it. Otherwise no. If it's a match then you would need to send me the chip for about a week so I have time to read/modify/burn to a new EPROM.


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#1054442 - 11/16/17 03:13 AM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Marino Offline
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How can I trust you that will ship it back to me and I am originally owner of 87 SS and right now original ecm chip in it and can you ship one and I will ship you and when I receive it

#1054443 - 11/16/17 03:35 AM Re: Customized ZZ4 EPROMs for sale [Re: Marino]  
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oemtech Offline
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Originally Posted by Marino
How can I trust you that will ship it back to me and I am originally owner of 87 SS and right now original ecm chip in it and can you ship one and I will ship you and when I receive it


Do what I did get a 2nd ECM.. I may even have one at the shop. I will check and get back to you.


Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1054444 - 11/16/17 03:49 AM Re: Customized ZZ4 EPROMs for sale [Re: Marino]  
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tomh115 Offline
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Russellville, AR
He is very trustworthy. He did a lot of a favor with these custom EPROM chips and I'll vouch for him. Top notch guy (I'm sure other members would do the same). Chip works great.


[Linked Image]
1987 Monte Carlo SS Aerocoupe
Objects in mirror are losing
https://www.flickr.com/gp/34317731@N08/3xk4xk
#1054448 - 11/16/17 03:18 PM Re: Customized ZZ4 EPROMs for sale [Re: tomh115]  
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Marino Offline
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If I ship out mine and how much do you charge. I live in Ontario, Canada! It shouldn't be a problem! Do you need to remove EGR or block plate it!

#1054449 - 11/16/17 04:00 PM Re: Customized ZZ4 EPROMs for sale [Re: Marino]  
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oemtech Offline
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Originally Posted by Marino
If I ship out mine and how much do you charge. I live in Ontario, Canada! It shouldn't be a problem! Do you need to remove EGR or block plate it!


You don't need to ship anything... You just need a compatible ecm and a new chip.


Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1054450 - 11/16/17 05:11 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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Bitflipper Offline
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Marino is kind of all over the map. He originally asked if I could delete the EGR code from a "Hypertech Chip Stage2" but I never heard of such an animal for the 1228079 ECM. Now he says he's using the original L69 chip. He's asking questions as to whether or not he can trust me. For the very marginal amount of money I get out of working with these chips, I don't trust him not to smear my name because he doesn't understand what he's working with. Were it in fact a unique chip intended for the 1228079 ECM, I would have done it just for the curiosity factor of seeing how it differs from L69 or ZZ4. Doesn't seem worth it now.


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#1054455 - 11/16/17 09:53 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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Just got back from the shop.....

1 have 1 ECM 1228079 ECM with a Bittflipper ZZ4 mod chip sitting on my desk.
$175 shipped to Canada or $150 shipped lower 48.

Bittflipper - I have a eprom you might be able to use
front - 2532JL-45 MEP8319 Back - M2532/02866
Yours free if you want it.

Last edited by oemtech; 11/17/17 01:35 AM.

Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
#1054462 - 11/17/17 01:12 PM Re: Customized ZZ4 EPROMs for sale [Re: oemtech]  
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Marino Offline
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Hi' Sorry for all confusion, i do have the original ECM chip that is in and functional, i also purchased 20yrs go Hypertech stage2 chip and which i remove and i didn't notice any difference, and i was asking if Hypertech can be modified! i know original can be burn! What can you do for me

#1054465 - 11/17/17 02:29 PM Re: Customized ZZ4 EPROMs for sale [Re: Bitflipper]  
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oemtech Offline
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Considering that you said there was no difference in stock and the Hypertech chip I wouldn't even mess with modding the Hypertech chip. The gains wouldn't be worth the effort. The modified ZZ4 chip worked as designed for what I wanted. My goal was to swap out the stock GM manafold, install an Edlebrock 3701 manifold and block off the EGR port. But, this allowed me to put the stock chip back in and reinstall the EGR if I sold the car. With the ZZ4 chip mod I could leave the stock manifold on and remove the the EGR. IE - best of both.

Just what are looking for from a chip change?


Dale (AKA - Oemtech - Oemy)
[Linked Image]
83 Monte Carlo SS
My Monte Carlo SS Web Site
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