Looking for Oem Eprom

[fivetodrive]

Re: Looking for Oem Eprom

My spare is an aybm but still a good chip. And I pulled the bin a long time ago but didn't check...

 

[MyTy]

Re: Looking for Oem Eprom

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This is my first time inserting an image so if i mess up my bad.. i pulled out my ecu and than took out from what i understand is the Eprom.. my question is to replace the KB chip i would be replacing the chip on the left correct?

 

[dgoodhue]

Re: Looking for Oem Eprom

You usually replace the the whole blue and black carrier (memcal).

You could solder in a new chip but almost no one does that and the replacement 128k and 256k sized chips are hard to find.

You can find some who can burn a new bin onto the chip onto your KB memcal.

You could buy a moates adapter that would use that memcal to piggy back to and run a new chip or emulator.

Or you could buy a chip like turbotweak that you would piggyback that memcal to.

Personally if you do use KB memcal for its esc circuitry, I would check to make sure the spark retard function is working properly through data logging. IMO it's not worth losing an engine over a memcal.

 

[MyTy]

Re: Looking for Oem Eprom

Personally if you do use KB memcal for its esc circuitry, I would check to make sure the spark retard function is working properly through data logging. IMO it's not worth losing an engine over a memcal.[/QUOTE]

When I run DataMaster there is no spark retard count wich i thought was a lil strange but I'm still learning how to use and understand the program. I'm new to data logging...

Since its not working do you know what that might mean...

 

[dgoodhue]

Re: Looking for Oem Eprom

When I run DataMaster there is no spark retard count wich i thought was a lil strange but I'm still learning how to use and understand the program. I'm new to data logging...

Since its not working do you know what that might mean...

The Kenne Bell chips disabled the ECM ability to pull timing when experiencing detonation, so that isn't expected. Why they disabled the knock retard in an engine that has heads that aren't detonation resistant is beyond me. It's why they are a poorly designed chip and why you see a highly frequency of rebuilt engine on truck that used KB chips.

 

[dgoodhue]

Re: Looking for Oem Eprom

I further researched the ESC, I found a post (thridgen.org-DIY PROM) where a member thought the ESC numbers deciphered to ESC type or batch, engine type, year, and 3 digit day of year. The ESC number that are posted don't exactly fit that description. One would expect to see a Z as the second digit using that code and the number also has an extra digit. Their may be an explanation for extra digit/different engine code. The Option code Z that SyTy have is the same engine code that regular S/T series 4.3 have as well. SyTy's use a different ECM (749) than the LB4 4.3 S/T series, so perhaps GM used a different number to further differentiate the memcals.

In looking at the AYBM picture, if that is Sy #1084 original memcal it would fall into date code range for the production date of that truck. 114 1 (1991) 037th day of the year (regular sequenced VIN Sylone's were manufactured Jan-June of 1991). It seems like Aaron and the OP KB chips would have the correct ESC circuit calibration for SyTy knock sensor.

Perhaps Brian misdiagnosed the KB memcal ESC calibration issue or maybe KB did a batch with a different memcals. In looking the numbers posted the KB memcals post in this thread, I would conclude that the ESC seem to have the correct calibration.

 

[SEL777]

Re: Looking for Oem Eprom

Your other thread show you have upgraded injectors, may not run right if you replace with a stock chip.

 

[MyTy]

Re: Looking for Oem Eprom

Your other thread show you have upgraded injectors, may not run right if you replace with a stock chip.

At the moment I have 30lb red top.. I pulled out the 40lb a few months ago to see if it helped the issue.. helped a lil but still running very rich.. Thanks for the heads up :tup::tup:

 

[MyTy]

Re: Looking for Oem Eprom

The Kenne Bell chips disabled the ECM ability to pull timing when experiencing detonation, so that isn't expected. Why they disabled the knock retard in an engine that has heads that aren't detonation resistant is beyond me. It's why they are a poorly designed chip and why you see a highly frequency of rebuilt engine on truck that used KB chips.

Do you think this might be why the previous owner snipped the knock sensor wire? I found that strange so I fixed it and seems things did kinda get worse after that.. also there was a orange wire close by the knock sensor that looked to have been accidently cut somehow.. I fixed that one also when I fixed the knock sensor wire.. Any ideas on what that orange wire lead to??

 

[dgoodhue]

Re: Looking for Oem Eprom

At the moment I have 30lb red top.. I pulled out the 40lb a few months ago to see if it helped the issue.. helped a lil but still running very rich.. Thanks for the heads up :tup::tup:

The injectors need to match what the chip is programmed for.

 

[MyTy]

Re: Looking for Oem Eprom

Still having problems!! So I purchased a stock eprom and no luck there. awhe back I purchased a ac delco fuel pump of eBay and after the install the truck only had a lil over 20lbs fuel presure. I was told the fuel pump was most likly wrong so I went through the headache of installing my old fuel pump back in and my fuel pressure went back to around 42 lbs of pressure at idle but when I give it gas the pressure drops to about 20lbs and the truck bogs out and I can't accelerate quickly at all.. I do suspect the cat needs replacement but I'm curious can a bad cat convertor make you loose fuel pressure apon acceleration?

 

[MyTy]

Re: Looking for Oem Eprom

So I'm about as happy as Ralphie on Christmas morning! I had to search through google to find a thread on here that was similar to my issue.. It was my fuel pressure that was all out of whack.. a while back a mechanic lowered my fuel pressure down real low to try and get it to stop running so rich.. that got no where so I recently tried adjusting the pressure back to normal and things got even worse.. I couldn't accelerate at all, it would cut out and not go passed 3k rpm.. well where I went wrong and I think the mechanic and previous owner also went wrong was not only making sure the vacuum line was disconnected from the AFPR but also making sure the vacuum line was plugged closed while adjusting the fuel pressure.

I know things still need adjusting like the Timing/Fuel Pressure/Boost. I didn't hook it up to DataMaster yet cause I was tired from working on it and also so excited that I could give it gas and accelerate .

Tonight was the first time since me owning the truck for about a year now that I got to actually feel the power! The first time the turbo kicked in it literally kick my head back.. The ty has a mild build but I'm surprised how well it ran tonite with stock injectors and stock eprom.. My next goal for now is to see if it will pass DEQ I think I might even lower the FP a bit more before taking it in and also adjust the timing..

THANK YOU so much to everyone who took the time to help my noobie bumbum!!!