ok guys.........i have tried to burn my own chips.................paid butt load of cash for a custom chip........and still can't get it right.......here's the problem......my engine runs way too rich at idle and idles up and down......sometimes stalls ........i have adjusted the fuel pressure down and still can't get it right.......the chips i have tried to burn won't idle at all and the ses light stays on with a memcal problem..........the custom chip does the same thing that the stock chip does.......all i am running is a set of slp runners,bigger t/b and aftermarket heads with the gmpp lt4 hot cam............please someone khelp me

 

well i guess no one is gonna help me.

 

What are the BLM/INT values when you are idling and what MAP values are you getting?

Also, what is the SES code?

 

on stock chip and custom chip(one i bought)
BLM is 128 and map is 2.5 to 3.0 volts......

ses light stays on with chips i tried to burn,no communication
figured i haven't done it right......

the custom chip i got came from motorvation industries out of memphis

 

oh yeah,timing is set at 0 degrees and the fuel pressure is set at 45 psi and won't go any lower.........stock pump in tank and brand new bbk afpr........my tpis afpr did the same thing........it runs way too rich at idle and did this before i changed injectors

 

I need the MAP in kpa and you need to pull the SES codes off. You can get it from the ALDL connector by jumping the A-B connectors.

Also, have you modified the Injector Constant in the eprom to reflect the different injectors?

 

the injectors are just stock corvette lt1 injectors....figured nothing too fancy about them

 

sorry i'm not much of a help right now,but my var is at the shop and i'm here at home.....i think if i remeber last time i looked at the map it was around 30 kpa............i will let you know for sure tomorrow night.....i'll talke a look at it then

 

An important item to check for is the SES blink at key on. After the key has been off for at least 10 seconds, turn the key on, engine off, and watch the SES light. It should turn on, blink off, then come on solid.

If the blink off does not happen then the ECM is running in backup mode. And not from the actual chip calibration/software. This can happen from having a really bad burn or bin image on the chip, chip in backwards, bad ECM, bad MEMCAL, . . .

Have to get the SES blink before anything can be looked at.

RBob.

 

it stays on solid with my poorly or improperly burned chips.......i guess i don't have a good bin file or i'm just screwing things up......everything works with the other chips(stock and motorvation chip)just runs rich with these ....doesn't idle at all with the bad chips....i think i'm gonna look at the data on the cdustom chip and see what it's all about and try and copy some of those changes...........

 

Of course the SES light remains on. That just tells you had a problem. Next, you then need to read the code to find out why. You do this by jumping the A-B pins on the ALDL connector and recording the "flashes" as per RBob.

 

A misunderstanding, no need to jumper anything. At key on, engine off, a properly operating system (even with codes) the SES will blink off before it comes back on solid.

At key on the ECM goes through a reset process. At this time the SES will be on. During the reset the ECM will turn off the SES light and then start running the actual engine control code. At this point there aren't any DRP pulses (code 12) so the ECM turns on the SES, which is normal.

Only if the SES blink occurs is the ECM running the code. When at key on the SES turns on solid and never blinks, forget it, the ECM isn't running the code on the EPROM.

RBob.

 

If this problem ONLY comes with your "burned" eprom, it then is probably in the MEMCAL or eprom.

First, where did you get the Memcal? The Memcal MUST be from a SD V8 car. If you used a V6 Memcal you will get an SES code because you have the wrong circuitry on the eprom.

Also, if you didn't properly erase the eprom prior to burning, this too will throw a code and cause problems. Make sure you properly erased it AND you gradually add a little extra erasing time everytime you re-program it (I am assuming it is an eprom and not a FLASH Prom).

A simple test, re-burn your original BIN from your original memcal, ensure you give it a good erasing time and see if the problem goes away. If so, then it is either the programming or erasing. If the problem continues, the it's either the memcal is wrong or your eprom has seen better days.

 

ok,i got a chance to get the map values and such.....didn't really have time to jump the a and b pins,but this is what i got


map 66 kpa and 2.9 - 3.5 v
injector pulse 5.3 - 6.5
fuel integrator 128
block learn int 128
block learn cell 4


i'm using a gm tech 1 to read the data and all of this is from the motorvation chip........the stock memcal reads basically the same and it is for a 92 z/28 with the 5.7 ecm 730
so i know i have the right memcal......i'm gonna try and burn another chip later.i beleive its just a bad burn on them.......but anyways.......tahnks and anymore hel;p would be appreciated

 

Sorry but that is too little information and doesn't really mean much by itself. What are you trying to show? You don't specify the RPM, whether this was idle, part-throttle or WOT. Open loop or closed-loop? Hot or cold?

That info you gave would mean totally different things in each of the scenerios above.

 

oops.......sorry......its at idle........and cold...........basically no change at when hot,and it stays in open loop too long

 

whats sad is i can fix just about any car out there and can't even fix my own

 

Lock you BLM - Min/Max to 128 and drive around to get it warmed up to proper operating temp and in closed loop. Then tell me the above info with the rpm and INT value (the BLM will be 128). Then you can see what you should what direction and what cells you need to adjust for your idle.

 

You have the timing set to 0 degrees, with or without the EST Bypass wire connected for that? If that's with it connected, that'll cause similar problems. If it is still disconnected, it'll cause similar problems.

Also, the fuel pressure thing - at idle WITH vacuum connected to the regulator, what is the pressure? If this problem was there before, maybe you have a blocked return line. A stock regulator will have fuel pressure at about 41-44 with no vacuum and 35-38 with it, except if the MAP is at 66, it will still be a little higher.

Oh, you have GOT to read the SES code(s) too. It could be something stupidly easy.