Mark305TBI

I've been working on getting my car tuned for quite some time now (a few months ). I've been systematically replacing components in hopes of a breakthrough. I've gone through a few junk yard 7747 ECUs before I bought a remanufactured one. No luck at all there. I finally went the other day to the Chevy dealership and bought a new PROM for a 7747, slapped it in and the car now runs (before it would drown the car with gobs of gas so it wouldn't start and light the SES). It does run a bit rich, but I think that it's from the BPW being at 135 rather than 112 (where it needs to be). Anyway, I come back inside, grab a blank chip, set the BPW to 112, write the .bin to the chip (it verifies both in the FILEPROM program as well as loading the image back into CATS and comparing). When I slap the chip in the ECU this time, it's more of the same, SES and WAY to much fuel. Anybody got any insight, something that I've missed? Do I need to contact Intronics about getting my programmer replaced/repaired?

-Mark W.
'88 SC Camaro w/ 305 TBI

Grumpy

Are you correcting the checksum?

Mark305TBI

Does TunerCATS not automatically adjust the checksum? If it doesn't, then I'm not.

-Mark W.
'88 SC Camaro w/ 305 TBI

TRAXION

Mark,

TC does correct the checksum. So, no need to worry about that.

I would do this:
Get the new GM chip and grab the BIN off of it. Burn one of your own chips with the GM bin that you JUST downloaded and then try your chip. It should run like the GM chip. If it doesn't then you'll know 100% for sure that the problem is on your end ... either your chips, your carrier, the way that you are burning your chips, the way you are editing BINS ... something.

Tim

------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

Blade

Hey Tim... is that new version of the AFR Modifier software out yet ?

Mark305TBI

The .BIN image that I've been using is one that I've downloaded off of the GMECM website, ASDU.BIN, it's the same broadcast code that's on the chip I bought. I'm kinda scared to risk messing the chip up putting it in the programmer since this is the closest it's come to running (and the chip cost me $75), maybe I'm just paranoid.

-Mark W.
'88 SC Camaro w/ 305 TBI

Grim Reaper

There is no risk to (your GM chip) to read the bin from your stock GM chip and using that to write onto the other eprom. As Traxion is suggesting, it WILL confirm if the other eprom is bad or just the BIN you got the web.

Just as a note, if you set your BLMs to 128 (min & max), you MIGHT trigger trigger an SES code if you are running overly rich or overly lean. You will get an O2 rich or lean condition. I accidentally got one when I was playing with the mixtures and went too rich. Just something to be aware of.

Mark305TBI

Today I wrote the same .BIN to all the blank chips I've got (like 7 or 8) and carried them all out to the car and started swapping them. They were all failures of varying degrees. Some flashed the SES light, the rest just lit it up, and none of them would start the car (the same old flooding problem). Then, just for ***** and giggles, I put the PROM that I bought from the dealership in there just to see and it did the same damn thing!! Lit the damn SES light and flooded the engine so that it wouldn't start. I disconnected the positive battery terminal before I removed/installed any of the chips, WTF!?!? This is the chip that just two days ago didn't light the SES light and actually started the car!! I'm about to the point of jumping off of a tall building (or at least pushing this car off of a tall cliff).

-Mark W.
'88 SC Camaro w/ 305 TBI

Mark305TBI

Just a minute ago, since it wasn't working anyway, I threw the chip that I bought in the programmer and compared it to the .BIN that I downloaded from the GMECM site. They came up the same.

-Mark W.
'88 SC Camaro w/ 305 TBI

Mark305TBI

Oh yeah, when I use my Auto X-Ray to scan it, it'll scan (the PROM id# is correct so it's actually reading the PROM) and it's not throwing any codes. Just in case anyone was wondering...

-Mark W.
'88 SC Camaro w/ 305 TBI